@@ -48,6 +48,19 @@ export const xaiModels = {
 		includedTools: ["search_replace"],
 		excludedTools: ["apply_diff"],
 	},
+	"grok-build-0.1": {
+		maxTokens: 65_536,
+		contextWindow: 256_000,
+		supportsImages: true,
+		supportsPromptCache: true,
+		inputPrice: 1.0,
+		outputPrice: 2.0,
+		cacheWritesPrice: 0.2,
+		cacheReadsPrice: 0.2,
+		description: "xAI's Grok Build 0.1 agentic coding model with 256K context window",
+		includedTools: ["search_replace"],
+		excludedTools: ["apply_diff"],
+	},
 	"grok-4-1-fast-reasoning": {
 		maxTokens: 65_536,
 		contextWindow: 2_000_000,
 
@@ -69,6 +69,21 @@ describe("XAIHandler", () => {
 		expect(model.info).toEqual(xaiModels[testModelId])
 	})
 
+	it("should return grok-build-0.1 when specified", () => {
+		const testModelId = "grok-build-0.1"
+		const handlerWithModel = new XAIHandler({ apiModelId: testModelId })
+		const model = handlerWithModel.getModel()
+		expect(model.id).toBe(testModelId)
+		expect(model.info).toEqual(xaiModels[testModelId])
+	})
+
+	it("should return default model for an unknown model id", () => {
+		const handlerWithModel = new XAIHandler({ apiModelId: "grok-build-0.1-not-a-model" })
+		const model = handlerWithModel.getModel()
+		expect(model.id).toBe(xaiDefaultModelId)
+		expect(model.info).toEqual(xaiModels[xaiDefaultModelId])
+	})
+
 	it("should use Responses API (client.responses.create)", async () => {
 		mockResponsesCreate.mockResolvedValueOnce(asyncStreamFrom([]))