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OpenAI releases GPT-5.3-Codex, which it says helped build itself

See how this story connects

Source: OpenAI: Introducing GPT-5.3-Codex

OpenAI released GPT-5.3-Codex, extending its Codex coding agent to professional work across a computer, and said it was the first of its models that was instrumental in creating itself: the Codex team used early versions to debug its own training, manage its deployment and diagnose evaluation results.

Why it matters

OpenAI described its models doing part of the work of building the next model.

When
5 Feb 2026
ID
WTA-N-2026-0155
Who
OpenAI

Summary by wheresthe.ai, from OpenAI. Checked against the source on 9 Oct 2026.

Read the original at OpenAI

Source copy: download the page text as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: Led toOpenAI releases GPT-5.4 with native computer use and 1-million-token context

Cite this story

WTA-N-2026-0155: “OpenAI releases GPT-5.3-Codex, which it says helped build itself.” wheresthe.ai, 5 Feb 2026. https://wheresthe.ai/d/openai-gpt-5-3-codex-2026-02/ (source: OpenAI: Introducing GPT-5.3-Codex).

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