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Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks

This story is from 2026-08-27. It is preserved in the archive; the latest stories are on the live feed.

Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks Short answer: an OpenAI-compatible label does not make one setup work for both tools. Claude Code uses the Anthropic Messages contract; Codex custom providers use the OpenAI Responses contract. Verify the tool-specific guide…

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  1. 2026-08-27 07:26 · DEV Community — AI
    Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks

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