GPT-5.3-Codex, GPT-5.1 and GPT-5.4-Nano leave the OpenAI API on April 1, 2027

ChatGPTRetirementAnnounced

OpenAI deprecated gpt-5.3-codex, gpt-5.4-nano and gpt-5.1.

They will be removed from the API on April 1, 2027, with six months' notice.
OpenAI recommends migrating gpt-5.3-codex and gpt-5.1 to gpt-6-sol, and gpt-5.4-nano to gpt-6-luna, before the shutdown date.

Who can use it: OpenAI API developers using gpt-5.3-codex, gpt-5.1 or gpt-5.4-nano.
When: 2027-04-01 · date only
Deprecation announced October 1, 2026. Removal April 1, 2027, given as a calendar date with no time.

OpenAI API deprecations Announced 2026-10-01 · date only

Read the official announcement for access details. Availability can depend on your plan, region or workplace settings.

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