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Use your own API keys for cost control and billing transparency with official OpenAI and Anthropic models.

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Configuration

Configuration examples for ~/.factory/config.json: 
{
  "custom_models": [
    {
      "model_display_name": "Sonnet 4.5 [Custom]",
      "model": "claude-sonnet-4-5-20250929",
      "base_url": "https://api.anthropic.com",
      "api_key": "YOUR_ANTHROPIC_KEY",
      "provider": "anthropic",
      "max_tokens": 8192
    },
    {
      "model_display_name": "GPT5-Codex [Custom]",
      "model": "gpt-5-codex",
      "base_url": "https://api.openai.com/v1",
      "api_key": "YOUR_OPENAI_KEY",
      "provider": "openai",
      "max_tokens": 16384
    }
  ]
}

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Getting API Keys

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Anthropic

  1. Sign up at console.anthropic.com
  2. Navigate to API Keys section
  3. Create a new API key
  4. Copy and use in your configuration

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OpenAI

  1. Sign up at platform.openai.com
  2. Go to API Keys section
  3. Create a new secret key
  4. Copy and use in your configuration

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Notes

  • These configurations use the official APIs with full prompt caching support
  • Factory automatically handles prompt caching when available
  • Use /cost command in CLI to view cost breakdowns and cache hit rates
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