Inside OpenAI's Codex comeback: from failed launch to swallowing ChatGPT
every · x · 2026-10-16
Every publishes Dan Shipper's long-form "How Codex Happened," chronicling OpenAI's comeback in AI coding. Shipper recalls the night before GPT-5's launch at OpenAI's Mission Bay office in summer 2025: his team had a month of early access and ten people tested the model intensively, finding its coding performance in Codex underwhelming at the time.
- The piece traces Codex's pivot from an early cloud version with no product-market fit to the local, terminal-based form developers actually adopted.
- Today Codex is the centerpiece of OpenAI's comeback, having swallowed ChatGPT from within and become the foundation for everything the company builds next.
- Meta detail: Shipper used Gemini's Argon 4 to work out section reorganization edits, then had Codex apply them as suggested changes in Google Docs, preserving existing comments.
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