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OpenAI is making another change to its model lineup. GPT-5.5 is being phased out of several of its main products, which will affect both regular users and developers who’ve gotten used to working with it.
According to the company, GPT-5.5 will be retired from ChatGPT, ChatGPT Work, and Codex on October 14, 2026, across all plans. For most everyday ChatGPT users, the switch should feel pretty seamless: conversations will just move over to whatever model OpenAI sets as the new default. The bigger impact is for people who’ve built workflows around GPT-5.5, especially developers using it through Codex.
If you’re a Codex user signed in with a ChatGPT account, you’ll want to migrate before the cutoff. Official guidance points to switching to GPT-5.6 Sol (or GPT-6 Astra in some references). That means updating workspace defaults, saved model settings, managed configurations, custom agents, scheduled tasks, and any scripts that specifically call for GPT-5.5. The good news is this retirement doesn’t affect the OpenAI API itself. Anything authenticated with an API key should keep working as usual. This fits the pattern OpenAI has been following lately 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, so it’s had a relatively short run in the main product surfaces. Developers who hardcoded the model name into apps or automation tools will need to make the most updates to avoid any disruption once it’s no longer available in those interfaces.
OpenAI is framing the change as part of keeping things current. If you’re still relying on GPT-5.5 in the affected products, you’ve got until October 14 to make the switch. API users get to keep access for now, which should help some production setups stay uninterrupted while the consumer and ChatGPT-authenticated Codex experiences move on.
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(Source: [@ChatGPT on X](https://x.com/ChatGPT/status/2099954190600876533))