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Integrate with GitHub Copilot CLI

Configure GitHub Copilot CLI to use DeepSeek V4 models via BYOK (Bring Your Own Key) with the Anthropic-compatible endpoint.

Important: Use anthropic as the provider type. The openai type triggers a 400 error: The reasoning_content in the thinking mode must be passed back to the API. — DeepSeek requires reasoning_content to be echoed back on subsequent requests, which Copilot CLI's OpenAI integration does not support. The Anthropic Messages API endpoint avoids this issue entirely.

1. Install GitHub Copilot CLI

npm install -g @github/copilot

Requires Node.js 22 or later. See the official getting-started guide for details.

2. Get a DeepSeek API Key

3. Configure Environment Variables

Linux / Mac:

export COPILOT_PROVIDER_TYPE=anthropic
export COPILOT_PROVIDER_BASE_URL=https://api.deepseek.com/anthropic
export COPILOT_PROVIDER_API_KEY=sk-your-deepseek-api-key
export COPILOT_MODEL=deepseek-v4-pro

Windows (PowerShell):

$env:COPILOT_PROVIDER_TYPE="anthropic"
$env:COPILOT_PROVIDER_BASE_URL="https://api.deepseek.com/anthropic"
$env:COPILOT_PROVIDER_API_KEY="sk-your-deepseek-api-key"
$env:COPILOT_MODEL="deepseek-v4-pro"

Available models: deepseek-v4-pro, deepseek-v4-flash. Switch by changing COPILOT_MODEL.

4. Start Copilot CLI

copilot

Full agent mode, tool calling, and MCP support — all powered by DeepSeek.

Optional: Token Limits

Since deepseek-v4-pro is not in Copilot CLI's built-in model catalog, configure the token limits explicitly:

Linux / Mac:

export COPILOT_PROVIDER_MAX_PROMPT_TOKENS=840000
export COPILOT_PROVIDER_MAX_OUTPUT_TOKENS=128000

Windows (PowerShell):

$env:COPILOT_PROVIDER_MAX_PROMPT_TOKENS="840000"
$env:COPILOT_PROVIDER_MAX_OUTPUT_TOKENS="128000"

Run copilot help providers for all available environment variables.

Optional: Offline Mode

Linux / Mac:

export COPILOT_OFFLINE=true

Windows (PowerShell):

$env:COPILOT_OFFLINE="true"

Note: your prompts still go to api.deepseek.com — offline mode only blocks GitHub's API calls.

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