diff --git a/packages/types/src/providers/roo.ts b/packages/types/src/providers/roo.ts
index 1306d244a5b..34bc9abf1cc 100644
--- a/packages/types/src/providers/roo.ts
+++ b/packages/types/src/providers/roo.ts
@@ -6,7 +6,7 @@ import type { ModelInfo } from "../model.js"
  * Roo Code Cloud is a dynamic provider - models are loaded from the /v1/models API endpoint.
  * Default model ID used as fallback when no model is specified.
  */
-export const rooDefaultModelId = "xai/grok-code-fast-1"
+export const rooDefaultModelId = "anthropic/claude-sonnet-4.5"
 
 /**
  * Empty models object maintained for type compatibility.
diff --git a/src/api/providers/__tests__/roo.spec.ts b/src/api/providers/__tests__/roo.spec.ts
index a6a76fe100d..2a650decb8a 100644
--- a/src/api/providers/__tests__/roo.spec.ts
+++ b/src/api/providers/__tests__/roo.spec.ts
@@ -93,14 +93,14 @@ vitest.mock("../../providers/fetchers/modelCache", () => ({
 	getModelsFromCache: vitest.fn((provider: string) => {
 		if (provider === "roo") {
 			return {
-				"xai/grok-code-fast-1": {
-					maxTokens: 16_384,
-					contextWindow: 262_144,
-					supportsImages: false,
-					supportsReasoningEffort: true, // Enable reasoning for tests
+				"anthropic/claude-sonnet-4.5": {
+					maxTokens: 8_192,
+					contextWindow: 200_000,
+					supportsImages: true,
+					supportsReasoningEffort: true,
 					supportsPromptCache: true,
-					inputPrice: 0,
-					outputPrice: 0,
+					inputPrice: 3,
+					outputPrice: 15,
 				},
 				"minimax/minimax-m2:free": {
 					maxTokens: 32_768,
@@ -141,7 +141,7 @@ describe("RooHandler", () => {
 
 	beforeEach(() => {
 		mockOptions = {
-			apiModelId: "xai/grok-code-fast-1",
+			apiModelId: "anthropic/claude-sonnet-4.5",
 		}
 		// Set up CloudService mocks for successful authentication
 		mockHasInstanceFn.mockReturnValue(true)
@@ -410,7 +410,7 @@ describe("RooHandler", () => {
 
 		it("should handle any model ID since models are loaded dynamically", () => {
 			// Test with various model IDs - they should all work since models are loaded dynamically
-			const testModelIds = ["xai/grok-code-fast-1", "roo/sonic", "deepseek/deepseek-chat-v3.1"]
+			const testModelIds = ["anthropic/claude-sonnet-4.5", "roo/sonic", "deepseek/deepseek-chat-v3.1"]
 
 			for (const modelId of testModelIds) {
 				const handlerWithModel = new RooHandler({ apiModelId: modelId })
diff --git a/src/api/providers/fetchers/__tests__/roo.spec.ts b/src/api/providers/fetchers/__tests__/roo.spec.ts
index bb3b08b63fa..257c8b98014 100644
--- a/src/api/providers/fetchers/__tests__/roo.spec.ts
+++ b/src/api/providers/fetchers/__tests__/roo.spec.ts
@@ -24,11 +24,11 @@ describe("getRooModels", () => {
 			object: "list",
 			data: [
 				{
-					id: "xai/grok-code-fast-1",
+					id: "anthropic/claude-sonnet-4.5",
 					object: "model",
 					created: 1234567890,
-					owned_by: "xai",
-					name: "Grok Code Fast 1",
+					owned_by: "anthropic",
+					name: "Claude Sonnet 4.5",
 					description: "Fast coding model",
 					context_window: 262144,
 					max_tokens: 16384,
@@ -63,7 +63,7 @@ describe("getRooModels", () => {
 		)
 
 		expect(models).toEqual({
-			"xai/grok-code-fast-1": {
+			"anthropic/claude-sonnet-4.5": {
 				maxTokens: 16384,
 				contextWindow: 262144,
 				supportsImages: true,