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Codex is not compatible with Prem API today.
Codex custom providers use the OpenAI Responses API. Prem API does not expose /v1/responses, so changing base_url is not enough.

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Use a supported coding harness

  • Use OpenCode for an OpenAI-compatible coding agent.
  • Use Claude Code through Prem’s Anthropic-compatible launcher.
Codex support requires a verified Responses API adapter. See the Codex configuration reference for its current provider protocol.