> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ccs.kaitran.ca/llms.txt
> Use this file to discover all available pages before exploring further.

# Copilot API (Deprecated)

> Deprecated GitHub Copilot compatibility integration for Claude Code

# Copilot API Integration (Deprecated)

CCS keeps [copilot-api](https://github.com/ericc-ch/copilot-api) integration
available for existing local GitHub Copilot setups. This is now deprecated
compatibility, not a recommended path for new provider setup.

<Warning>
  GitHub usage-based Copilot billing begins June 1, 2026. Prefer Codex or another
  active provider for new work.
</Warning>

## Overview

<Tabs>
  <Tab title="Dark Theme">
    <Frame>
      <img src="https://mintcdn.com/ccs-7e541244/ZIh-b3XKOoSIE-qm/assets/screenshots/copilot-api.webp?fit=max&auto=format&n=ZIh-b3XKOoSIE-qm&q=85&s=c79c8c03db6b484e7b8c20727a137725" alt="Copilot API - Dark" width="4336" height="2806" data-path="assets/screenshots/copilot-api.webp" />
    </Frame>
  </Tab>

  <Tab title="Light Theme">
    <Frame>
      <img src="https://mintcdn.com/ccs-7e541244/ZIh-b3XKOoSIE-qm/assets/screenshots/copilot-api-light.webp?fit=max&auto=format&n=ZIh-b3XKOoSIE-qm&q=85&s=10750febf398017fa8baa8d76f6ec533" alt="Copilot API - Light" width="4336" height="2806" data-path="assets/screenshots/copilot-api-light.webp" />
    </Frame>
  </Tab>
</Tabs>

<Warning>
  **Unofficial API - Use at Your Own Risk**

  * Reverse-engineered API - may break anytime
  * Excessive use may trigger account restrictions
  * No warranty, no responsibility from CCS
</Warning>

## Setup

### 1. Install copilot-api

```bash theme={null}
ccs config
# Navigate to GitHub Copilot → Install copilot-api
```

### 2. Start Daemon

The Copilot proxy runs as a local daemon on port 4141:

* **Status**: Stopped/Running indicator
* **Port**: 4141 (configurable)
* **Start/Stop**: Control buttons in dashboard

## Model Tiers

### Free Tier

No premium usage count - unlimited access:

| Model                 | Description      |
| --------------------- | ---------------- |
| **GPT-4.1 (Free)**    | General purpose  |
| **GPT-5 Mini (Free)** | Faster responses |

### Pro+ Required

Uses premium request quota from your subscription:

| Model                 | Description          |
| --------------------- | -------------------- |
| **Claude Opus 4.5**   | Complex reasoning    |
| **Claude Sonnet 4.5** | Balanced performance |
| **GPT-5.2**           | Latest GPT model     |
| **GPT-5.1 Codex Max** | Code-optimized       |
| **Gemini 2.5 Pro**    | Google's flagship    |

## Model Mapping

Configure which models handle each tier:

| Tier              | Description       | Default |
| ----------------- | ----------------- | ------- |
| **Default Model** | No tier specified | gpt-4.1 |
| **Opus**          | Complex reasoning | gpt-4.1 |
| **Sonnet**        | Balanced          | gpt-4.1 |
| **Haiku**         | Fast responses    | gpt-4.1 |

## Raw Configuration

```json theme={null}
{
  "env": {
    "ANTHROPIC_BASE_URL": "http://127.0.0.1:4141",
    "ANTHROPIC_AUTH_TOKEN": "",
    "ANTHROPIC_MODEL": "gpt-4.1",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "gpt-4.1",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "gpt-4.1",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "gpt-4.1"
  }
}
```

## Requirements

<CardGroup cols={2}>
  <Card title="GitHub Copilot" icon="github">
    Active subscription (Individual, Business, or Enterprise)
  </Card>

  <Card title="GitHub CLI" icon="terminal">
    `gh` CLI authenticated with your GitHub account
  </Card>
</CardGroup>

<Info>
  copilot-api is an open-source project. See
  [GitHub](https://github.com/ericc-ch/copilot-api) for implementation details.
</Info>