fix: add model ID mapping for MiniMax China endpoint (minimaxi.com)

- Map MiniMax-M2 to abab7-chat for China endpoint
- Map MiniMax-M2-Stable to abab7-chat-hd for China endpoint
- Override createStream and completePrompt methods to handle model mapping
- Add comprehensive tests for both endpoints

Fixes #9100

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

@@ -131,6 +131,79 @@ describe("MiniMaxHandler", () => {
 			expect(model.id).toBe(minimaxDefaultModelId)
 			expect(model.info).toEqual(minimaxModels[minimaxDefaultModelId])
 		})
+
+		it("should map MiniMax-M2 to abab7-chat for China endpoint", async () => {
+			const handlerWithModel = new MiniMaxHandler({
+				apiModelId: "MiniMax-M2",
+				minimaxApiKey: "test-minimax-api-key",
+				minimaxBaseUrl: "https://api.minimaxi.com/v1",
+			})
+
+			mockCreate.mockImplementationOnce(() => {
+				return {
+					[Symbol.asyncIterator]: () => ({
+						async next() {
+							return { done: true }
+						},
+					}),
+				}
+			})
+
+			const messageGenerator = handlerWithModel.createMessage("test", [])
+			await messageGenerator.next()
+
+			expect(mockCreate).toHaveBeenCalledWith(
+				expect.objectContaining({
+					model: "abab7-chat", // Mapped model ID for China endpoint
+				}),
+				undefined,
+			)
+		})
+
+		it("should map MiniMax-M2-Stable to abab7-chat-hd for China endpoint", async () => {
+			const handlerWithModel = new MiniMaxHandler({
+				apiModelId: "MiniMax-M2-Stable",
+				minimaxApiKey: "test-minimax-api-key",
+				minimaxBaseUrl: "https://api.minimaxi.com/v1",
+			})
+
+			mockCreate.mockImplementationOnce(() => {
+				return {
+					[Symbol.asyncIterator]: () => ({
+						async next() {
+							return { done: true }
+						},
+					}),
+				}
+			})
+
+			const messageGenerator = handlerWithModel.createMessage("test", [])
+			await messageGenerator.next()
+
+			expect(mockCreate).toHaveBeenCalledWith(
+				expect.objectContaining({
+					model: "abab7-chat-hd", // Mapped model ID for China endpoint
+				}),
+				undefined,
+			)
+		})
+
+		it("should map model ID correctly in completePrompt for China endpoint", async () => {
+			const handlerWithModel = new MiniMaxHandler({
+				apiModelId: "MiniMax-M2",
+				minimaxApiKey: "test-minimax-api-key",
+				minimaxBaseUrl: "https://api.minimaxi.com/v1",
+			})
+
+			mockCreate.mockResolvedValueOnce({ choices: [{ message: { content: "test response" } }] })
+			await handlerWithModel.completePrompt("test prompt")
+
+			expect(mockCreate).toHaveBeenCalledWith(
+				expect.objectContaining({
+					model: "abab7-chat", // Mapped model ID for China endpoint
+				}),
+			)
+		})
 	})
 
 	describe("Default behavior", () => {
@@ -258,6 +331,35 @@ describe("MiniMaxHandler", () => {
 			)
 		})
 
+		it("should not apply model ID mapping for international endpoint", async () => {
+			const modelId: MinimaxModelId = "MiniMax-M2"
+			const handlerWithModel = new MiniMaxHandler({
+				apiModelId: modelId,
+				minimaxApiKey: "test-minimax-api-key",
+				minimaxBaseUrl: "https://api.minimax.io/v1",
+			})
+
+			mockCreate.mockImplementationOnce(() => {
+				return {
+					[Symbol.asyncIterator]: () => ({
+						async next() {
+							return { done: true }
+						},
+					}),
+				}
+			})
+
+			const messageGenerator = handlerWithModel.createMessage("test", [])
+			await messageGenerator.next()
+
+			expect(mockCreate).toHaveBeenCalledWith(
+				expect.objectContaining({
+					model: modelId, // Original model ID for international endpoint
+				}),
+				undefined,
+			)
+		})
+
 		it("should use temperature 1 by default", async () => {
 			mockCreate.mockImplementationOnce(() => {
 				return {

src/api/providers/minimax.ts

@@ -1,19 +1,105 @@
+import { Anthropic } from "@anthropic-ai/sdk"
+import OpenAI from "openai"
+
 import { type MinimaxModelId, minimaxDefaultModelId, minimaxModels } from "@roo-code/types"
 
 import type { ApiHandlerOptions } from "../../shared/api"
+import { getModelMaxOutputTokens } from "../../shared/api"
+import { convertToOpenAiMessages } from "../transform/openai-format"
+import { handleOpenAIError } from "./utils/openai-error-handler"
+import type { ApiHandlerCreateMessageMetadata } from "../index"
 
 import { BaseOpenAiCompatibleProvider } from "./base-openai-compatible-provider"
 
 export class MiniMaxHandler extends BaseOpenAiCompatibleProvider<MinimaxModelId> {
+	private readonly isChinaEndpoint: boolean
+
 	constructor(options: ApiHandlerOptions) {
+		const baseURL = options.minimaxBaseUrl ?? "https://api.minimax.io/v1"
+		const isChinaEndpoint = baseURL.includes("minimaxi.com")
+
 		super({
 			...options,
 			providerName: "MiniMax",
-			baseURL: options.minimaxBaseUrl ?? "https://api.minimax.io/v1",
+			baseURL,
 			apiKey: options.minimaxApiKey,
 			defaultProviderModelId: minimaxDefaultModelId,
 			providerModels: minimaxModels,
 			defaultTemperature: 1.0,
 		})
+
+		this.isChinaEndpoint = isChinaEndpoint
+	}
+
+	// Override createStream to handle model ID mapping for China endpoint
+	protected override createStream(
+		systemPrompt: string,
+		messages: Anthropic.Messages.MessageParam[],
+		metadata?: ApiHandlerCreateMessageMetadata,
+		requestOptions?: OpenAI.RequestOptions,
+	) {
+		const { id: modelId, info } = this.getModel()
+
+		// Map model IDs for China endpoint - they use different model names
+		let apiModelId = modelId as string
+		if (this.isChinaEndpoint) {
+			const chinaModelMapping: Record<string, string> = {
+				"MiniMax-M2": "abab7-chat",
+				"MiniMax-M2-Stable": "abab7-chat-hd",
+			}
+			apiModelId = chinaModelMapping[modelId] || modelId.toLowerCase()
+		}
+
+		// Centralized cap: clamp to 20% of the context window (unless provider-specific exceptions apply)
+		const max_tokens =
+			getModelMaxOutputTokens({
+				modelId,
+				model: info,
+				settings: this.options,
+				format: "openai",
+			}) ?? undefined
+
+		const temperature = this.options.modelTemperature ?? 1.0
+
+		const params: OpenAI.Chat.Completions.ChatCompletionCreateParamsStreaming = {
+			model: apiModelId,
+			max_tokens,
+			temperature,
+			messages: [{ role: "system", content: systemPrompt }, ...convertToOpenAiMessages(messages)],
+			stream: true,
+			stream_options: { include_usage: true },
+		}
+
+		try {
+			return this.client.chat.completions.create(params, requestOptions)
+		} catch (error) {
+			throw handleOpenAIError(error, this.providerName)
+		}
+	}
+
+	// Override completePrompt to handle model ID mapping for China endpoint
+	override async completePrompt(prompt: string): Promise<string> {
+		const { id: modelId } = this.getModel()
+
+		// Map model IDs for China endpoint
+		let apiModelId = modelId as string
+		if (this.isChinaEndpoint) {
+			const chinaModelMapping: Record<string, string> = {
+				"MiniMax-M2": "abab7-chat",
+				"MiniMax-M2-Stable": "abab7-chat-hd",
+			}
+			apiModelId = chinaModelMapping[modelId] || modelId.toLowerCase()
+		}
+
+		try {
+			const response = await this.client.chat.completions.create({
+				model: apiModelId,
+				messages: [{ role: "user", content: prompt }],
+			})
+
+			return response.choices[0]?.message.content || ""
+		} catch (error) {
+			throw handleOpenAIError(error, this.providerName)
+		}
 	}
 }