diff --git a/src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md b/src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md
index 37ffe79f892..a5cf85aba1c 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md
+++ b/src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md
@@ -2,9 +2,13 @@
 
 ## NOT YET RELEASED
 
+## 9.9.0
+
 - Added non-invocable `AIFunctionDeclaration` (base class for `AIFunction`), `AIFunctionFactory.CreateDeclaration`, and `AIFunction.AsDeclarationOnly`.
 - Added `[Experimental]` support for user approval of function invocations via `ApprovalRequiredAIFunction`, `FunctionApprovalRequestContent`, and friends.
 - Added `[Experimental]` support for MCP server-hosted tools via `HostedMcpServerTool`, `HostedMcpServerToolApprovalMode`, and friends.
+- Updated `AIContent` coalescing logic used by `ToChatResponse`/`ToChatResponseUpdate` to factor in `ChatMessage.Role`.
+- Moved `IChatReducer` into `Microsoft.Extensions.AI.Abstractions` from `Microsoft.Extensions.AI`.
 
 ## 9.8.0
 
diff --git a/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/CHANGELOG.md b/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/CHANGELOG.md
index 4ba77ddf8cc..8c1a5f5aba5 100644
--- a/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/CHANGELOG.md
+++ b/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/CHANGELOG.md
@@ -2,8 +2,11 @@
 
 ## NOT YET RELEASED
 
+## 9.9.0-preview.1.25458.4
+
 - Updated tool mapping to recognize any `AIFunctionDeclaration`.
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.
+- Updated `AsIChatClient` for `OpenAIResponseClient` to support reasoning content with `GetStreamingResponseAsync`.
 
 ## 9.8.0-preview.1.25412.6
 
diff --git a/src/Libraries/Microsoft.Extensions.AI.OpenAI/CHANGELOG.md b/src/Libraries/Microsoft.Extensions.AI.OpenAI/CHANGELOG.md
index ded1e85533f..6673d09d52f 100644
--- a/src/Libraries/Microsoft.Extensions.AI.OpenAI/CHANGELOG.md
+++ b/src/Libraries/Microsoft.Extensions.AI.OpenAI/CHANGELOG.md
@@ -2,9 +2,12 @@
 
 ## NOT YET RELEASED
 
+## 9.9.0-preview.1.25458.4
+
 - Updated to depend on OpenAI 2.4.0
 - Updated tool mappings to recognize any `AIFunctionDeclaration`.
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.
+- Fixed handling of annotated but empty content in the `AsIChatClient` for `AssistantClient`.
 
 ## 9.8.0-preview.1.25412.6
 
diff --git a/src/Libraries/Microsoft.Extensions.AI/CHANGELOG.md b/src/Libraries/Microsoft.Extensions.AI/CHANGELOG.md
index a7c46b1d56d..1a4e630ca0a 100644
--- a/src/Libraries/Microsoft.Extensions.AI/CHANGELOG.md
+++ b/src/Libraries/Microsoft.Extensions.AI/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## NOT YET RELEASED
 
+- Updated the EnableSensitiveData properties on OpenTelemetryChatClient/EmbeddingGenerator to respect a OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT environment variable.
+
+## 9.9.0
+
 - Added `FunctionInvokingChatClient` support for non-invocable tools and `TerminateOnUnknownCalls` property.
 - Added support to `FunctionInvokingChatClient` for user approval of function invocations.
 - Updated the Open Telemetry instrumentation to conform to the latest 1.37.0 draft specification of the Semantic Conventions for Generative AI systems.