diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index 090736729..705358967 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -75,6 +75,7 @@
 
 ### Fixed
 
+- Fixed GitHub Copilot Grok 4.5 requests to use the supported Responses API ([#7560](https://github.com/earendil-works/pi/issues/7560)).
 - Bounded OAuth token refreshes so stalled requests release the credential-store lock ([#7508](https://github.com/earendil-works/pi/issues/7508)).
 - Fixed tool argument validation to preserve values that already match an `anyOf`/`oneOf` union arm before attempting coercion, avoiding nullable unions converting `null` to another primitive value ([#7328](https://github.com/earendil-works/pi/issues/7328)).
 - Fixed cancellation of model catalog refreshes so callers stop waiting even when a custom provider ignores its abort signal ([#7027](https://github.com/earendil-works/pi/issues/7027)).
diff --git a/packages/ai/scripts/generate-models.ts b/packages/ai/scripts/generate-models.ts
index 5f2ea81f7..b881c6c3e 100644
--- a/packages/ai/scripts/generate-models.ts
+++ b/packages/ai/scripts/generate-models.ts
@@ -1862,10 +1862,13 @@ async function loadModelsDevData(): Promise<Model<any>[]> {
 
 				// Claude 4.x and 5.x models route to Anthropic Messages API
 				const isCopilotClaude = /^claude-(haiku|sonnet|opus)-[45]([.\-]|$)/.test(modelId);
-				// gpt-5, oswe, and MAI-Code models are only served through the
-				// Copilot /responses endpoint.
+				// Grok 4.5, gpt-5, oswe, and MAI-Code models are only served through
+				// the Copilot /responses endpoint.
 				const needsResponsesApi =
-					modelId.startsWith("gpt-5") || modelId.startsWith("oswe") || modelId.startsWith("mai-");
+					modelId === "grok-4.5" ||
+					modelId.startsWith("gpt-5") ||
+					modelId.startsWith("oswe") ||
+					modelId.startsWith("mai-");
 
 				const api: Api = isCopilotClaude
 					? "anthropic-messages"
diff --git a/packages/ai/test/model-catalog-types.test.ts b/packages/ai/test/model-catalog-types.test.ts
index b3c47658e..0facda3db 100644
--- a/packages/ai/test/model-catalog-types.test.ts
+++ b/packages/ai/test/model-catalog-types.test.ts
@@ -1,4 +1,5 @@
-import { expectTypeOf, it } from "vitest";
+import { expect, expectTypeOf, it } from "vitest";
+import { GITHUB_COPILOT_MODELS } from "../src/providers/github-copilot.models.ts";
 import { XAI_MODELS } from "../src/providers/xai.models.ts";
 
 it("derives model API, ID, and provider literals from grouped model data", () => {
@@ -7,3 +8,8 @@ it("derives model API, ID, and provider literals from grouped model data", () =>
 	expectTypeOf(XAI_MODELS["grok-4.5"].provider).toEqualTypeOf<"xai">();
 	expectTypeOf(XAI_MODELS["grok-4.3"].api).toEqualTypeOf<"openai-completions">();
 });
+
+it("routes GitHub Copilot Grok 4.5 through the Responses API", () => {
+	expectTypeOf(GITHUB_COPILOT_MODELS["grok-4.5"].api).toEqualTypeOf<"openai-responses">();
+	expect(GITHUB_COPILOT_MODELS["grok-4.5"].api).toBe("openai-responses");
+});
diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index b20d8ae21..6382adf7b 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -84,6 +84,7 @@
 
 ### Fixed
 
+- Fixed inherited GitHub Copilot Grok 4.5 requests to use the supported Responses API ([#7560](https://github.com/earendil-works/pi/issues/7560)).
 - Fixed fullscreen shutdown leaking terminal capability-query replies into the parent shell prompt.
 - Fixed bare exact `--model` IDs shared by multiple providers choosing the first catalog entry instead of the sole authenticated provider or a clear ambiguity error ([#7327](https://github.com/earendil-works/pi/issues/7327)).
 - Fixed standalone x64 binaries requiring Haswell-era AVX2/BMI2 instructions by compiling release executables against Bun's baseline runtime ([#7149](https://github.com/earendil-works/pi/issues/7149)).