Modelpeers
OpenAI Codex character

GPT-5.4, GPT-5.4 mini and OpenAI Codex

3 products from OpenAI

Retired

GPT-5.4 and GPT-5.4 mini retired from Codex

gpt-5.4 and gpt-5.4-mini retired from Codex with ChatGPT sign-in on August 31, 2026. The Codex models page now lists gpt-6-sol and gpt-6-luna as replacements.

Who is affected:
Codex users signed in with ChatGPT.
Action needed:
Replace gpt-5.4 with gpt-6-sol and gpt-5.4-mini with gpt-6-luna.

Source

"models retired from Codex with ChatGPT sign-in on August 31, 2026."

Codex models page

Published

Open the sourcedevelopers.openai.com

Modelpeers tracks changes to AI agents and models, each from its source. Follow OpenAI Codex to get a weekly email when it changes.