diff --git a/.changeset/five-ants-watch.md b/.changeset/five-ants-watch.md
new file mode 100644
index 0000000000..02bdc3d584
--- /dev/null
+++ b/.changeset/five-ants-watch.md
@@ -0,0 +1,5 @@
+---
+"llamaindex": minor
+---
+
+Unify chat engine response and agent response
diff --git a/examples/agent/openai.ts b/examples/agent/openai.ts
index 67d0d4b556..a0780b7c7e 100644
--- a/examples/agent/openai.ts
+++ b/examples/agent/openai.ts
@@ -53,7 +53,7 @@ async function main() {
     message: "How much is 5 + 5? then divide by 2",
   });
 
-  console.log(response.response.message);
+  console.log(response.message);
 }
 
 void main().then(() => {
diff --git a/examples/agent/react_agent.ts b/examples/agent/react_agent.ts
index 764f17feae..bb094237f3 100644
--- a/examples/agent/react_agent.ts
+++ b/examples/agent/react_agent.ts
@@ -68,7 +68,7 @@ async function main() {
   });
 
   // Chat with the agent
-  const { response } = await agent.chat({
+  const response = await agent.chat({
     message: "Divide 16 by 2 then add 20",
   });
 
diff --git a/examples/agent/step_wise_query_tool.ts b/examples/agent/step_wise_query_tool.ts
index 92a5ebe0f2..829d35f26e 100644
--- a/examples/agent/step_wise_query_tool.ts
+++ b/examples/agent/step_wise_query_tool.ts
@@ -31,7 +31,7 @@ async function main() {
     tools: [queryEngineTool],
   });
 
-  const { response } = await agent.chat({
+  const response = await agent.chat({
     message: "What was his salary?",
   });
 
diff --git a/examples/agent/stream_openai_agent.ts b/examples/agent/stream_openai_agent.ts
index 111853fba8..4d8d6e8fcb 100644
--- a/examples/agent/stream_openai_agent.ts
+++ b/examples/agent/stream_openai_agent.ts
@@ -68,9 +68,7 @@ async function main() {
 
   console.log("Response:");
 
-  for await (const {
-    response: { delta },
-  } of stream) {
+  for await (const { delta } of stream) {
     process.stdout.write(delta);
   }
 }
diff --git a/examples/agent/wiki.ts b/examples/agent/wiki.ts
index 379c6cdacd..e4100e9909 100644
--- a/examples/agent/wiki.ts
+++ b/examples/agent/wiki.ts
@@ -16,9 +16,7 @@ async function main() {
     stream: true,
   });
 
-  for await (const {
-    response: { delta },
-  } of response) {
+  for await (const { delta } of response) {
     process.stdout.write(delta);
   }
 }
diff --git a/packages/core/e2e/examples/cloudflare-worker-agent/src/index.ts b/packages/core/e2e/examples/cloudflare-worker-agent/src/index.ts
index eeb45a3fa5..d96fe9d745 100644
--- a/packages/core/e2e/examples/cloudflare-worker-agent/src/index.ts
+++ b/packages/core/e2e/examples/cloudflare-worker-agent/src/index.ts
@@ -21,7 +21,7 @@ export default {
       // @ts-expect-error: see https://github.com/cloudflare/workerd/issues/2067
       new TransformStream({
         transform: (chunk, controller) => {
-          controller.enqueue(textEncoder.encode(chunk.response.delta));
+          controller.enqueue(textEncoder.encode(chunk.delta));
         },
       }),
     );
diff --git a/packages/core/e2e/examples/nextjs-agent/src/actions/index.tsx b/packages/core/e2e/examples/nextjs-agent/src/actions/index.tsx
index 8aa6b12f9d..b092fd0b89 100644
--- a/packages/core/e2e/examples/nextjs-agent/src/actions/index.tsx
+++ b/packages/core/e2e/examples/nextjs-agent/src/actions/index.tsx
@@ -23,7 +23,7 @@ export async function chatWithAgent(
           uiStream.update("response:");
         },
         write: async (message) => {
-          uiStream.append(message.response.delta);
+          uiStream.append(message.delta);
         },
       }),
     )
diff --git a/packages/core/e2e/node/claude.e2e.ts b/packages/core/e2e/node/claude.e2e.ts
index faa96cd735..c8fde2d908 100644
--- a/packages/core/e2e/node/claude.e2e.ts
+++ b/packages/core/e2e/node/claude.e2e.ts
@@ -2,7 +2,7 @@ import { consola } from "consola";
 import { Anthropic, FunctionTool, Settings, type LLM } from "llamaindex";
 import { AnthropicAgent } from "llamaindex/agent/anthropic";
 import { extractText } from "llamaindex/llm/utils";
-import { ok, strictEqual } from "node:assert";
+import { ok } from "node:assert";
 import { beforeEach, test } from "node:test";
 import { getWeatherTool, sumNumbersTool } from "./fixtures/tools.js";
 import { mockLLMEvent } from "./utils.js";
@@ -71,12 +71,11 @@ await test("anthropic agent", async (t) => {
         },
       ],
     });
-    const { response, sources } = await agent.chat({
+    const response = await agent.chat({
       message: "What is the weather in San Francisco?",
     });
     consola.debug("response:", response.message.content);
 
-    strictEqual(sources.length, 1);
     ok(extractText(response.message.content).includes("35"));
   });
 
@@ -110,7 +109,7 @@ await test("anthropic agent", async (t) => {
     const agent = new AnthropicAgent({
       tools: [showUniqueId],
     });
-    const { response } = await agent.chat({
+    const response = await agent.chat({
       message: "My name is Alex Yang. What is my unique id?",
     });
     consola.debug("response:", response.message.content);
@@ -122,7 +121,7 @@ await test("anthropic agent", async (t) => {
       tools: [sumNumbersTool],
     });
 
-    const { response } = await anthropicAgent.chat({
+    const response = await anthropicAgent.chat({
       message: "how much is 1 + 1?",
     });
 
@@ -137,35 +136,35 @@ await test("anthropic agent with multiple chat", async (t) => {
       tools: [getWeatherTool],
     });
     {
-      const { response } = await agent.chat({
+      const response = await agent.chat({
         message: 'Hello? Response to me "Yes"',
       });
       consola.debug("response:", response.message.content);
       ok(extractText(response.message.content).includes("Yes"));
     }
     {
-      const { response } = await agent.chat({
+      const response = await agent.chat({
         message: 'Hello? Response to me "No"',
       });
       consola.debug("response:", response.message.content);
       ok(extractText(response.message.content).includes("No"));
     }
     {
-      const { response } = await agent.chat({
+      const response = await agent.chat({
         message: 'Hello? Response to me "Maybe"',
       });
       consola.debug("response:", response.message.content);
       ok(extractText(response.message.content).includes("Maybe"));
     }
     {
-      const { response } = await agent.chat({
+      const response = await agent.chat({
         message: "What is the weather in San Francisco?",
       });
       consola.debug("response:", response.message.content);
       ok(extractText(response.message.content).includes("72"));
     }
     {
-      const { response } = await agent.chat({
+      const response = await agent.chat({
         message: "What is the weather in Shanghai?",
       });
       consola.debug("response:", response.message.content);
diff --git a/packages/core/e2e/node/openai.e2e.ts b/packages/core/e2e/node/openai.e2e.ts
index e9bfceb587..6545846740 100644
--- a/packages/core/e2e/node/openai.e2e.ts
+++ b/packages/core/e2e/node/openai.e2e.ts
@@ -13,7 +13,6 @@ import {
   SummaryIndex,
   VectorStoreIndex,
   type LLM,
-  type ToolOutput,
 } from "llamaindex";
 import { extractText } from "llamaindex/llm/utils";
 import { ok, strictEqual } from "node:assert";
@@ -93,7 +92,7 @@ await test("gpt-4-turbo", async (t) => {
         },
       ],
     });
-    const { response } = await agent.chat({
+    const response = await agent.chat({
       message: "What is the weather in San Jose?",
     });
     consola.debug("response:", response.message.content);
@@ -109,7 +108,7 @@ await test("agent system prompt", async (t) => {
       systemPrompt:
         "You are a pirate. You MUST speak every words staring with a 'Arhgs'",
     });
-    const { response } = await agent.chat({
+    const response = await agent.chat({
       message: "What is the weather in San Francisco?",
     });
     consola.debug("response:", response.message.content);
@@ -187,7 +186,7 @@ For questions about more specific sections, please use the vector_tool.`,
   });
 
   strictEqual(mockCall.mock.callCount(), 0);
-  const { response } = await agent.chat({
+  const response = await agent.chat({
     message:
       "What's the summary of Alex? Does he live in Brazil based on the brief information? Return yes or no.",
   });
@@ -224,12 +223,11 @@ await test("agent with object function call", async (t) => {
         ),
       ],
     });
-    const { response, sources } = await agent.chat({
+    const response = await agent.chat({
       message: "What is the weather in San Francisco?",
     });
     consola.debug("response:", response.message.content);
 
-    strictEqual(sources.length, 1);
     ok(extractText(response.message.content).includes("72"));
   });
 });
@@ -257,12 +255,11 @@ await test("agent", async (t) => {
         },
       ],
     });
-    const { response, sources } = await agent.chat({
+    const response = await agent.chat({
       message: "What is the weather in San Francisco?",
     });
     consola.debug("response:", response.message.content);
 
-    strictEqual(sources.length, 1);
     ok(extractText(response.message.content).includes("35"));
   });
 
@@ -296,10 +293,9 @@ await test("agent", async (t) => {
     const agent = new OpenAIAgent({
       tools: [showUniqueId],
     });
-    const { response, sources } = await agent.chat({
+    const response = await agent.chat({
       message: "My name is Alex Yang. What is my unique id?",
     });
-    strictEqual(sources.length, 1);
     ok(extractText(response.message.content).includes(uniqueId));
   });
 
@@ -308,11 +304,10 @@ await test("agent", async (t) => {
       tools: [sumNumbersTool],
     });
 
-    const { response, sources } = await openaiAgent.chat({
+    const response = await openaiAgent.chat({
       message: "how much is 1 + 1?",
     });
 
-    strictEqual(sources.length, 1);
     ok(extractText(response.message.content).includes("2"));
   });
 });
@@ -333,15 +328,12 @@ await test("agent stream", async (t) => {
     });
 
     let message = "";
-    let soruces: ToolOutput[] = [];
 
-    for await (const { response, sources: _sources } of stream) {
+    for await (const response of stream) {
       message += response.delta;
-      soruces = _sources;
     }
 
     strictEqual(fn.mock.callCount(), 2);
-    strictEqual(soruces.length, 2);
     ok(message.includes("28"));
     Settings.callbackManager.off("llm-tool-call", fn);
   });
diff --git a/packages/core/e2e/node/react.e2e.ts b/packages/core/e2e/node/react.e2e.ts
index 54626cd205..f500e2041d 100644
--- a/packages/core/e2e/node/react.e2e.ts
+++ b/packages/core/e2e/node/react.e2e.ts
@@ -19,7 +19,7 @@ await test("react agent", async (t) => {
     const agent = new ReActAgent({
       tools: [getWeatherTool],
     });
-    const { response } = await agent.chat({
+    const response = await agent.chat({
       stream: false,
       message: "What is the weather like in San Francisco?",
     });
@@ -41,7 +41,7 @@ await test("react agent stream", async (t) => {
     });
 
     let content = "";
-    for await (const { response } of stream) {
+    for await (const response of stream) {
       content += response.delta;
     }
     ok(content.includes("72"));
diff --git a/packages/core/src/EngineResponse.ts b/packages/core/src/EngineResponse.ts
new file mode 100644
index 0000000000..8cfa9d195a
--- /dev/null
+++ b/packages/core/src/EngineResponse.ts
@@ -0,0 +1,90 @@
+import type { NodeWithScore } from "./Node.js";
+import type {
+  ChatMessage,
+  ChatResponse,
+  ChatResponseChunk,
+} from "./llm/types.js";
+import { extractText } from "./llm/utils.js";
+
+export class EngineResponse implements ChatResponse, ChatResponseChunk {
+  sourceNodes?: NodeWithScore[];
+
+  metadata: Record<string, unknown> = {};
+
+  message: ChatMessage;
+  raw: object | null;
+
+  #stream: boolean;
+
+  private constructor(
+    chatResponse: ChatResponse,
+    stream: boolean,
+    sourceNodes?: NodeWithScore[],
+  ) {
+    this.message = chatResponse.message;
+    this.raw = chatResponse.raw;
+    this.sourceNodes = sourceNodes;
+    this.#stream = stream;
+  }
+
+  static fromResponse(
+    response: string,
+    stream: boolean,
+    sourceNodes?: NodeWithScore[],
+  ): EngineResponse {
+    return new EngineResponse(
+      EngineResponse.toChatResponse(response),
+      stream,
+      sourceNodes,
+    );
+  }
+
+  private static toChatResponse(
+    response: string,
+    raw: object | null = null,
+  ): ChatResponse {
+    return {
+      message: {
+        content: response,
+        role: "assistant",
+      },
+      raw,
+    };
+  }
+
+  static fromChatResponse(
+    chatResponse: ChatResponse,
+    sourceNodes?: NodeWithScore[],
+  ): EngineResponse {
+    return new EngineResponse(chatResponse, false, sourceNodes);
+  }
+
+  static fromChatResponseChunk(
+    chunk: ChatResponseChunk,
+    sourceNodes?: NodeWithScore[],
+  ): EngineResponse {
+    return new EngineResponse(
+      this.toChatResponse(chunk.delta, chunk.raw),
+      true,
+      sourceNodes,
+    );
+  }
+
+  // @deprecated use 'message' instead
+  get response(): string {
+    return extractText(this.message.content);
+  }
+
+  get delta(): string {
+    if (!this.#stream) {
+      console.warn(
+        "delta is only available for streaming responses. Consider using 'message' instead.",
+      );
+    }
+    return extractText(this.message.content);
+  }
+
+  toString() {
+    return this.response ?? "";
+  }
+}
diff --git a/packages/core/src/Response.ts b/packages/core/src/Response.ts
deleted file mode 100644
index c922173d2e..0000000000
--- a/packages/core/src/Response.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import type { NodeWithScore } from "./Node.js";
-
-/**
- * Response is the output of a LLM
- */
-export class Response {
-  response: string;
-  sourceNodes?: NodeWithScore[];
-  metadata: Record<string, unknown> = {};
-
-  constructor(response: string, sourceNodes?: NodeWithScore[]) {
-    this.response = response;
-    this.sourceNodes = sourceNodes || [];
-  }
-
-  protected _getFormattedSources() {
-    throw new Error("Not implemented yet");
-  }
-
-  toString() {
-    return this.response ?? "";
-  }
-}
diff --git a/packages/core/src/agent/anthropic.ts b/packages/core/src/agent/anthropic.ts
index ac415b6e9c..1f917cf3ea 100644
--- a/packages/core/src/agent/anthropic.ts
+++ b/packages/core/src/agent/anthropic.ts
@@ -1,3 +1,4 @@
+import { EngineResponse } from "../EngineResponse.js";
 import { Settings } from "../Settings.js";
 import {
   type ChatEngineParamsNonStreaming,
@@ -5,15 +6,9 @@ import {
 } from "../engines/chat/index.js";
 import { stringifyJSONToMessageContent } from "../internal/utils.js";
 import { Anthropic } from "../llm/anthropic.js";
-import type { ToolCallLLMMessageOptions } from "../llm/index.js";
 import { ObjectRetriever } from "../objects/index.js";
 import type { BaseToolWithCall } from "../types.js";
-import {
-  AgentRunner,
-  AgentWorker,
-  type AgentChatResponse,
-  type AgentParamsBase,
-} from "./base.js";
+import { AgentRunner, AgentWorker, type AgentParamsBase } from "./base.js";
 import type { TaskHandler } from "./types.js";
 import { callTool } from "./utils.js";
 
@@ -56,9 +51,7 @@ export class AnthropicAgent extends AgentRunner<Anthropic> {
 
   createStore = AgentRunner.defaultCreateStore;
 
-  async chat(
-    params: ChatEngineParamsNonStreaming,
-  ): Promise<AgentChatResponse<ToolCallLLMMessageOptions>>;
+  async chat(params: ChatEngineParamsNonStreaming): Promise<EngineResponse>;
   async chat(params: ChatEngineParamsStreaming): Promise<never>;
   override async chat(
     params: ChatEngineParamsNonStreaming | ChatEngineParamsStreaming,
diff --git a/packages/core/src/agent/base.ts b/packages/core/src/agent/base.ts
index 1005c15594..a5e18df06c 100644
--- a/packages/core/src/agent/base.ts
+++ b/packages/core/src/agent/base.ts
@@ -1,4 +1,5 @@
 import { ReadableStream, TransformStream, randomUUID } from "@llamaindex/env";
+import { EngineResponse } from "../EngineResponse.js";
 import { Settings } from "../Settings.js";
 import {
   type ChatEngine,
@@ -9,13 +10,7 @@ import { wrapEventCaller } from "../internal/context/EventCaller.js";
 import { consoleLogger, emptyLogger } from "../internal/logger.js";
 import { getCallbackManager } from "../internal/settings/CallbackManager.js";
 import { isAsyncIterable } from "../internal/utils.js";
-import type {
-  ChatMessage,
-  ChatResponse,
-  ChatResponseChunk,
-  LLM,
-  MessageContent,
-} from "../llm/index.js";
+import type { ChatMessage, LLM, MessageContent } from "../llm/index.js";
 import type { BaseToolWithCall, ToolOutput } from "../types.js";
 import type {
   AgentTaskContext,
@@ -101,16 +96,6 @@ export function createTaskOutputStream<
   });
 }
 
-export type AgentStreamChatResponse<Options extends object> = {
-  response: ChatResponseChunk<Options>;
-  sources: ToolOutput[];
-};
-
-export type AgentChatResponse<Options extends object> = {
-  response: ChatResponse<Options>;
-  sources: ToolOutput[];
-};
-
 export type AgentRunnerParams<
   AI extends LLM,
   Store extends object = {},
@@ -210,11 +195,7 @@ export abstract class AgentRunner<
   >
     ? AdditionalMessageOptions
     : never,
-> implements
-    ChatEngine<
-      AgentChatResponse<AdditionalMessageOptions>,
-      ReadableStream<AgentStreamChatResponse<AdditionalMessageOptions>>
-    >
+> implements ChatEngine
 {
   readonly #llm: AI;
   readonly #tools:
@@ -320,47 +301,30 @@ export abstract class AgentRunner<
     });
   }
 
-  async chat(
-    params: ChatEngineParamsNonStreaming,
-  ): Promise<AgentChatResponse<AdditionalMessageOptions>>;
+  async chat(params: ChatEngineParamsNonStreaming): Promise<EngineResponse>;
   async chat(
     params: ChatEngineParamsStreaming,
-  ): Promise<ReadableStream<AgentStreamChatResponse<AdditionalMessageOptions>>>;
+  ): Promise<ReadableStream<EngineResponse>>;
   @wrapEventCaller
   async chat(
     params: ChatEngineParamsNonStreaming | ChatEngineParamsStreaming,
-  ): Promise<
-    | AgentChatResponse<AdditionalMessageOptions>
-    | ReadableStream<AgentStreamChatResponse<AdditionalMessageOptions>>
-  > {
+  ): Promise<EngineResponse | ReadableStream<EngineResponse>> {
     const task = this.createTask(params.message, !!params.stream);
     for await (const stepOutput of task) {
       // update chat history for each round
       this.#chatHistory = [...stepOutput.taskStep.context.store.messages];
       if (stepOutput.isLast) {
-        const { output, taskStep } = stepOutput;
+        const { output } = stepOutput;
         if (isAsyncIterable(output)) {
-          return output.pipeThrough<
-            AgentStreamChatResponse<AdditionalMessageOptions>
-          >(
+          return output.pipeThrough<EngineResponse>(
             new TransformStream({
               transform(chunk, controller) {
-                controller.enqueue({
-                  response: chunk,
-                  get sources() {
-                    return [...taskStep.context.store.toolOutputs];
-                  },
-                });
+                controller.enqueue(EngineResponse.fromChatResponseChunk(chunk));
               },
             }),
           );
         } else {
-          return {
-            response: output,
-            get sources() {
-              return [...taskStep.context.store.toolOutputs];
-            },
-          } satisfies AgentChatResponse<AdditionalMessageOptions>;
+          return EngineResponse.fromChatResponse(output);
         }
       }
     }
diff --git a/packages/core/src/engines/chat/CondenseQuestionChatEngine.ts b/packages/core/src/engines/chat/CondenseQuestionChatEngine.ts
index 2f885bfb5c..adf099dcd7 100644
--- a/packages/core/src/engines/chat/CondenseQuestionChatEngine.ts
+++ b/packages/core/src/engines/chat/CondenseQuestionChatEngine.ts
@@ -1,11 +1,11 @@
 import type { ChatHistory } from "../../ChatHistory.js";
 import { getHistory } from "../../ChatHistory.js";
+import type { EngineResponse } from "../../EngineResponse.js";
 import type { CondenseQuestionPrompt } from "../../Prompt.js";
 import {
   defaultCondenseQuestionPrompt,
   messagesToHistoryStr,
 } from "../../Prompt.js";
-import type { Response } from "../../Response.js";
 import type { ServiceContext } from "../../ServiceContext.js";
 import { llmFromSettingsOrContext } from "../../Settings.js";
 import { wrapEventCaller } from "../../internal/context/EventCaller.js";
@@ -80,12 +80,14 @@ export class CondenseQuestionChatEngine
     });
   }
 
-  chat(params: ChatEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  chat(params: ChatEngineParamsNonStreaming): Promise<Response>;
+  chat(
+    params: ChatEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  chat(params: ChatEngineParamsNonStreaming): Promise<EngineResponse>;
   @wrapEventCaller
   async chat(
     params: ChatEngineParamsStreaming | ChatEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { message, stream } = params;
     const chatHistory = params.chatHistory
       ? getHistory(params.chatHistory)
diff --git a/packages/core/src/engines/chat/ContextChatEngine.ts b/packages/core/src/engines/chat/ContextChatEngine.ts
index 5c9625f292..dcd90d2192 100644
--- a/packages/core/src/engines/chat/ContextChatEngine.ts
+++ b/packages/core/src/engines/chat/ContextChatEngine.ts
@@ -1,11 +1,11 @@
 import type { ChatHistory } from "../../ChatHistory.js";
 import { getHistory } from "../../ChatHistory.js";
+import { EngineResponse } from "../../EngineResponse.js";
 import type { ContextSystemPrompt } from "../../Prompt.js";
-import { Response } from "../../Response.js";
 import type { BaseRetriever } from "../../Retriever.js";
 import { Settings } from "../../Settings.js";
 import { wrapEventCaller } from "../../internal/context/EventCaller.js";
-import type { ChatMessage, ChatResponseChunk, LLM } from "../../llm/index.js";
+import type { ChatMessage, LLM } from "../../llm/index.js";
 import type { MessageContent, MessageType } from "../../llm/types.js";
 import {
   extractText,
@@ -24,8 +24,7 @@ import type {
 
 /**
  * ContextChatEngine uses the Index to get the appropriate context for each query.
- * The context is stored in the system prompt, and the chat history is preserved,
- * ideally allowing the appropriate context to be surfaced for each query.
+ * The context is stored in the system prompt, and the chat history is chunk: ChatResponseChunk, nodes?: NodeWithScore<import("/Users/marcus/code/llamaindex/LlamaIndexTS/packages/core/src/Node").Metadata>[], nodes?: NodeWithScore<import("/Users/marcus/code/llamaindex/LlamaIndexTS/packages/core/src/Node").Metadata>[]lowing the appropriate context to be surfaced for each query.
  */
 export class ContextChatEngine extends PromptMixin implements ChatEngine {
   chatModel: LLM;
@@ -60,12 +59,14 @@ export class ContextChatEngine extends PromptMixin implements ChatEngine {
     };
   }
 
-  chat(params: ChatEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  chat(params: ChatEngineParamsNonStreaming): Promise<Response>;
+  chat(
+    params: ChatEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  chat(params: ChatEngineParamsNonStreaming): Promise<EngineResponse>;
   @wrapEventCaller
   async chat(
     params: ChatEngineParamsStreaming | ChatEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { message, stream } = params;
     const chatHistory = params.chatHistory
       ? getHistory(params.chatHistory)
@@ -88,17 +89,14 @@ export class ContextChatEngine extends PromptMixin implements ChatEngine {
             chatHistory.addMessage({ content: accumulator, role: "assistant" });
           },
         }),
-        (r: ChatResponseChunk) => new Response(r.delta, requestMessages.nodes),
+        (r) => EngineResponse.fromChatResponseChunk(r, requestMessages.nodes),
       );
     }
     const response = await this.chatModel.chat({
       messages: requestMessages.messages,
     });
     chatHistory.addMessage(response.message);
-    return new Response(
-      extractText(response.message.content),
-      requestMessages.nodes,
-    );
+    return EngineResponse.fromChatResponse(response, requestMessages.nodes);
   }
 
   reset() {
diff --git a/packages/core/src/engines/chat/SimpleChatEngine.ts b/packages/core/src/engines/chat/SimpleChatEngine.ts
index dd6ab0a6d3..248831e0bb 100644
--- a/packages/core/src/engines/chat/SimpleChatEngine.ts
+++ b/packages/core/src/engines/chat/SimpleChatEngine.ts
@@ -1,14 +1,10 @@
 import type { ChatHistory } from "../../ChatHistory.js";
 import { getHistory } from "../../ChatHistory.js";
-import { Response } from "../../Response.js";
+import { EngineResponse } from "../../EngineResponse.js";
 import { Settings } from "../../Settings.js";
 import { wrapEventCaller } from "../../internal/context/EventCaller.js";
-import type { ChatResponseChunk, LLM } from "../../llm/index.js";
-import {
-  extractText,
-  streamConverter,
-  streamReducer,
-} from "../../llm/utils.js";
+import type { LLM } from "../../llm/index.js";
+import { streamConverter, streamReducer } from "../../llm/utils.js";
 import type {
   ChatEngine,
   ChatEngineParamsNonStreaming,
@@ -28,12 +24,14 @@ export class SimpleChatEngine implements ChatEngine {
     this.llm = init?.llm ?? Settings.llm;
   }
 
-  chat(params: ChatEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  chat(params: ChatEngineParamsNonStreaming): Promise<Response>;
+  chat(
+    params: ChatEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  chat(params: ChatEngineParamsNonStreaming): Promise<EngineResponse>;
   @wrapEventCaller
   async chat(
     params: ChatEngineParamsStreaming | ChatEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { message, stream } = params;
 
     const chatHistory = params.chatHistory
@@ -55,7 +53,7 @@ export class SimpleChatEngine implements ChatEngine {
             chatHistory.addMessage({ content: accumulator, role: "assistant" });
           },
         }),
-        (r: ChatResponseChunk) => new Response(r.delta),
+        EngineResponse.fromChatResponseChunk,
       );
     }
 
@@ -63,7 +61,7 @@ export class SimpleChatEngine implements ChatEngine {
       messages: await chatHistory.requestMessages(),
     });
     chatHistory.addMessage(response.message);
-    return new Response(extractText(response.message.content));
+    return EngineResponse.fromChatResponse(response);
   }
 
   reset() {
diff --git a/packages/core/src/engines/chat/types.ts b/packages/core/src/engines/chat/types.ts
index 0b00f1d1db..925187b6fe 100644
--- a/packages/core/src/engines/chat/types.ts
+++ b/packages/core/src/engines/chat/types.ts
@@ -1,6 +1,6 @@
 import type { ChatHistory } from "../../ChatHistory.js";
+import type { EngineResponse } from "../../EngineResponse.js";
 import type { NodeWithScore } from "../../Node.js";
-import type { Response } from "../../Response.js";
 import type { ChatMessage } from "../../llm/index.js";
 import type { MessageContent } from "../../llm/types.js";
 
@@ -33,7 +33,7 @@ export interface ChatEngineParamsNonStreaming extends ChatEngineParamsBase {
  */
 export interface ChatEngine<
   // synchronous response
-  R = Response,
+  R = EngineResponse,
   // asynchronous response
   AR extends AsyncIterable<unknown> = AsyncIterable<R>,
 > {
diff --git a/packages/core/src/engines/query/RetrieverQueryEngine.ts b/packages/core/src/engines/query/RetrieverQueryEngine.ts
index 153cb42657..9b265e54f7 100644
--- a/packages/core/src/engines/query/RetrieverQueryEngine.ts
+++ b/packages/core/src/engines/query/RetrieverQueryEngine.ts
@@ -1,5 +1,5 @@
+import type { EngineResponse } from "../../EngineResponse.js";
 import type { NodeWithScore } from "../../Node.js";
-import type { Response } from "../../Response.js";
 import type { BaseRetriever } from "../../Retriever.js";
 import { wrapEventCaller } from "../../internal/context/EventCaller.js";
 import type { BaseNodePostprocessor } from "../../postprocessors/index.js";
@@ -67,12 +67,14 @@ export class RetrieverQueryEngine extends PromptMixin implements QueryEngine {
     return await this.applyNodePostprocessors(nodes, query);
   }
 
-  query(params: QueryEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  query(params: QueryEngineParamsNonStreaming): Promise<Response>;
+  query(
+    params: QueryEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  query(params: QueryEngineParamsNonStreaming): Promise<EngineResponse>;
   @wrapEventCaller
   async query(
     params: QueryEngineParamsStreaming | QueryEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { query, stream } = params;
     const nodesWithScore = await this.retrieve(query);
     if (stream) {
diff --git a/packages/core/src/engines/query/RouterQueryEngine.ts b/packages/core/src/engines/query/RouterQueryEngine.ts
index 197fec0766..6ffa0f9662 100644
--- a/packages/core/src/engines/query/RouterQueryEngine.ts
+++ b/packages/core/src/engines/query/RouterQueryEngine.ts
@@ -1,5 +1,5 @@
+import { EngineResponse } from "../../EngineResponse.js";
 import type { NodeWithScore } from "../../Node.js";
-import { Response } from "../../Response.js";
 import type { ServiceContext } from "../../ServiceContext.js";
 import { llmFromSettingsOrContext } from "../../Settings.js";
 import { PromptMixin } from "../../prompts/index.js";
@@ -24,10 +24,10 @@ type RouterQueryEngineMetadata = {
 
 async function combineResponses(
   summarizer: TreeSummarize,
-  responses: Response[],
+  responses: EngineResponse[],
   queryBundle: QueryBundle,
   verbose: boolean = false,
-): Promise<Response> {
+): Promise<EngineResponse> {
   if (verbose) {
     console.log("Combining responses from multiple query engines.");
   }
@@ -48,7 +48,7 @@ async function combineResponses(
     textChunks: responseStrs,
   });
 
-  return new Response(summary, sourceNodes);
+  return EngineResponse.fromResponse(summary, false, sourceNodes);
 }
 
 /**
@@ -108,11 +108,13 @@ export class RouterQueryEngine extends PromptMixin implements QueryEngine {
     });
   }
 
-  query(params: QueryEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  query(params: QueryEngineParamsNonStreaming): Promise<Response>;
+  query(
+    params: QueryEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  query(params: QueryEngineParamsNonStreaming): Promise<EngineResponse>;
   async query(
     params: QueryEngineParamsStreaming | QueryEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { query, stream } = params;
 
     const response = await this.queryRoute({ queryStr: query });
@@ -124,11 +126,11 @@ export class RouterQueryEngine extends PromptMixin implements QueryEngine {
     return response;
   }
 
-  private async queryRoute(queryBundle: QueryBundle): Promise<Response> {
+  private async queryRoute(queryBundle: QueryBundle): Promise<EngineResponse> {
     const result = await this.selector.select(this.metadatas, queryBundle);
 
     if (result.selections.length > 1) {
-      const responses: Response[] = [];
+      const responses: EngineResponse[] = [];
       for (let i = 0; i < result.selections.length; i++) {
         const engineInd = result.selections[i];
         const logStr = `Selecting query engine ${engineInd}: ${result.selections[i]}.`;
diff --git a/packages/core/src/engines/query/SubQuestionQueryEngine.ts b/packages/core/src/engines/query/SubQuestionQueryEngine.ts
index 188e0ab9aa..98e17528e7 100644
--- a/packages/core/src/engines/query/SubQuestionQueryEngine.ts
+++ b/packages/core/src/engines/query/SubQuestionQueryEngine.ts
@@ -1,7 +1,7 @@
+import type { EngineResponse } from "../../EngineResponse.js";
 import type { NodeWithScore } from "../../Node.js";
 import { TextNode } from "../../Node.js";
 import { LLMQuestionGenerator } from "../../QuestionGenerator.js";
-import type { Response } from "../../Response.js";
 import type { ServiceContext } from "../../ServiceContext.js";
 import { PromptMixin } from "../../prompts/Mixin.js";
 import type { BaseSynthesizer } from "../../synthesizers/index.js";
@@ -74,12 +74,14 @@ export class SubQuestionQueryEngine extends PromptMixin implements QueryEngine {
     });
   }
 
-  query(params: QueryEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  query(params: QueryEngineParamsNonStreaming): Promise<Response>;
+  query(
+    params: QueryEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  query(params: QueryEngineParamsNonStreaming): Promise<EngineResponse>;
   @wrapEventCaller
   async query(
     params: QueryEngineParamsStreaming | QueryEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { query, stream } = params;
     const subQuestions = await this.questionGen.generate(this.metadatas, query);
 
diff --git a/packages/core/src/evaluation/types.ts b/packages/core/src/evaluation/types.ts
index 94ced95bd4..a38146b0fd 100644
--- a/packages/core/src/evaluation/types.ts
+++ b/packages/core/src/evaluation/types.ts
@@ -1,4 +1,4 @@
-import { Response } from "../Response.js";
+import { EngineResponse } from "../EngineResponse.js";
 
 export type EvaluationResult = {
   query?: string;
@@ -22,7 +22,7 @@ export type EvaluatorParams = {
 
 export type EvaluatorResponseParams = {
   query: string | null;
-  response: Response;
+  response: EngineResponse;
 };
 export interface BaseEvaluator {
   evaluate(params: EvaluatorParams): Promise<EvaluationResult>;
diff --git a/packages/core/src/index.edge.ts b/packages/core/src/index.edge.ts
index 37a9f0993e..6c4907f2a4 100644
--- a/packages/core/src/index.edge.ts
+++ b/packages/core/src/index.edge.ts
@@ -1,10 +1,10 @@
 export * from "./ChatHistory.js";
+export * from "./EngineResponse.js";
 export * from "./Node.js";
 export * from "./OutputParser.js";
 export * from "./Prompt.js";
 export * from "./PromptHelper.js";
 export * from "./QuestionGenerator.js";
-export * from "./Response.js";
 export * from "./Retriever.js";
 export * from "./ServiceContext.js";
 export { Settings } from "./Settings.js";
diff --git a/packages/core/src/synthesizers/MultiModalResponseSynthesizer.ts b/packages/core/src/synthesizers/MultiModalResponseSynthesizer.ts
index 3eca33ebd7..21aa5efb6f 100644
--- a/packages/core/src/synthesizers/MultiModalResponseSynthesizer.ts
+++ b/packages/core/src/synthesizers/MultiModalResponseSynthesizer.ts
@@ -1,5 +1,5 @@
+import { EngineResponse } from "../EngineResponse.js";
 import { MetadataMode } from "../Node.js";
-import { Response } from "../Response.js";
 import type { ServiceContext } from "../ServiceContext.js";
 import { llmFromSettingsOrContext } from "../Settings.js";
 import { streamConverter } from "../llm/utils.js";
@@ -49,14 +49,14 @@ export class MultiModalResponseSynthesizer
 
   synthesize(
     params: SynthesizeParamsStreaming,
-  ): Promise<AsyncIterable<Response>>;
-  synthesize(params: SynthesizeParamsNonStreaming): Promise<Response>;
+  ): Promise<AsyncIterable<EngineResponse>>;
+  synthesize(params: SynthesizeParamsNonStreaming): Promise<EngineResponse>;
   async synthesize({
     query,
     nodesWithScore,
     stream,
   }: SynthesizeParamsStreaming | SynthesizeParamsNonStreaming): Promise<
-    AsyncIterable<Response> | Response
+    AsyncIterable<EngineResponse> | EngineResponse
   > {
     const nodes = nodesWithScore.map(({ node }) => node);
     const prompt = await createMessageContent(
@@ -73,14 +73,13 @@ export class MultiModalResponseSynthesizer
         prompt,
         stream,
       });
-      return streamConverter(
-        response,
-        ({ text }) => new Response(text, nodesWithScore),
+      return streamConverter(response, ({ text }) =>
+        EngineResponse.fromResponse(text, true, nodesWithScore),
       );
     }
     const response = await llm.complete({
       prompt,
     });
-    return new Response(response.text, nodesWithScore);
+    return EngineResponse.fromResponse(response.text, false, nodesWithScore);
   }
 }
diff --git a/packages/core/src/synthesizers/ResponseSynthesizer.ts b/packages/core/src/synthesizers/ResponseSynthesizer.ts
index 22a8903eee..a9faab1d89 100644
--- a/packages/core/src/synthesizers/ResponseSynthesizer.ts
+++ b/packages/core/src/synthesizers/ResponseSynthesizer.ts
@@ -1,5 +1,5 @@
+import { EngineResponse } from "../EngineResponse.js";
 import { MetadataMode } from "../Node.js";
-import { Response } from "../Response.js";
 import type { ServiceContext } from "../ServiceContext.js";
 import { streamConverter } from "../llm/utils.js";
 import { PromptMixin } from "../prompts/Mixin.js";
@@ -57,14 +57,14 @@ export class ResponseSynthesizer
 
   synthesize(
     params: SynthesizeParamsStreaming,
-  ): Promise<AsyncIterable<Response>>;
-  synthesize(params: SynthesizeParamsNonStreaming): Promise<Response>;
+  ): Promise<AsyncIterable<EngineResponse>>;
+  synthesize(params: SynthesizeParamsNonStreaming): Promise<EngineResponse>;
   async synthesize({
     query,
     nodesWithScore,
     stream,
   }: SynthesizeParamsStreaming | SynthesizeParamsNonStreaming): Promise<
-    AsyncIterable<Response> | Response
+    AsyncIterable<EngineResponse> | EngineResponse
   > {
     const textChunks: string[] = nodesWithScore.map(({ node }) =>
       node.getContent(this.metadataMode),
@@ -75,15 +75,14 @@ export class ResponseSynthesizer
         textChunks,
         stream,
       });
-      return streamConverter(
-        response,
-        (chunk) => new Response(chunk, nodesWithScore),
+      return streamConverter(response, (chunk) =>
+        EngineResponse.fromResponse(chunk, true, nodesWithScore),
       );
     }
     const response = await this.responseBuilder.getResponse({
       query,
       textChunks,
     });
-    return new Response(response, nodesWithScore);
+    return EngineResponse.fromResponse(response, false, nodesWithScore);
   }
 }
diff --git a/packages/core/src/synthesizers/types.ts b/packages/core/src/synthesizers/types.ts
index abfcd9b16b..67e998a6ae 100644
--- a/packages/core/src/synthesizers/types.ts
+++ b/packages/core/src/synthesizers/types.ts
@@ -1,6 +1,6 @@
+import type { EngineResponse } from "../EngineResponse.js";
 import type { NodeWithScore } from "../Node.js";
 import type { PromptMixin } from "../prompts/Mixin.js";
-import type { Response } from "../Response.js";
 
 export interface SynthesizeParamsBase {
   query: string;
@@ -21,8 +21,8 @@ export interface SynthesizeParamsNonStreaming extends SynthesizeParamsBase {
 export interface BaseSynthesizer {
   synthesize(
     params: SynthesizeParamsStreaming,
-  ): Promise<AsyncIterable<Response>>;
-  synthesize(params: SynthesizeParamsNonStreaming): Promise<Response>;
+  ): Promise<AsyncIterable<EngineResponse>>;
+  synthesize(params: SynthesizeParamsNonStreaming): Promise<EngineResponse>;
 }
 
 export interface ResponseBuilderParamsBase {
diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index f187649431..c1f1292827 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -2,7 +2,7 @@
  * Top level types to avoid circular dependencies
  */
 import { type JSONSchemaType } from "ajv";
-import type { Response } from "./Response.js";
+import type { EngineResponse } from "./EngineResponse.js";
 
 /**
  * Parameters for sending a query.
@@ -27,8 +27,10 @@ export interface QueryEngine {
    * Query the query engine and get a response.
    * @param params
    */
-  query(params: QueryEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  query(params: QueryEngineParamsNonStreaming): Promise<Response>;
+  query(
+    params: QueryEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  query(params: QueryEngineParamsNonStreaming): Promise<EngineResponse>;
 }
 
 type Known =
diff --git a/packages/experimental/src/engines/query/JSONQueryEngine.ts b/packages/experimental/src/engines/query/JSONQueryEngine.ts
index c911407968..4f5e469e51 100644
--- a/packages/experimental/src/engines/query/JSONQueryEngine.ts
+++ b/packages/experimental/src/engines/query/JSONQueryEngine.ts
@@ -1,6 +1,6 @@
 import jsonpath from "jsonpath";
 
-import { Response } from "llamaindex";
+import { EngineResponse } from "llamaindex";
 
 import { serviceContextFromDefaults, type ServiceContext } from "llamaindex";
 
@@ -147,11 +147,13 @@ export class JSONQueryEngine implements QueryEngine {
     return JSON.stringify(this.jsonSchema);
   }
 
-  query(params: QueryEngineParamsStreaming): Promise<AsyncIterable<Response>>;
-  query(params: QueryEngineParamsNonStreaming): Promise<Response>;
+  query(
+    params: QueryEngineParamsStreaming,
+  ): Promise<AsyncIterable<EngineResponse>>;
+  query(params: QueryEngineParamsNonStreaming): Promise<EngineResponse>;
   async query(
     params: QueryEngineParamsStreaming | QueryEngineParamsNonStreaming,
-  ): Promise<Response | AsyncIterable<Response>> {
+  ): Promise<EngineResponse | AsyncIterable<EngineResponse>> {
     const { query, stream } = params;
 
     if (stream) {
@@ -200,7 +202,7 @@ export class JSONQueryEngine implements QueryEngine {
       jsonPathResponseStr,
     };
 
-    const response = new Response(responseStr, []);
+    const response = EngineResponse.fromResponse(responseStr, false);
 
     response.metadata = responseMetadata;