Gateway
Edit ~/.codex/config.toml
Codex CLI and GPT-compatible clients read a custom provider from config.toml. Set base_url to the gateway /v1 path and keep the key in ZEROUTER_API_KEY.
Last updated 7 September 2026.
Codex CLI and GPT ยท config.toml
Edit ~/.codex/config.toml
Add a provider named zerouter. base_url must include /v1. Set ZEROUTER_API_KEY in the environment, then start Codex.
~/.codex/config.toml
model = "gpt-5.4"
model_provider = "zerouter"
[model_providers.zerouter]
name = "zerouter"
base_url = "https://api.zerouter.ai/v1"
env_key = "ZEROUTER_API_KEY"
wire_api = "responses"Then export the key
export ZEROUTER_API_KEY="sk-xxxx"
codex