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Use the OpenAI-compatible base URL with a Tokenless API key:
Tokenless preserves the OpenAI request and response formats for the routes below, while choosing the upstream model behind a routing mode such as tokenless-pro.

Use an OpenAI client

Use Codex with tkl

With the Tokenless CLI installed, sign in once and launch Codex through the OpenAI-compatible route. No API key setup is required.
For the full upstream specification, see the OpenAI API reference. Use these pages for the Tokenless-compatible routes and routing behavior.