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OpenAI GPT-5.5 to Be Retired on October 14: Affects ChatGPT and Codex, Official Recommends Migrating to New Model
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OpenAI GPT-5.5 will be taken offline on October 14
On September 16, according to IT Home, OpenAI announced that GPT-5.5 will be taken offline from ChatGPT, ChatGPT Work, and Codex on October 14. This retirement covers all subscription plans, and the scope includes all plans. OpenAI also reminded users who use GPT-5.5 in Codex to switch to GPT-5.6 Sol or GPT-6 Astra as soon as possible. The news was published by IT Home author Wen Zhou.
GPT-5.5 was not just released. IT Home previously reported that OpenAI announced the launch of the GPT-5.5 model on April 24 of this year. Compared with GPT-5.4, GPT-5.5 reduces token consumption when completing the same tasks. Related reports also said that the model's token cost dropped to 1/35, output per megawatt increased 50-fold, and it was described as OpenAI's most intelligent AI model.
Judging from the retirement arrangement, ChatGPT, ChatGPT Work, and Codex are all included. OpenAI stated that this discontinuation scope includes all plans, meaning users on different subscription plans will all be affected. For Codex users who still rely on GPT-5.5, the official optional replacement models are GPT-5.6 Sol and GPT-6 Astra. The official recommendation is that relevant users complete the migration as soon as possible.
Related reading information shows that GPT-5.5 attracted attention when it was released. Altman once talked about GPT-5.5 autonomously planning a launch event and hoped that human developers would toast it, but the model itself refused to give a toast. IT Home related reading also mentioned that when GPT-5.5 debuted, token cost dropped to 1/35, and output per megawatt increased 50-fold. This information forms the background of the retirement news.
For Codex users, the replacement path is relatively clear. The two models given by OpenAI are GPT-5.6 Sol and GPT-6 Astra. If users continue to use GPT-5.5 in Codex, they will face service changes after October 14. The official reminder to switch as soon as possible means that the transition time left for users of the old model is limited.
For ChatGPT and ChatGPT Work users, the retirement likewise covers all subscription plans. This adjustment once again shows that OpenAI is pushing users to migrate to newer models. The pace of model iteration is accelerating, and users need to pay attention to official notices. This discontinuation scope includes all plans, and the replacement model information is mainly provided for Codex users.
As October 14 approaches, the lifecycle of GPT-5.5 in ChatGPT, ChatGPT Work, and Codex will end. OpenAI recommends that Codex users migrate to GPT-5.6 Sol or GPT-6 Astra. This retirement covers all subscription plans, and the impact is broad. Whether users can smoothly migrate afterward, as well as the actual performance of the replacement models, will become the focus of attention.
