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What should Codex base_url be?
For Responses API style configuration, Codex should usually use https://api.zzswitch.com/v1.
What /v1 does
/v1 is the common versioned base path for OpenAI-compatible APIs. The client appends request paths after it.
Do not apply it everywhere
Claude/CC-style tools may require the root endpoint https://api.zzswitch.com.