fix(models): align minimax and zai defaults (#2445)

Update the coding-agent default model picks for ZAI, Cerebras,
and MiniMax so new sessions prefer the current model lineup.

Add the missing MiniMax-M2.1-highspeed direct provider entries
and normalize MiniMax Anthropic-compatible context limits so the
catalog matches the provider's supported model set.

packages/ai/scripts/generate-models.ts

@@ -914,6 +914,46 @@ async function generateModels() {
 		});
 	}
 
+	const minimaxDirectProviders = ["minimax", "minimax-cn"] as const;
+	const minimaxAnthropicIds = new Set([
+		"MiniMax-M2",
+		"MiniMax-M2.1",
+		"MiniMax-M2.1-highspeed",
+		"MiniMax-M2.5",
+		"MiniMax-M2.5-highspeed",
+		"MiniMax-M2.7",
+		"MiniMax-M2.7-highspeed",
+	]);
+
+	for (const candidate of allModels) {
+		if (
+			(candidate.provider === "minimax" || candidate.provider === "minimax-cn") &&
+			minimaxAnthropicIds.has(candidate.id)
+		) {
+			candidate.contextWindow = 204800;
+			candidate.maxTokens = 131072;
+		}
+	}
+
+	for (const provider of minimaxDirectProviders) {
+		const baseModel = allModels.find((m) => m.provider === provider && m.id === "MiniMax-M2.1");
+		if (!baseModel) continue;
+		if (allModels.some((m) => m.provider === provider && m.id === "MiniMax-M2.1-highspeed")) continue;
+
+		allModels.push({
+			...baseModel,
+			id: "MiniMax-M2.1-highspeed",
+			name: "MiniMax-M2.1-highspeed",
+			cost: {
+				...baseModel.cost,
+				input: baseModel.cost.input * 2,
+				output: baseModel.cost.output * 2,
+			},
+			contextWindow: 204800,
+			maxTokens: 131072,
+		});
+	}
+
 	// 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

@@ -4512,8 +4512,8 @@ export const MODELS = {
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
-			contextWindow: 196608,
+			contextWindow: 204800,
-			maxTokens: 128000,
+			maxTokens: 131072,
 		} satisfies Model<"anthropic-messages">,
 		"MiniMax-M2.1": {
 			id: "MiniMax-M2.1",
@@ -4532,6 +4532,23 @@ export const MODELS = {
 			contextWindow: 204800,
 			maxTokens: 131072,
 		} satisfies Model<"anthropic-messages">,
+		"MiniMax-M2.1-highspeed": {
+			id: "MiniMax-M2.1-highspeed",
+			name: "MiniMax-M2.1-highspeed",
+			api: "anthropic-messages",
+			provider: "minimax",
+			baseUrl: "https://api.minimax.io/anthropic",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 0.6,
+				output: 2.4,
+				cacheRead: 0,
+				cacheWrite: 0,
+			},
+			contextWindow: 204800,
+			maxTokens: 131072,
+		} satisfies Model<"anthropic-messages">,
 		"MiniMax-M2.5": {
 			id: "MiniMax-M2.5",
 			name: "MiniMax-M2.5",
@@ -4616,8 +4633,8 @@ export const MODELS = {
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
-			contextWindow: 196608,
+			contextWindow: 204800,
-			maxTokens: 128000,
+			maxTokens: 131072,
 		} satisfies Model<"anthropic-messages">,
 		"MiniMax-M2.1": {
 			id: "MiniMax-M2.1",
@@ -4636,6 +4653,23 @@ export const MODELS = {
 			contextWindow: 204800,
 			maxTokens: 131072,
 		} satisfies Model<"anthropic-messages">,
+		"MiniMax-M2.1-highspeed": {
+			id: "MiniMax-M2.1-highspeed",
+			name: "MiniMax-M2.1-highspeed",
+			api: "anthropic-messages",
+			provider: "minimax-cn",
+			baseUrl: "https://api.minimaxi.com/anthropic",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 0.6,
+				output: 2.4,
+				cacheRead: 0,
+				cacheWrite: 0,
+			},
+			contextWindow: 204800,
+			maxTokens: 131072,
+		} satisfies Model<"anthropic-messages">,
 		"MiniMax-M2.5": {
 			id: "MiniMax-M2.5",
 			name: "MiniMax-M2.5",

packages/coding-agent/src/core/model-resolver.ts

@@ -26,11 +26,11 @@ export const defaultModelPerProvider: Record<KnownProvider, string> = {
 	"vercel-ai-gateway": "anthropic/claude-opus-4-6",
 	xai: "grok-4-fast-non-reasoning",
 	groq: "openai/gpt-oss-120b",
-	cerebras: "zai-glm-4.6",
+	cerebras: "zai-glm-4.7",
-	zai: "glm-4.6",
+	zai: "glm-5",
 	mistral: "devstral-medium-latest",
-	minimax: "MiniMax-M2.1",
+	minimax: "MiniMax-M2.7",
-	"minimax-cn": "MiniMax-M2.1",
+	"minimax-cn": "MiniMax-M2.7",
 	huggingface: "moonshotai/Kimi-K2.5",
 	opencode: "claude-opus-4-6",
 	"opencode-go": "kimi-k2.5",

packages/coding-agent/test/model-resolver.test.ts

@@ -378,6 +378,13 @@ describe("default model selection", () => {
 		expect(defaultModelPerProvider["openai-codex"]).toBe("gpt-5.4");
 	});
 
+	test("zai, minimax, and cerebras defaults track current models", () => {
+		expect(defaultModelPerProvider.zai).toBe("glm-5");
+		expect(defaultModelPerProvider.minimax).toBe("MiniMax-M2.7");
+		expect(defaultModelPerProvider["minimax-cn"]).toBe("MiniMax-M2.7");
+		expect(defaultModelPerProvider.cerebras).toBe("zai-glm-4.7");
+	});
+
 	test("ai-gateway default is opus 4.6", () => {
 		expect(defaultModelPerProvider["vercel-ai-gateway"]).toBe("anthropic/claude-opus-4-6");
 	});