feat: add zai-glm-4.6 model to Cerebras and set gpt-oss-120b as default (#8920)

* feat: add zai-glm-4.6 model and update gpt-oss-120b for Cerebras

- Add zai-glm-4.6 with 128K context window and 40K max tokens
- Set zai-glm-4.6 as default Cerebras model
- Update gpt-oss-120b to 128K context and 40K max tokens

* feat: add zai-glm-4.6 model to Cerebras provider

- Add zai-glm-4.6 with 128K context window and 40K max tokens
- Set zai-glm-4.6 as default Cerebras model
- Model provides ~2000 tokens/s for general-purpose tasks

* add [SOON TO BE DEPRECATED] warning for Q3C

* chore: set gpt-oss-120b as default Cerebras model

* Fix cerebras test: update expected default model to gpt-oss-120b

* Apply suggestion from @mrubens

Co-authored-by: Matt Rubens <[email protected]>

---------

Co-authored-by: kevint-cerebras <[email protected]>
Co-authored-by: Matt Rubens <[email protected]>

packages/types/src/providers/cerebras.ts

@@ -3,9 +3,18 @@ import type { ModelInfo } from "../model.js"
 // https://inference-docs.cerebras.ai/api-reference/chat-completions
 export type CerebrasModelId = keyof typeof cerebrasModels
 
-export const cerebrasDefaultModelId: CerebrasModelId = "qwen-3-coder-480b-free"
+export const cerebrasDefaultModelId: CerebrasModelId = "gpt-oss-120b"
 
 export const cerebrasModels = {
+	"zai-glm-4.6": {
+		maxTokens: 16_384,
+		contextWindow: 128000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		description: "Highly intelligent general-purpose model with ~2000 tokens/s",
+	},
 	"qwen-3-coder-480b-free": {
 		maxTokens: 40000,
 		contextWindow: 64000,
@@ -14,7 +23,7 @@ export const cerebrasModels = {
 		inputPrice: 0,
 		outputPrice: 0,
 		description:
-			"SOTA coding model with ~2000 tokens/s ($0 free tier)\n\n• Use this if you don't have a Cerebras subscription\n• 64K context window\n• Rate limits: 150K TPM, 1M TPH/TPD, 10 RPM, 100 RPH/RPD\n\nUpgrade for higher limits: [https://cloud.cerebras.ai/?utm=roocode](https://cloud.cerebras.ai/?utm=roocode)",
+			"[SOON TO BE DEPRECATED] SOTA coding model with ~2000 tokens/s ($0 free tier)\n\n• Use this if you don't have a Cerebras subscription\n• 64K context window\n• Rate limits: 150K TPM, 1M TPH/TPD, 10 RPM, 100 RPH/RPD\n\nUpgrade for higher limits: [https://cloud.cerebras.ai/?utm=roocode](https://cloud.cerebras.ai/?utm=roocode)",
 	},
 	"qwen-3-coder-480b": {
 		maxTokens: 40000,
@@ -24,7 +33,7 @@ export const cerebrasModels = {
 		inputPrice: 0,
 		outputPrice: 0,
 		description:
-			"SOTA coding model with ~2000 tokens/s ($50/$250 paid tiers)\n\n• Use this if you have a Cerebras subscription\n• 131K context window with higher rate limits",
+			"[SOON TO BE DEPRECATED] SOTA coding model with ~2000 tokens/s ($50/$250 paid tiers)\n\n• Use this if you have a Cerebras subscription\n• 131K context window with higher rate limits",
 	},
 	"qwen-3-235b-a22b-instruct-2507": {
 		maxTokens: 64000,

src/api/providers/__tests__/cerebras.spec.ts

@@ -56,7 +56,7 @@ describe("CerebrasHandler", () => {
 		it("should fallback to default model when apiModelId is not provided", () => {
 			const handlerWithoutModel = new CerebrasHandler({ cerebrasApiKey: "test" })
 			const { id } = handlerWithoutModel.getModel()
-			expect(id).toBe("qwen-3-coder-480b") // cerebrasDefaultModelId (routed)
+			expect(id).toBe("gpt-oss-120b") // cerebrasDefaultModelId
 		})
 	})