ANNOUNCED
OpenAI schedules GPT-5 API models for shutdown on April 1, 2027
2026-10-01
OpenAI issued API deprecation notices on October 1 giving developers six months to move off GPT-5.3-Codex, GPT-5.1, and GPT-5.4-Nano — all three models are scheduled for removal from the API on April 1, 2027.
The notices name replacements: GPT-6 Sol is recommended for both GPT-5.3-Codex and GPT-5.1, while GPT-6 Luna is the named successor for GPT-5.4-Nano. Separately, four speech-model IDs — tts-1, tts-1-hd, and two dated gpt-4o-mini-tts variants — shut down on January 6, 2027, with gpt-realtime-2.1-mini as the replacement.
The notices turn OpenAI's general retirement policy into a concrete migration task: teams should inventory live dependencies, test the replacement models in their applications, and complete the move before the shutdown dates. The scope is the OpenAI API itself; ChatGPT subscriptions, Codex, Azure deployments, and gateway-managed aliases may follow separate schedules.