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Use the Anthropic-compatible base URL with a Tokenless API key:
Tokenless supports Anthropic’s Messages and Models routes, preserving the compatible request and response formats while routing behind profiles such as tokenless-pro.

Use an Anthropic client

Use Claude Code with tkl

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