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GPT‑5-Codex and upgrades to Codex
OpenAI half-released a new model today: GPT‑5-Codex, a fine-tuned GPT-5 variant explicitly designed for their various AI-assisted programming tools. I say half-released because it's not yet available via their API, …
Large, complex tasks should use run for much longer - OpenAI report Codex crunching for seven hours in some cases! "GPT‑5-Codex also shows significant improvements in human preference evaluations when creating mobile websites" - in the past I've habitually prompted models to "make it mobile-friendly", maybe I don't need to do that any more. He was generally impressed but noted that it was surprisingly bad at using the Codex CLI search tool to navigate code.
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