diff --git a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
index 9907017b53d..4dca874ee20 100644
--- a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
+++ b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
@@ -5,7 +5,13 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
 import { renderHook } from "@testing-library/react"
 import type { Mock } from "vitest"
 
-import { ProviderSettings, ModelInfo, BEDROCK_1M_CONTEXT_MODEL_IDS, litellmDefaultModelInfo } from "@roo-code/types"
+import {
+	ProviderSettings,
+	ModelInfo,
+	BEDROCK_1M_CONTEXT_MODEL_IDS,
+	litellmDefaultModelInfo,
+	openAiModelInfoSaneDefaults,
+} from "@roo-code/types"
 
 import { useSelectedModel } from "../useSelectedModel"
 import { useRouterModels } from "../useRouterModels"
@@ -661,4 +667,100 @@ describe("useSelectedModel", () => {
 			expect(result.current.info?.defaultToolProtocol).toBe("native")
 		})
 	})
+
+	describe("openai provider", () => {
+		beforeEach(() => {
+			mockUseRouterModels.mockReturnValue({
+				data: {
+					openrouter: {},
+					requesty: {},
+					unbound: {},
+					litellm: {},
+					"io-intelligence": {},
+				},
+				isLoading: false,
+				isError: false,
+			} as any)
+
+			mockUseOpenRouterModelProviders.mockReturnValue({
+				data: {},
+				isLoading: false,
+				isError: false,
+			} as any)
+		})
+
+		it("should use openAiModelInfoSaneDefaults when no custom model info is provided", () => {
+			const apiConfiguration: ProviderSettings = {
+				apiProvider: "openai",
+				openAiModelId: "gpt-4o",
+			}
+
+			const wrapper = createWrapper()
+			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
+
+			expect(result.current.provider).toBe("openai")
+			expect(result.current.id).toBe("gpt-4o")
+			expect(result.current.info).toEqual(openAiModelInfoSaneDefaults)
+			expect(result.current.info?.supportsNativeTools).toBe(true)
+			expect(result.current.info?.defaultToolProtocol).toBe("native")
+		})
+
+		it("should merge native tool defaults with custom model info", () => {
+			const customModelInfo: ModelInfo = {
+				maxTokens: 16384,
+				contextWindow: 128000,
+				supportsImages: true,
+				supportsPromptCache: false,
+				inputPrice: 0.01,
+				outputPrice: 0.03,
+				description: "Custom OpenAI-compatible model",
+			}
+
+			const apiConfiguration: ProviderSettings = {
+				apiProvider: "openai",
+				openAiModelId: "custom-model",
+				openAiCustomModelInfo: customModelInfo,
+			}
+
+			const wrapper = createWrapper()
+			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
+
+			expect(result.current.provider).toBe("openai")
+			expect(result.current.id).toBe("custom-model")
+			// Should merge native tool defaults with custom model info
+			const nativeToolDefaults = {
+				supportsNativeTools: openAiModelInfoSaneDefaults.supportsNativeTools,
+				defaultToolProtocol: openAiModelInfoSaneDefaults.defaultToolProtocol,
+			}
+			expect(result.current.info).toEqual({ ...nativeToolDefaults, ...customModelInfo })
+			expect(result.current.info?.supportsNativeTools).toBe(true)
+			expect(result.current.info?.defaultToolProtocol).toBe("native")
+		})
+
+		it("should allow custom model info to override native tool defaults", () => {
+			const customModelInfo: ModelInfo = {
+				maxTokens: 8192,
+				contextWindow: 32000,
+				supportsImages: false,
+				supportsPromptCache: false,
+				supportsNativeTools: false, // Explicitly disable
+				defaultToolProtocol: "xml", // Override default to use XML instead of native
+			}
+
+			const apiConfiguration: ProviderSettings = {
+				apiProvider: "openai",
+				openAiModelId: "custom-model-no-tools",
+				openAiCustomModelInfo: customModelInfo,
+			}
+
+			const wrapper = createWrapper()
+			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
+
+			expect(result.current.provider).toBe("openai")
+			expect(result.current.id).toBe("custom-model-no-tools")
+			// Custom model info should override the native tool defaults
+			expect(result.current.info?.supportsNativeTools).toBe(false)
+			expect(result.current.info?.defaultToolProtocol).toBe("xml")
+		})
+	})
 })
diff --git a/webview-ui/src/components/ui/hooks/useSelectedModel.ts b/webview-ui/src/components/ui/hooks/useSelectedModel.ts
index f405dd78930..7748de49bde 100644
--- a/webview-ui/src/components/ui/hooks/useSelectedModel.ts
+++ b/webview-ui/src/components/ui/hooks/useSelectedModel.ts
@@ -279,7 +279,13 @@ function getSelectedModel({
 		}
 		case "openai": {
 			const id = apiConfiguration.openAiModelId ?? ""
-			const info = apiConfiguration?.openAiCustomModelInfo ?? openAiModelInfoSaneDefaults
+			const customInfo = apiConfiguration?.openAiCustomModelInfo
+			// Only merge native tool call defaults, not prices or other model-specific info
+			const nativeToolDefaults = {
+				supportsNativeTools: openAiModelInfoSaneDefaults.supportsNativeTools,
+				defaultToolProtocol: openAiModelInfoSaneDefaults.defaultToolProtocol,
+			}
+			const info = customInfo ? { ...nativeToolDefaults, ...customInfo } : openAiModelInfoSaneDefaults
 			return { id, info }
 		}
 		case "ollama": {