diff --git a/packages/types/src/providers/anthropic.ts b/packages/types/src/providers/anthropic.ts
index 5fbf62d50782..ade4c2da4597 100644
--- a/packages/types/src/providers/anthropic.ts
+++ b/packages/types/src/providers/anthropic.ts
@@ -3,7 +3,7 @@ import type { ModelInfo } from "../model.js"
 // https://docs.anthropic.com/en/docs/about-claude/models
 
 export type AnthropicModelId = keyof typeof anthropicModels
-export const anthropicDefaultModelId: AnthropicModelId = "claude-sonnet-4-20250514"
+export const anthropicDefaultModelId: AnthropicModelId = "claude-sonnet-4-5"
 
 export const anthropicModels = {
 	"claude-sonnet-4-5": {
diff --git a/packages/types/src/providers/bedrock.ts b/packages/types/src/providers/bedrock.ts
index 9935d90b127a..170a1ec6acd8 100644
--- a/packages/types/src/providers/bedrock.ts
+++ b/packages/types/src/providers/bedrock.ts
@@ -4,7 +4,7 @@ import type { ModelInfo } from "../model.js"
 
 export type BedrockModelId = keyof typeof bedrockModels
 
-export const bedrockDefaultModelId: BedrockModelId = "anthropic.claude-sonnet-4-20250514-v1:0"
+export const bedrockDefaultModelId: BedrockModelId = "anthropic.claude-sonnet-4-5-20250929-v1:0"
 
 export const bedrockDefaultPromptRouterModelId: BedrockModelId = "anthropic.claude-3-sonnet-20240229-v1:0"
 
diff --git a/packages/types/src/providers/claude-code.ts b/packages/types/src/providers/claude-code.ts
index d0b0f680af93..c0982889a75e 100644
--- a/packages/types/src/providers/claude-code.ts
+++ b/packages/types/src/providers/claude-code.ts
@@ -21,7 +21,7 @@ export function convertModelNameForVertex(modelName: string): string {
 
 // Claude Code
 export type ClaudeCodeModelId = keyof typeof claudeCodeModels
-export const claudeCodeDefaultModelId: ClaudeCodeModelId = "claude-sonnet-4-20250514"
+export const claudeCodeDefaultModelId: ClaudeCodeModelId = "claude-sonnet-4-5"
 export const CLAUDE_CODE_DEFAULT_MAX_OUTPUT_TOKENS = 16000
 
 /**
diff --git a/packages/types/src/providers/openrouter.ts b/packages/types/src/providers/openrouter.ts
index 3a77ba14fc6e..e15157079684 100644
--- a/packages/types/src/providers/openrouter.ts
+++ b/packages/types/src/providers/openrouter.ts
@@ -1,7 +1,7 @@
 import type { ModelInfo } from "../model.js"
 
 // https://openrouter.ai/models?order=newest&supported_parameters=tools
-export const openRouterDefaultModelId = "anthropic/claude-sonnet-4"
+export const openRouterDefaultModelId = "anthropic/claude-sonnet-4.5"
 
 export const openRouterDefaultModelInfo: ModelInfo = {
 	maxTokens: 8192,
diff --git a/packages/types/src/providers/unbound.ts b/packages/types/src/providers/unbound.ts
index cc73f420d1f5..9715b835c9bb 100644
--- a/packages/types/src/providers/unbound.ts
+++ b/packages/types/src/providers/unbound.ts
@@ -1,6 +1,6 @@
 import type { ModelInfo } from "../model.js"
 
-export const unboundDefaultModelId = "anthropic/claude-3-7-sonnet-20250219"
+export const unboundDefaultModelId = "anthropic/claude-sonnet-4-5"
 
 export const unboundDefaultModelInfo: ModelInfo = {
 	maxTokens: 8192,
diff --git a/src/api/providers/__tests__/claude-code.spec.ts b/src/api/providers/__tests__/claude-code.spec.ts
index 8d154d794f26..41375432027d 100644
--- a/src/api/providers/__tests__/claude-code.spec.ts
+++ b/src/api/providers/__tests__/claude-code.spec.ts
@@ -44,7 +44,7 @@ describe("ClaudeCodeHandler", () => {
 		const handlerWithInvalidModel = new ClaudeCodeHandler(options)
 		const model = handlerWithInvalidModel.getModel()
 
-		expect(model.id).toBe("claude-sonnet-4-20250514") // default model
+		expect(model.id).toBe("claude-sonnet-4-5") // default model
 	})
 
 	test("should override maxTokens when claudeCodeMaxOutputTokens is provided", () => {
@@ -69,7 +69,7 @@ describe("ClaudeCodeHandler", () => {
 		const handlerWithMaxTokens = new ClaudeCodeHandler(options)
 		const model = handlerWithMaxTokens.getModel()
 
-		expect(model.id).toBe("claude-sonnet-4-20250514") // default model
+		expect(model.id).toBe("claude-sonnet-4-5") // default model
 		expect(model.info.maxTokens).toBe(16384) // Should use the configured value
 	})
 
diff --git a/src/api/providers/__tests__/openrouter.spec.ts b/src/api/providers/__tests__/openrouter.spec.ts
index bf130a05821e..f5067ef34c96 100644
--- a/src/api/providers/__tests__/openrouter.spec.ts
+++ b/src/api/providers/__tests__/openrouter.spec.ts
@@ -28,6 +28,18 @@ vitest.mock("../fetchers/modelCache", () => ({
 				description: "Claude 3.7 Sonnet",
 				thinking: false,
 			},
+			"anthropic/claude-sonnet-4.5": {
+				maxTokens: 8192,
+				contextWindow: 200000,
+				supportsImages: true,
+				supportsPromptCache: true,
+				inputPrice: 3,
+				outputPrice: 15,
+				cacheWritesPrice: 3.75,
+				cacheReadsPrice: 0.3,
+				description: "Claude 4.5 Sonnet",
+				thinking: false,
+			},
 			"anthropic/claude-3.7-sonnet:thinking": {
 				maxTokens: 128000,
 				contextWindow: 200000,
@@ -83,7 +95,7 @@ describe("OpenRouterHandler", () => {
 		it("returns default model info when options are not provided", async () => {
 			const handler = new OpenRouterHandler({})
 			const result = await handler.fetchModel()
-			expect(result.id).toBe("anthropic/claude-sonnet-4")
+			expect(result.id).toBe("anthropic/claude-sonnet-4.5")
 			expect(result.info.supportsPromptCache).toBe(true)
 		})
 
diff --git a/src/api/providers/__tests__/unbound.spec.ts b/src/api/providers/__tests__/unbound.spec.ts
index c49685b121a1..fb52e2cb8cbb 100644
--- a/src/api/providers/__tests__/unbound.spec.ts
+++ b/src/api/providers/__tests__/unbound.spec.ts
@@ -22,6 +22,18 @@ vitest.mock("../fetchers/modelCache", () => ({
 				description: "Claude 3.5 Sonnet",
 				thinking: false,
 			},
+			"anthropic/claude-sonnet-4-5": {
+				maxTokens: 8192,
+				contextWindow: 200000,
+				supportsImages: true,
+				supportsPromptCache: true,
+				inputPrice: 3,
+				outputPrice: 15,
+				cacheWritesPrice: 3.75,
+				cacheReadsPrice: 0.3,
+				description: "Claude 4.5 Sonnet",
+				thinking: false,
+			},
 			"anthropic/claude-3-7-sonnet-20250219": {
 				maxTokens: 8192,
 				contextWindow: 200000,
@@ -312,7 +324,7 @@ describe("UnboundHandler", () => {
 		it("should return default model when invalid model provided", async () => {
 			const handlerWithInvalidModel = new UnboundHandler({ ...mockOptions, unboundModelId: "invalid/model" })
 			const modelInfo = await handlerWithInvalidModel.fetchModel()
-			expect(modelInfo.id).toBe("anthropic/claude-3-7-sonnet-20250219")
+			expect(modelInfo.id).toBe("anthropic/claude-sonnet-4-5")
 			expect(modelInfo.info).toBeDefined()
 		})
 	})
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 e49944a9975c..6260fdcfdec9 100644
--- a/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
+++ b/webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
@@ -367,7 +367,7 @@ describe("useSelectedModel", () => {
 			const { result } = renderHook(() => useSelectedModel(), { wrapper })
 
 			expect(result.current.provider).toBe("anthropic")
-			expect(result.current.id).toBe("claude-sonnet-4-20250514")
+			expect(result.current.id).toBe("claude-sonnet-4-5")
 			expect(result.current.info).toBeUndefined()
 		})
 	})
@@ -439,7 +439,7 @@ describe("useSelectedModel", () => {
 			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
 
 			expect(result.current.provider).toBe("claude-code")
-			expect(result.current.id).toBe("claude-sonnet-4-20250514") // Default model
+			expect(result.current.id).toBe("claude-sonnet-4-5") // Default model
 			expect(result.current.info).toBeDefined()
 			expect(result.current.info?.supportsImages).toBe(false)
 		})