GPT-5.3-Codex changelog

GPT-5.3-Codex, GPT-5.1 and GPT-5.4 nano to shut down April 1, 2027

gpt-5.3-codex and gpt-5.1 will be removed on April 1, 2027 with gpt-6-sol as the replacement. gpt-5.4-nano moves to gpt-6-luna.

Takes effect Apr 1, 2027 · in 151 days

Who is affected:

Apps calling these models.

Action needed:

Migrate before April 1, 2027.

GPT-5.3-Codex and GPT-5.2 deprecated in Codex

GPT-5.3-Codex and GPT-5.2 are no longer user-selectable in Codex for ChatGPT sign-in. API-key workflows are not affected.

Who is affected:

Codex users signed in with ChatGPT who used these models.

Action needed:

Switch to GPT-5.5, GPT-5.4 or GPT-5.4 mini.