OpenAI to retire GPT-5.5 from ChatGPT and Codex on October 14

OpenAI has announced that GPT-5.5 will be taken offline from ChatGPT, ChatGPT Work, and Codex on October 14, affecting all subscription plans. Codex users still relying on the model are advised to switch to GPT-5.6 Sol or GPT-6 Astra as soon as possible.

GPT-5.5 was launched on April 24 this year. Compared with GPT-5.4, it uses fewer tokens to complete the same tasks. OpenAI previously said the model cut token costs to 1/35 of the previous generation and boosted output per megawatt by 50 times.

The shutdown covers all subscription plans, and users need to migrate before the deadline.