OpenAI is retiring GPT-5.5 from ChatGPT, ChatGPT Work, and Codex on October 14, 2026, across all plans.
The change affects regular users and developers who have built workflows around the model.
For most everyday ChatGPT users, the transition should be seamless as conversations move to the new default model.
The bigger impact falls on developers using GPT-5.5 through Codex, especially those signed in with a ChatGPT account.
Codex Users Need to Migrate Before the Cutoff
Official guidance points Codex users to switch to GPT-5.6 Sol or GPT-6 Astra before October 14.
That means updating workspace defaults, saved model settings, managed configurations, custom agents, scheduled tasks, and any scripts that specifically call for GPT-5.5.
Developers who hardcoded the model name into apps or automation tools will need to make the most updates to avoid disruption.
The retirement does not affect the OpenAI API itself, so anything authenticated with an API key should keep working as usual.
This fits OpenAI's recent pattern of retiring older models once newer ones are ready.
GPT-5.4 class models were already pulled from Codex at the end of August 2026.
GPT-5.5 itself only launched on April 23, 2026, giving it a relatively short run in the main product surfaces.
OpenAI is framing the change as part of keeping things current.
If you still rely on GPT-5.5 in the affected products, you have until October 14 to make the switch.
API users keep access for now, which should help some production setups stay uninterrupted while consumer and ChatGPT-authenticated Codex experiences move on.
