Copilot Chat CN (BYOK)

A deeply customized fork of microsoft/vscode-copilot-chat that enables BYOK (Bring Your Own Key) mode - use DeepSeek, Mimo and other OpenAI-compatible models with the full power of native Copilot features.

Chinese Docs | Changelog

Key Features

DeepSeek Reasoning Chain - Full reasoning_content multi-turn support with Thinking Effort selector UI
Custom Provider Group Labels - Display custom names in the model picker via the label field
BYOK Auto-Compression - Background conversation compaction without a Copilot subscription
Context Window Display - Correctly shows context window size for custom models
No Rate Limits - BYOK models use your own API key, bypassing Copilot quota
No-Login Mode - Works without a GitHub Copilot subscription
Rich Parameter Config - Supports temperature, top_p, top_k, reasoning_effort and more

Installation

From VS Code Marketplace

Search for "Copilot Chat CN" or "BYOK" in the VS Code Extensions panel and install.

From VSIX

Download the .vsix file from Releases
In VS Code: Ctrl+Shift+P -> Extensions: Install from VSIX...
Select the downloaded file

From Source

git clone https://github.com/ClockZinc/vscode-copilot-chat-CN.git
cd vscode-copilot-chat-CN
npm install
npm run compile
npx @vscode/vsce package --allow-package-all-secrets
code --install-extension vscode-copilot-chat-cn-*.vsix --force

Configuration

Configure your models in chatLanguageModels.json (VS Code Insiders path: %APPDATA%/Code - Insiders/User/chatLanguageModels.json):

[
  {
    "name": "my-deepseek",
    "vendor": "customoai",
    "label": "DeepSeek Official",
    "apiKey": "sk-your-api-key",
    "models": [
      {
        "id": "deepseek-v4-pro",
        "name": "DeepSeek V4 Pro",
        "url": "https://api.deepseek.com/chat/completions",
        "toolCalling": true,
        "vision": false,
        "maxInputTokens": 1000000,
        "maxOutputTokens": 384000,
        "thinking": true,
        "includeReasoning": true,
        "supportsReasoningEffort": ["high", "max"],
        "temperature": 0
      }
    ]
  },
  {
    "name": "my-mimo",
    "vendor": "customoai",
    "label": "Xiaomi MIMO",
    "apiKey": "your-mimo-api-key",
    "models": [
      {
        "id": "mimo-v2.5-pro",
        "name": "MIMO V2.5 Pro",
        "url": "https://token-plan-cn.xiaomimimo.com/v1",
        "toolCalling": true,
        "vision": true,
        "maxInputTokens": 1000000,
        "maxOutputTokens": 131072,
        "thinking": true,
        "includeReasoning": true,
        "temperature": 1,
        "top_p": 0.95
      }
    ]
  }
]

Model Configuration Fields

Field	Type	Description
`id`	string	Unique model identifier
`name`	string	Display name of the model
`url`	string	API endpoint URL
`toolCalling`	boolean	Whether the model supports tool calling
`vision`	boolean	Whether the model supports image input
`maxInputTokens`	number	Maximum input token count
`maxOutputTokens`	number	Maximum output token count
`thinking`	boolean	Whether the model supports reasoning chain
`includeReasoning`	boolean	Include `reasoning_content` in multi-turn requests (default: true)
`supportsReasoningEffort`	string[]	Supported effort levels, e.g. `["high", "max"]`
`temperature`	number	Sampling temperature (0.0 - 2.0)
`top_p`	number	Nucleus sampling parameter
`top_k`	number	Top-K sampling parameter

Provider Group Fields

Field	Description
`name`	Group name (auto-generated or manually set)
`label`	Custom display name, priority: `label` > `name` > `"CustomOAI"`
`vendor`	Must be `"customoai"`
`apiKey`	API key, supports `${{input:...}}` variables

Tested Models

Model	Provider	Thinking	Tool Calling	Vision	Status
DeepSeek V4 Pro	DeepSeek Official	Yes	Yes	No	Verified
DeepSeek V4 Flash	DeepSeek Official	Yes	Yes	No	Verified
Mimo V2.5 Pro	Xiaomi	Yes	Yes	Yes	Verified

Merging Upstream Updates

See CHANGELOG.md for detailed change descriptions and the upstream merge guide.

git remote add upstream https://github.com/microsoft/vscode-copilot-chat.git
git fetch upstream
git merge upstream/main --allow-unrelated-histories

License

This project inherits the license from the original microsoft/vscode-copilot-chat.