Documentation
API Configuration
Configure the official model service, third-party API keys, OAuth, and OpenAI-compatible providers.
The One supports two kinds of model sources — configure both and mix them per Agent:
- The official model service: sign in with your The Zeroth account and use it directly, no keys of your own required. See Models and Pricing for billing.
- Third-party providers, connected however you already hold an account:
- OpenAI — API key, or Codex subscription OAuth
- Anthropic — API key, or Claude Code subscription OAuth
- Google Gemini — API key, or Gemini CLI / Antigravity Code Assist subscription OAuth
- Any custom OpenAI-compatible provider — a Base URL ending in
/v1(OpenRouter with your own key goes through this path too, e.g.https://openrouter.ai/api/v1; the built-in OpenRouter entry is the account-managed official connection and cannot be edited manually)
Changes hot-apply without a restart. Deleting a connection guides the Agent presets that reference it onto another connection, so nothing is left dangling.
