Modelpeers

GPT-5.3-Codex, GPT-5.1 and GPT-5.4 nano

3 models from OpenAI

Retiring

Takes effect Apr 1, 2027 · in 151 days

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.

Who is affected:
Apps calling these models.
Action needed:
Migrate before April 1, 2027.

Source

"The following models are deprecated and will be removed from the API on April 1, 2027"

OpenAI API deprecations page

Published

Open the sourcedevelopers.openai.com

Modelpeers tracks changes to AI agents and models, each from its source. Follow GPT-5.3-Codex to get a weekly email when it changes.