feat: add MiMo (Xiaomi) as AI provider (#887)

* feat: add MiMo (Xiaomi) as AI provider

* fix: correct MiMo default base URL, suggested models, and reasoning support

- Default base URL was the China Token Plan endpoint (tp- keys only);
  switch to https://api.xiaomimimo.com/v1 which works with standard
  pay-as-you-go sk- keys. Token Plan users can override in settings.
- Replace deprecated mimo-v2-flash suggestion with mimo-v2.5
  (v2 series was deprecated on 2026-06-30).
- Use createDeepSeek instead of createOpenAI so reasoning_content is
  passed back during multi-turn tool calls (MiMo returns 400 without
  it), matching the existing Kimi implementation.
- Add mimo to SINGLE_SYSTEM_PROVIDERS so system messages are merged.
- Fold validate-model case into the shared OpenAI-compatible group.
- Drop the Bot icon special case; models.dev serves a real xiaomi logo
  via PROVIDER_LOGO_MAP.
- Document MIMO_API_KEY/MIMO_BASE_URL in env.example and
  docs/{en,cn,ja}/ai-providers.md.

* feat: show base URL hint for MiMo in provider settings

MiMo has two endpoints tied to key type: pay-as-you-go keys (sk-...)
use the default api.xiaomimimo.com/v1, while Token Plan keys (tp-...)
require token-plan-cn.xiaomimimo.com/v1. Surface this under the Base
URL field like the existing MiniMax hint, in all four locales.

---------

Co-authored-by: mapengfei <mapengfei@srsj.com>
Co-authored-by: dayuan.jiang <jdy.toh@gmail.com>

lib/ai-providers.ts

@@ -32,6 +32,7 @@ export const SINGLE_SYSTEM_PROVIDERS = new Set<ProviderName>([
     "kimi",
     "qiniu",
     "novita",
+    "mimo",
 ])
 
 /**
@@ -116,6 +117,7 @@ const ALLOWED_CLIENT_PROVIDERS: ProviderName[] = [
     "kimi",
     "minimax",
     "novita",
+    "mimo",
 ]
 
 // Bedrock provider options for Anthropic beta features
@@ -540,7 +542,8 @@ function buildProviderOptions(
         case "qwen":
         case "kimi":
         case "qiniu":
-        case "novita": {
+        case "novita":
+        case "mimo": {
             // These providers don't have reasoning configs in AI SDK yet
             // Gateway passes through to underlying providers which handle their own configs
             break
@@ -577,6 +580,7 @@ export const PROVIDER_ENV_VARS: Record<ProviderName, string | null> = {
     kimi: "KIMI_API_KEY",
     minimax: "MINIMAX_API_KEY",
     novita: "NOVITA_API_KEY",
+    mimo: "MIMO_API_KEY",
 }
 
 /**
@@ -1346,6 +1350,23 @@ export function getAIModel(overrides?: ClientOverrides): ModelConfig {
             break
         }
 
+        case "mimo": {
+            const apiKey = resolveApiKey(overrides, "MIMO_API_KEY")
+            const baseURL = resolveBaseURL(
+                overrides?.apiKey,
+                overrides?.baseUrl,
+                resolveBaseUrlEnv(overrides, "MIMO_BASE_URL"),
+                PROVIDER_INFO.mimo?.defaultBaseUrl,
+            )
+            // Use createDeepSeek to properly handle reasoning_content for MiMo
+            // thinking models (e.g., mimo-v2.5-pro). MiMo's API requires
+            // reasoning_content to be passed back during multi-turn tool calls
+            // (returns 400 otherwise), same convention as DeepSeek and Kimi.
+            const mimoProvider = createDeepSeek({ apiKey, baseURL })
+            model = mimoProvider(modelId)
+            break
+        }
+
         case "glm":
         case "qwen":
         case "qiniu":
@@ -1393,7 +1414,7 @@ export function getAIModel(overrides?: ClientOverrides): ModelConfig {
 
         default:
             throw new Error(
-                `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter, aihubmix, deepseek, siliconflow, sglang, gateway, edgeone, doubao, modelscope, glm, qwen, qiniu, kimi, minimax, novita`,
+                `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter, aihubmix, deepseek, siliconflow, sglang, gateway, edgeone, doubao, modelscope, glm, qwen, qiniu, kimi, minimax, novita, mimo`,
             )
     }
 

lib/i18n/dictionaries/en.json

@@ -34,7 +34,8 @@
         "glm": "GLM",
         "qwen": "Qwen",
         "kimi": "Kimi",
-        "qiniu": "Qiniu"
+        "qiniu": "Qiniu",
+        "mimo": "MiMo (Xiaomi)"
     },
     "chat": {
         "placeholder": "Describe your diagram or upload a file...",
@@ -371,6 +372,7 @@
         "baseUrlWithExample": "Base URL (optional, e.g. {example})",
         "customEndpoint": "Custom endpoint URL",
         "minimaxBaseUrlHint": "Use /anthropic for Anthropic-compatible API (recommended), or /v1 for OpenAI-compatible API",
+        "mimoBaseUrlHint": "Default works with pay-as-you-go keys (sk-...). Token Plan subscribers (tp-... keys) must set https://token-plan-cn.xiaomimimo.com/v1",
         "models": "Models",
         "customModelId": "Custom model ID...",
         "allAdded": "All added",

lib/i18n/dictionaries/ja.json

@@ -34,7 +34,8 @@
         "glm": "GLM",
         "qwen": "Qwen",
         "kimi": "Kimi",
-        "qiniu": "Qiniu"
+        "qiniu": "Qiniu",
+        "mimo": "MiMo (Xiaomi)"
     },
     "chat": {
         "placeholder": "ダイアグラムを説明するか、ファイルをアップロード...",
@@ -325,6 +326,7 @@
         "baseUrlWithExample": "ベース URL（オプション、例: {example}）",
         "customEndpoint": "カスタムエンドポイント URL",
         "minimaxBaseUrlHint": "/anthropic で Anthropic 互換 API（推奨）、または /v1 で OpenAI 互換 API を使用",
+        "mimoBaseUrlHint": "デフォルトは従量課金キー（sk-...）用です。Token Plan 加入者（tp-... キー）は https://token-plan-cn.xiaomimimo.com/v1 を設定してください",
         "models": "モデル",
         "customModelId": "カスタムモデル ID...",
         "allAdded": "すべて追加済み",

lib/i18n/dictionaries/zh-Hant.json

@@ -34,7 +34,8 @@
         "glm": "GLM",
         "qwen": "Qwen",
         "kimi": "Kimi",
-        "qiniu": "Qiniu"
+        "qiniu": "Qiniu",
+        "mimo": "MiMo (小米)"
     },
     "chat": {
         "placeholder": "描述您的圖表或上傳檔案...",
@@ -371,6 +372,7 @@
         "baseUrlWithExample": "基礎 URL（可選，例如 {example}）",
         "customEndpoint": "自訂端點 URL",
         "minimaxBaseUrlHint": "使用 /anthropic 端點為 Anthropic 相容 API（推薦），或使用 /v1 端點為 OpenAI 相容 API",
+        "mimoBaseUrlHint": "預設地址適用於按量付費金鑰（sk-...）。Token Plan 訂閱用戶（tp-... 金鑰）請設定為 https://token-plan-cn.xiaomimimo.com/v1",
         "models": "模型",
         "customModelId": "自訂模型 ID...",
         "allAdded": "已全部新增",

lib/i18n/dictionaries/zh.json

@@ -34,7 +34,8 @@
         "glm": "GLM",
         "qwen": "Qwen",
         "kimi": "Kimi",
-        "qiniu": "Qiniu"
+        "qiniu": "Qiniu",
+        "mimo": "MiMo (小米)"
     },
     "chat": {
         "placeholder": "描述您的图表或上传文件...",
@@ -371,6 +372,7 @@
         "baseUrlWithExample": "基础 URL（可选，例如 {example}）",
         "customEndpoint": "自定义端点 URL",
         "minimaxBaseUrlHint": "使用 /anthropic 端点为 Anthropic 兼容 API（推荐），或使用 /v1 端点为 OpenAI 兼容 API",
+        "mimoBaseUrlHint": "默认地址适用于按量付费密钥（sk-...）。Token Plan 订阅用户（tp-... 密钥）请设置为 https://token-plan-cn.xiaomimimo.com/v1",
         "models": "模型",
         "customModelId": "自定义模型 ID...",
         "allAdded": "已全部添加",

lib/types/model-config.ts

@@ -23,6 +23,7 @@ export type ProviderName =
     | "kimi"
     | "minimax"
     | "novita"
+    | "mimo"
 
 // Individual model configuration
 export interface ModelConfig {
@@ -114,6 +115,7 @@ export const PROVIDER_LOGO_MAP: Record<string, string> = {
     modelscope: "modelscope",
     minimax: "minimax",
     novita: "novita",
+    mimo: "xiaomi",
 }
 
 // Provider metadata
@@ -200,6 +202,10 @@ export const PROVIDER_INFO: Record<
         label: "Novita AI",
         defaultBaseUrl: "https://api.novita.ai/openai",
     },
+    mimo: {
+        label: "MiMo (Xiaomi)",
+        defaultBaseUrl: "https://api.xiaomimimo.com/v1",
+    },
 }
 
 // Suggested models per provider for quick add
@@ -437,6 +443,7 @@ export const SUGGESTED_MODELS: Partial<Record<ProviderName, string[]>> = {
         "moonshotai/kimi-k2.6",
         "deepseek/deepseek-v4-flash",
     ],
+    mimo: ["mimo-v2.5-pro", "mimo-v2.5"],
 }
 
 // Helper to generate UUID