OpenAI API: GPT-5.3 Codex, GPT-5.1 and GPT-5.4 nano removal, 1 Apr 2027
1 Apr 2027
1 Apr 2027
Who it covers
Anyone calling the OpenAI API with gpt-5.3-codex, gpt-5.1 or gpt-5.4-nano.
What the sources say
OpenAI's deprecations page says these models are deprecated and will be removed from the API on 1 Apr 2027, with six months notice: gpt-5.3-codex (recommended replacement gpt-6-sol), gpt-5.1 (gpt-6-sol) and gpt-5.4-nano (gpt-6-luna). The entry is dated 1 Oct 2026.
What we could not confirm. This is the only 1 Apr 2027 batch we saw on the page on the date we read it. More may be added. Re read the official page before you migrate.
Sources
Read by us on 19 Oct 2026.