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fix: disable thinking chain for Xiaomi MiMo models #143

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AmintaCCCP merged 1 commit into from
May 13, 2026
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fix: disable thinking chain for Xiaomi MiMo models #143

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7 changes: 7 additions & 0 deletions src/services/aiService.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,10 @@ export class AIService {
return this.getApiType() === 'openai' && this.config.model.trim() === 'deepseek-reasoner';
}

private isMiMoModel(): boolean {
return this.config.model.trim().toLowerCase().includes('mimo');
}

private async requestText(options: {
system: string;
user: string;
Expand All @@ -97,6 +101,7 @@ export class AIService {
{ role: 'user', content: options.user },
];
const isDeepSeekReasoner = this.isDeepSeekReasonerModel();
const isMiMoModel = this.isMiMoModel();

const requestBody = apiType === 'openai-responses'
? {
Expand All @@ -105,13 +110,15 @@ export class AIService {
temperature: options.temperature,
max_output_tokens: options.maxTokens,
...(reasoning ? { reasoning } : {}),
...(isMiMoModel ? { thinking: { type: 'disabled' } } : {}),
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@coderabbitai coderabbitai Bot May 13, 2026

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⚠️ Potential issue | 🔴 Critical | ⚡ Quick win

🧩 Analysis chain

🌐 Web query:

Xiaomi MiMo API thinking parameter format and valid values

💡 Result:

The Xiaomi MiMo API (OpenAI-compatible /v1/chat/completions endpoint) supports a "thinking" parameter to enable the model's reasoning mode, which outputs reasoning_content in responses alongside content or tool_calls [1][2]. Parameter formats and valid values from sources: 1. Object format (Xiaomi API docs): thinking: { type: "enabled" } [1] 2. Boolean flag in chat_template_kwargs (local/self-hosted MiMo-V2-Flash): "chat_template_kwargs": { "enable_thinking": true } [2] 3. Boolean in extra_body (API wrappers): extra_body={"enable_thinking": True} [3] When enabled, responses include reasoning_content (persist it in messages for multi-turn consistency, especially with tools) [2]. Different providers (e.g., api.xiaomimimo.com, self-hosted, OpenRouter) vary slightly in param location but use true/enabled to activate [1][2][4][3]. No explicit "disabled" values documented beyond omitting the param.

Citations:

🏁 Script executed:

#!/bin/bash
# Description: Search for MiMo-related configuration and API type usage

echo "=== Checking API type configurations ==="
rg -n "apiType.*openai" --type=ts --type=json -C3

echo -e "\n=== Checking for MiMo-related comments or documentation ==="
rg -n -i "mimo|xiaomi" --type=ts --type=md -C2

Repository: AmintaCCCP/GithubStarsManager

Length of output: 15219

Remove the undocumented thinking: { type: 'disabled' } parameter — it's not supported by Xiaomi MiMo API.

The official Xiaomi MiMo API documentation only documents thinking: { type: "enabled" } to activate reasoning mode. The "disabled" value is not part of the API specification. The correct approach to disable thinking is to omit the parameter entirely, which the code already does when isMiMoModel is false.

Either remove lines 113 and 121 or conditionally add thinking: { type: "enabled" } only when thinking should be enabled.

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@src/services/aiService.ts` at line 113, The code currently injects thinking:
{ type: 'disabled' } for MiMo models (see isMiMoModel usage in
src/services/aiService.ts), which is not supported; remove the disabled branch
so the thinking field is omitted by default and instead only set thinking: {
type: 'enabled' } when you explicitly want reasoning on. Concretely, update the
object construction around the isMiMoModel conditional (the spread currently
producing thinking: { type: 'disabled' }) to either remove that spread entirely
or change the logic to add thinking: { type: 'enabled' } only when a separate
"enableThinking" flag is true.

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@AmintaCCCP AmintaCCCP May 13, 2026

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感谢审计，但这个结论是错误的。

官方文档明确支持 thinking: { type: "disabled" }

根据小米 MiMo API 官方文档（https://platform.xiaomimimo.com/static/docs/api/chat/openai-api.md），`thinking` 参数的 type 字段支持两个值：

"type": "string", 
"description": "Whether to enable the chain of thought.
  - mimo-v2-flash: default disabled
  - mimo-v2.5-pro, mimo-v2.5, mimo-v2-pro, mimo-v2-omni: default enabled
  Available options: enabled, disabled"

关键点：

  • ✅ thinking: { type: "disabled" } 是官方支持的参数值
  • ✅ thinking: { type: "enabled" } 也是官方支持的参数值
  • ⚠️ 不同模型默认值不同：
    • mimo-v2-flash: 默认 disabled
    • mimo-v2.5-pro, mimo-v2.5 等: 默认 enabled

为什么需要显式禁用？

对于默认 enabled 的模型（如 mimo-v2.5-pro），如果不显式传 thinking: { type: "disabled" }，模型会返回 reasoning_content 字段，这正是 issue #127 报告的问题。

结论

当前代码是正确的，不需要修改。CodeRabbit 搜索的文档不完整，没有找到 disabled 选项的说明。

}
: {
model: this.config.model,
messages,
max_tokens: options.maxTokens,
...(!isDeepSeekReasoner ? { temperature: options.temperature } : {}),
...(!isDeepSeekReasoner && reasoning && apiType !== 'openai-compatible' ? { reasoning } : {}),
...(isMiMoModel ? { thinking: { type: 'disabled' } } : {}),
};

let data: Record<string, unknown>;
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