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Summer Of Codex

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John Siwicki
Sep 19, 2025
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Introducing GPT‑5 Codex: Agentic Coding, Outside ChatGPT

GPT‑5 Codex is a GPT‑5 variant optimized for agentic coding workflows. It is positioned as a code-first assistant and (at least for now) isn’t available as part of ChatGPT Codex.

  • What it is: A GPT‑5 build tuned for autonomous code reading, planning, and multi‑file edits

  • Why it matters: Faster refacto…

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