API Reference

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All endpoints listen on http://<address>:<port> (default http://127.0.0.1:8314). No API key is required by the proxy itself — authentication to GitHub Copilot is handled internally.

Endpoints

Method & path Description
POST /v1/chat/completions OpenAI chat completions (also /chat/completions)
POST /v1/responses OpenAI Responses API for Codex (also /responses)
POST /v1/messages Anthropic Messages API
POST /v1/messages/count_tokens Anthropic token counting (real BPE)
POST /v1/embeddings Embeddings (also /embeddings)
GET /v1/models List available models (also /models, /api/models)
GET /v1/models/full/ Raw upstream model catalog with capabilities
GET /usage Copilot plan and quota usage
GET / Web analytics dashboard
GET /requests Request browser
GET /api/stats Dashboard statistics (JSON)
GET /api/requests Recent requests (JSON)

Streaming (SSE) is supported on the chat, responses, and messages endpoints by setting "stream": true in the request body.

OpenAI SDK

from openai import OpenAI

client = OpenAI(base_url="http://127.0.0.1:8314/v1", api_key="not-needed")
resp = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)

Anthropic SDK

import anthropic

client = anthropic.Anthropic(base_url="http://127.0.0.1:8314", api_key="not-needed")
msg = client.messages.create(
    model="claude-sonnet-4",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}],
)
print(msg.content)

The proxy serves Anthropic requests directly from Copilot’s native /v1/messages endpoint when the model supports it, and otherwise translates them through chat completions transparently.

cURL

# Chat completions
curl http://127.0.0.1:8314/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-4o", "messages": [{"role": "user", "content": "Hello!"}]}'

# List models
curl http://127.0.0.1:8314/v1/models

# Usage / quota
curl http://127.0.0.1:8314/usage

Model discovery

GET /v1/models returns the OpenAI-style list. For full capability data — context-window limits, supported endpoints, vision, tokenizer — use:

curl http://127.0.0.1:8314/v1/models/full/

This is the authoritative source for which models support a 1M-token context window (those advertising max_context_window_tokens greater than 200,000).

Notable behaviors