Protocol Conversion Overview

Relay converters let developers keep their existing SDK format while calling models from another provider family.

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When to Use a Converter

Use a converter route when:

• your application already speaks OpenAI, Anthropic, or Gemini format
• you want to switch providers without rewriting request and response handling
• the native public route does not support the protocol family you need

If your request already matches the target provider protocol, use the native public route instead. See Routing & Protocols.

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Converter Matrix

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Current Limitations

• The Responses converter is stateless and partial: no previous_response_id, server-side storage, hosted tools, or structured output formats. See Responses Format.
• Gemini 3 models require thought signatures to be replayed on function calls. How well each format preserves them differs; check the Gemini 3 note on the format page you use. For multi-step tool use with Gemini 3, prefer the native Gemini route or the Responses format.

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Pick a Format