OpenAI added three model deprecations to its API Deprecations page on October 1, 2026. GPT-5.3-Codex and GPT-5.1 should migrate to gpt-6-sol, while GPT-5.4-Nano should migrate to gpt-6-luna. All three are scheduled to be removed from the API on April 1, 2027. Applications, automations, and agent workflows that hard-code these model IDs should migrate and regression-test before the deadline. This notice confirms an API lifecycle change only; the page does not separately announce matching removals from model selection in ChatGPT or Codex clients.
API 弃用与迁移
OpenAI Will Retire GPT-5.3-Codex, GPT-5.1, and GPT-5.4-Nano From the API on April 1, 2027
OpenAI has deprecated GPT-5.3-Codex, GPT-5.1, and GPT-5.4-Nano in the API with roughly six months of migration notice. Developers using these model IDs need to move to the recommended replacements before April 1, 2027.
Original timing and sources
Event timing
October 1, 2026. Precision: date only. Time zone: not published. Evidence: OpenAI API Deprecations labels the announcement “2026-10-01.”
Source post / update timing
OpenAI API Deprecations: October 1, 2026. Precision: date only. Exact posting time and time zone were not published.
Scheduled API shutdown date
April 1, 2027. Precision: date only. Time zone: not published.
Source checked at
October 4, 2026 06:46 (UTC+08:00) / October 3, 2026 22:46 UTC. Precision: minute.