feat(ai): add github-copilot gpt-5.3-codex fallback closes #1853

packages/ai/scripts/generate-models.ts

@@ -844,6 +844,20 @@ async function generateModels() {
 		});
 	}
 
+	// Add missing GitHub Copilot GPT-5.3 models until models.dev includes them.
+	const copilotBaseModel = allModels.find(
+		(m) => m.provider === "github-copilot" && m.id === "gpt-5.2-codex",
+	);
+	if (copilotBaseModel) {
+		if (!allModels.some((m) => m.provider === "github-copilot" && m.id === "gpt-5.3-codex")) {
+			allModels.push({
+				...copilotBaseModel,
+				id: "gpt-5.3-codex",
+				name: "GPT-5.3 Codex",
+			});
+		}
+	}
+
 	// OpenAI Codex (ChatGPT OAuth) models
 	// NOTE: These are not fetched from models.dev; we keep a small, explicit list to avoid aliases.
 	// Context window is based on observed server limits (400s above ~272k), not marketing numbers.

packages/ai/src/models.generated.ts

@@ -2861,6 +2861,24 @@ export const MODELS = {
 			contextWindow: 272000,
 			maxTokens: 128000,
 		} satisfies Model<"openai-responses">,
+		"gpt-5.3-codex": {
+			id: "gpt-5.3-codex",
+			name: "GPT-5.3 Codex",
+			api: "openai-responses",
+			provider: "github-copilot",
+			baseUrl: "https://api.individual.githubcopilot.com",
+			headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 0,
+				output: 0,
+				cacheRead: 0,
+				cacheWrite: 0,
+			},
+			contextWindow: 272000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-responses">,
 		"grok-code-fast-1": {
 			id: "grok-code-fast-1",
 			name: "Grok Code Fast 1",
@@ -6086,6 +6104,23 @@ export const MODELS = {
 			contextWindow: 400000,
 			maxTokens: 128000,
 		} satisfies Model<"openai-responses">,
+		"gpt-5.4": {
+			id: "gpt-5.4",
+			name: "GPT-5.4",
+			api: "openai-responses",
+			provider: "opencode",
+			baseUrl: "https://opencode.ai/zen/v1",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 2.5,
+				output: 15,
+				cacheRead: 0.25,
+				cacheWrite: 0,
+			},
+			contextWindow: 1050000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-responses">,
 		"kimi-k2.5": {
 			id: "kimi-k2.5",
 			name: "Kimi K2.5",
@@ -6154,23 +6189,6 @@ export const MODELS = {
 			contextWindow: 204800,
 			maxTokens: 131072,
 		} satisfies Model<"anthropic-messages">,
-		"trinity-large-preview-free": {
-			id: "trinity-large-preview-free",
-			name: "Trinity Large Preview",
-			api: "openai-completions",
-			provider: "opencode",
-			baseUrl: "https://opencode.ai/zen/v1",
-			reasoning: false,
-			input: ["text"],
-			cost: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-			},
-			contextWindow: 131072,
-			maxTokens: 131072,
-		} satisfies Model<"openai-completions">,
 	},
 	"opencode-go": {
 		"glm-5": {
@@ -7227,7 +7245,24 @@ export const MODELS = {
 				cacheWrite: 0,
 			},
 			contextWindow: 128000,
-			maxTokens: 16384,
+			maxTokens: 32000,
+		} satisfies Model<"openai-completions">,
+		"inception/mercury-2": {
+			id: "inception/mercury-2",
+			name: "Inception: Mercury 2",
+			api: "openai-completions",
+			provider: "openrouter",
+			baseUrl: "https://openrouter.ai/api/v1",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 0.25,
+				output: 0.75,
+				cacheRead: 0.024999999999999998,
+				cacheWrite: 0,
+			},
+			contextWindow: 128000,
+			maxTokens: 50000,
 		} satisfies Model<"openai-completions">,
 		"inception/mercury-coder": {
 			id: "inception/mercury-coder",
@@ -7244,7 +7279,7 @@ export const MODELS = {
 				cacheWrite: 0,
 			},
 			contextWindow: 128000,
-			maxTokens: 16384,
+			maxTokens: 32000,
 		} satisfies Model<"openai-completions">,
 		"kwaipilot/kat-coder-pro": {
 			id: "kwaipilot/kat-coder-pro",
@@ -7952,13 +7987,13 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text", "image"],
 			cost: {
-				input: 0.44999999999999996,
+				input: 0.41,
-				output: 2.2,
+				output: 2.06,
-				cacheRead: 0.22499999999999998,
+				cacheRead: 0.07,
 				cacheWrite: 0,
 			},
 			contextWindow: 262144,
-			maxTokens: 65535,
+			maxTokens: 4096,
 		} satisfies Model<"openai-completions">,
 		"nex-agi/deepseek-v3.1-nex-n1": {
 			id: "nex-agi/deepseek-v3.1-nex-n1",
@@ -8725,6 +8760,40 @@ export const MODELS = {
 			contextWindow: 400000,
 			maxTokens: 128000,
 		} satisfies Model<"openai-completions">,
+		"openai/gpt-5.4": {
+			id: "openai/gpt-5.4",
+			name: "OpenAI: GPT-5.4",
+			api: "openai-completions",
+			provider: "openrouter",
+			baseUrl: "https://openrouter.ai/api/v1",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 2.5,
+				output: 15,
+				cacheRead: 0.25,
+				cacheWrite: 0,
+			},
+			contextWindow: 1050000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
+		"openai/gpt-5.4-pro": {
+			id: "openai/gpt-5.4-pro",
+			name: "OpenAI: GPT-5.4 Pro",
+			api: "openai-completions",
+			provider: "openrouter",
+			baseUrl: "https://openrouter.ai/api/v1",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 30,
+				output: 180,
+				cacheRead: 0,
+				cacheWrite: 0,
+			},
+			contextWindow: 1050000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
 		"openai/gpt-oss-120b": {
 			id: "openai/gpt-oss-120b",
 			name: "OpenAI: gpt-oss-120b",
@@ -10264,9 +10333,9 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text"],
 			cost: {
-				input: 0.7999999999999999,
+				input: 0.6,
-				output: 2.56,
+				output: 1.9,
-				cacheRead: 0.16,
+				cacheRead: 0.119,
 				cacheWrite: 0,
 			},
 			contextWindow: 202752,
@@ -11974,6 +12043,40 @@ export const MODELS = {
 			contextWindow: 400000,
 			maxTokens: 128000,
 		} satisfies Model<"anthropic-messages">,
+		"openai/gpt-5.4": {
+			id: "openai/gpt-5.4",
+			name: "GPT 5.4",
+			api: "anthropic-messages",
+			provider: "vercel-ai-gateway",
+			baseUrl: "https://ai-gateway.vercel.sh",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 2.5,
+				output: 15,
+				cacheRead: 0.25,
+				cacheWrite: 0,
+			},
+			contextWindow: 1050000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
+		"openai/gpt-5.4-pro": {
+			id: "openai/gpt-5.4-pro",
+			name: "GPT 5.4 Pro",
+			api: "anthropic-messages",
+			provider: "vercel-ai-gateway",
+			baseUrl: "https://ai-gateway.vercel.sh",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 30,
+				output: 180,
+				cacheRead: 0,
+				cacheWrite: 0,
+			},
+			contextWindow: 1050000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
 		"openai/gpt-oss-120b": {
 			id: "openai/gpt-oss-120b",
 			name: "gpt-oss-120b",

packages/ai/test/stream.test.ts

@@ -490,26 +490,6 @@ describe("Generate E2E Tests", () => {
 		});
 	});
 
-	describe.skipIf(!process.env.OPENAI_API_KEY)("OpenAI Responses Provider (gpt-5-mini)", () => {
-		const model = getModel("openai", "gpt-5-mini");
-
-		it("should complete basic text generation", { retry: 3 }, async () => {
-			await basicTextGeneration(model);
-		});
-
-		it("should handle tool calling", { retry: 3 }, async () => {
-			await handleToolCall(model);
-		});
-
-		it("should handle streaming", { retry: 3 }, async () => {
-			await handleStreaming(model);
-		});
-
-		it("should handle image input", { retry: 3 }, async () => {
-			await handleImage(model);
-		});
-	});
-
 	describe.skipIf(!hasAzureOpenAICredentials())("Azure OpenAI Responses Provider (gpt-4o-mini)", () => {
 		const llm = getModel("azure-openai-responses", "gpt-4o-mini");
 		const azureDeploymentName = resolveAzureDeploymentName(llm.id);
@@ -934,8 +914,8 @@ describe("Generate E2E Tests", () => {
 		});
 	});
 
-	describe("GitHub Copilot Provider (gpt-4o via OpenAI Completions)", () => {
+	describe("GitHub Copilot Provider (gpt-5.3-codex via OpenAI Completions)", () => {
-		const llm = getModel("github-copilot", "gpt-4o");
+		const llm = getModel("github-copilot", "gpt-5.3-codex");
 
 		it.skipIf(!githubCopilotToken)("should complete basic text generation", { retry: 3 }, async () => {
 			await basicTextGeneration(llm, { apiKey: githubCopilotToken });