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GPT-5.3-Codex

OpenAI | In Edition 20,

The call on this one

DEPLOYif you pay for ChatGPT and use Codex

SOURCE OpenAI, Introducing GPT-5.3-Codex

GPT-5.3-Codex is available with paid ChatGPT plans everywhere Codex runs: the app, CLI, IDE extension, and web. It sets a new industry high on SWE-Bench Pro and Terminal-Bench, runs 25% faster, and matches GPT-5.2 on GDPval.

Added to The Deploy Log , updated . Read Edition 20, the edition that carried it.

56 rows from OpenAI in The Deploy Log are dated on or before this one, this one included.

The same day from OpenAI: OpenAI Frontier (0 days apart). After it: Lockdown Mode, 6 days later.

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One line every time AI actually ships, as it ships, 24/7. Follow the wire: Threads | Bluesky

One line every time AI actually ships, around the clock, free on Threads and Bluesky. Every one is in The Deploy Log with its source.

The Saturday edition is the week in one, free to read on the site, and by email if you want it: get it by email.