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Create a Routing API key:
With Codex 0.134.0 or later, create ~/.codex/dari.config.toml. The dari filename matches the profile name used below:
Codex sends Responses requests through your organization’s default router at /v1. model_reasoning_summary = "none" prevents Codex from requesting a summary that the router does not expose. The router chooses from its current managed model set. Omit model_reasoning_effort to let Dari choose the reasoning level, then check Activity in the dashboard to see each selection. To use a different model set, edit the default router or Create A Router with public or Custom Models. Set that router as the default to keep this same configuration, or point base_url at https://routing.dari.dev/{router_id}/v1.