Gateway

How to set a custom base URL

The gateway origin is the same for every client. Claude Code uses ANTHROPIC_BASE_URL. Codex, GPT, and OpenAI SDKs use base_url on /v1. Cursor overrides the OpenAI base URL.

Last updated 7 September 2026.

POST https://api.zerouter.ai/v1/messages          # Claude / Kimi
POST https://api.zerouter.ai/v1/responses         # GPT / Grok / Codex
POST https://api.zerouter.ai/v1/chat/completions  # Gemini / OpenAI Chat