How to Use OpenAI Codex CLI with OpenRouter

Using OpenAI Codex CLI with OpenRouter allows users to integrate over 300 models through a single API key, offering benefits like automatic provider failover and consolidated usage tracking without altering Codex itself. The setup involves configuring the ~/.codex/config.toml file to include details such as model, model_provider, and wire_api set to "responses" to align with OpenRouter's requirements. Users must ensure the model slug matches exactly with an OpenRouter listing and that configuration settings are placed correctly in the user-level config file to avoid common errors like model_not_found. OpenRouter facilitates easy switching between models, supports both OpenAI and open-source models, and provides team cost controls and real-time usage visibility. It charges a 5.5% fee on credit purchases with no markup on provider pricing, and failed requests are not billed.

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