feat(ai,coding-agent): add new Copilot models

packages/ai/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 
+- Added Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna to the GitHub Copilot catalog.
 - Added GPT-6 Sol and GPT-6 Luna for OpenAI API keys and OpenAI Codex subscriptions, with full reasoning-effort, prompt-caching, tool-search, long-context pricing, and official cost metadata.
 - Added Claude Opus 5.5 to the built-in Anthropic model catalog with adaptive thinking, 1M context, and official pricing metadata.
 - Added Grok 4.7 to the built-in xAI model catalog with long-context pricing metadata.

packages/ai/scripts/generate-models.ts

@@ -488,11 +488,15 @@ const GITHUB_COPILOT_EXTENDED_CONTEXT_MODELS = new Set([
 	"claude-opus-4.7",
 	"claude-opus-4.8",
 	"claude-opus-5",
+	"claude-opus-5.5",
 	"claude-sonnet-4.6",
 	"claude-sonnet-5",
 	"gpt-5.3-codex",
 	"gpt-5.4",
 	"gpt-5.5",
+	"gpt-6-astra",
+	"gpt-6-luna",
+	"gpt-6-sol",
 ]);
 
 // Checked manually against the authenticated GitHub Copilot /models endpoint on 2026-06-15.
@@ -2702,6 +2706,51 @@ async function generateModels() {
 		});
 	}
 
+	// The authenticated Copilot catalog advertised these models on 2026-09-22,
+	// but models.dev did not include them yet.
+	const missingCopilotModels: Model<Api>[] = [
+		{
+			id: "claude-opus-5.5",
+			name: "Claude Opus 5.5",
+			api: "anthropic-messages",
+			provider: "github-copilot",
+			baseUrl: "https://api.individual.githubcopilot.com",
+			reasoning: true,
+			thinkingLevelMap: {
+				off: null,
+				minimal: null,
+				low: "low",
+				medium: "medium",
+				high: "high",
+				xhigh: "xhigh",
+				max: "max",
+			},
+			input: ["text", "image"],
+			cost: { input: 4, output: 20, cacheRead: 0.2, cacheWrite: 5 },
+			contextWindow: 1000000,
+			maxTokens: 128000,
+			headers: { ...COPILOT_STATIC_HEADERS },
+		},
+		...(["gpt-6-sol", "gpt-6-luna"] as const).map((id) => ({
+			id,
+			name: id === "gpt-6-sol" ? "GPT-6 Sol" : "GPT-6 Luna",
+			api: "openai-responses" as const,
+			provider: "github-copilot" as const,
+			baseUrl: "https://api.individual.githubcopilot.com",
+			reasoning: true,
+			input: ["text", "image"] as ("text" | "image")[],
+			cost: withOpenAiLongContextPricing(OPENAI_STANDARD_COSTS[id]),
+			contextWindow: 1000000,
+			maxTokens: 128000,
+			headers: { ...COPILOT_STATIC_HEADERS },
+		})),
+	];
+	for (const model of missingCopilotModels) {
+		if (!allModels.some((candidate) => candidate.provider === model.provider && candidate.id === model.id)) {
+			allModels.push(model);
+		}
+	}
+
 	// Temporary overrides until upstream model metadata is corrected.
 	for (const candidate of allModels) {
 		if (candidate.provider === "github-copilot" && GITHUB_COPILOT_EXTENDED_CONTEXT_MODELS.has(candidate.id)) {

packages/ai/test/github-copilot-anthropic.test.ts

@@ -69,6 +69,11 @@ describe("Copilot Claude via Anthropic Messages", () => {
 		expect(getSupportedThinkingLevels(opus5)).toContain("xhigh");
 		expect(getSupportedThinkingLevels(opus5)).toContain("max");
 
+		const opus55 = getModel("github-copilot", "claude-opus-5.5");
+		expect(opus55.api).toBe("anthropic-messages");
+		expect(opus55.contextWindow).toBe(1000000);
+		expect(getSupportedThinkingLevels(opus55)).toEqual(["low", "medium", "high", "xhigh", "max"]);
+
 		const sonnet46 = getModel("github-copilot", "claude-sonnet-4.6");
 		expect(sonnet46.thinkingLevelMap).toMatchObject({ minimal: "low", max: "max" });
 		expect(getSupportedThinkingLevels(sonnet46)).toContain("max");

packages/ai/test/model-catalog-types.test.ts

@@ -24,4 +24,14 @@ it("routes all GitHub Copilot GPT models through the Responses API", () => {
 	expect(gptModels.length).toBeGreaterThan(0);
 	expect(gptModels.every((model) => model.api === "openai-responses")).toBe(true);
 	expectTypeOf(GITHUB_COPILOT_MODELS["gpt-6-astra"].api).toEqualTypeOf<"openai-responses">();
+	for (const modelId of ["gpt-6-sol", "gpt-6-luna"] as const) {
+		const model = GITHUB_COPILOT_MODELS[modelId];
+		expectTypeOf(model.api).toEqualTypeOf<"openai-responses">();
+		expect(model).toMatchObject({
+			api: "openai-responses",
+			contextWindow: 1000000,
+			maxTokens: 128000,
+			thinkingLevelMap: { off: "none", max: "max" },
+		});
+	}
 });

packages/coding-agent/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 
+- Added inherited Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna support for GitHub Copilot.
 - Added inherited GPT-6 Sol and GPT-6 Luna support for OpenAI API keys and OpenAI Codex subscriptions.
 - Added inherited Claude Opus 5.5 support for Anthropic with adaptive thinking and a 1M context window.