Tweet by OpenAIDevs

February 5, 2026

⚙️ Inside the Codex harness All Codex surfaces, including the Codex app, the Codex CLI, the Codex web app, and IDE integrations — like @Code, Xcode, and @JetBrains — are powered by the same Codex harness under the hood. We're sharing details on the Codex App Server, a JSON-RPC protocol that exposes this harness for integration. https://t.co/NdqI98cZpc

Author
OpenAIDevs
Date
February 5, 2026
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