GitHub Copilot with the Langfuse AI Gateway

Create a gateway API key

Create a gateway API key under Organization settings → AI Gateway → Gateway keys. See API keys.

Point Copilot CLI at the gateway

Copilot CLI reads its BYOK provider from environment variables. See GitHub's BYOK guide.

export COPILOT_PROVIDER_BASE_URL="https://gateway.cloud.langfuse.com/anthropic"
export COPILOT_PROVIDER_TYPE="anthropic"
export COPILOT_PROVIDER_API_KEY="<your-gateway-key>"
export COPILOT_MODEL="<model-id>"   # an Anthropic model ID from /models
copilot

export COPILOT_PROVIDER_BASE_URL="https://gateway.cloud.langfuse.com/openai/v1"
export COPILOT_PROVIDER_TYPE="openai"
export COPILOT_PROVIDER_WIRE_API="responses"
export COPILOT_PROVIDER_API_KEY="<your-gateway-key>"
export COPILOT_MODEL="<model-id>"   # an OpenAI model ID from /models
copilot

To keep the setup across sessions, add the export lines to ~/.zshrc.

• The Anthropic base URL has no /v1. The OpenAI base URL includes /v1.
• Set COPILOT_PROVIDER_WIRE_API="responses" on the OpenAI route. Copilot defaults to completions (Chat Completions), which has not been verified with Copilot.
• If ~/.copilot/providers.json (or the file in COPILOT_PROVIDERS_CONFIG) already lists providers or models, it takes precedence and these variables have no effect.
• Copilot CLI cannot send custom headers to a BYOK provider, so request headers such as langfuse-tags cannot be set. Use key metadata instead.

Verify

Send a prompt in copilot. If Copilot replies, it runs through the gateway.

Create a gateway API key

Create a gateway API key under Organization settings → AI Gateway → Gateway keys. See API keys.

Add the gateway as a model provider

See GitHub's guide to adding models to the Copilot app.

1. Open Settings → Model providers, select Add provider, then choose Custom endpoint.

2. Set Display name to Langfuse.

3. Set Base URL to https://gateway.cloud.langfuse.com/openai/v1.

4. Set Wire API to responses. With completions, requests to OpenAI's GPT-5 models fail.

5. Paste your gateway key as API key. The app stores it in your OS keychain.

6. Optional: add request headers under Custom headers, for example:

   {
     "langfuse-tags": "github-copilot,<team>"
   }

7. Select Add provider. The models of your OPENAI provider credential appear in the model picker alongside the GitHub-hosted models. Select one to start a session.

Verify

Select a gateway model and send a prompt. If Copilot replies, it runs through the gateway.