According to OpenAI's release notes, from 12/06/2026, GPT-5.2 (Instant/Thinking/Pro) is no longer available in ChatGPT and old conversations move automatically to the corresponding GPT-5.5; GPT-4.5 retires on 27/06 and o3 is expected to retire on 26/08. OpenAI has also added the "Active sessions" security feature so users can review their login sessions.
Quick summary
- When: from 12/06/2026.
- What: GPT-5.2 is dropped from ChatGPT, conversations move to GPT-5.5; GPT-4.5 (27/06) and o3 (26/08) retire.
- New: the 'Active sessions' feature to review login sessions (device, time, etc.).
- Lesson: model lifecycles are very short — building processes on a specific model is easy to trip over.
What happened?
According to OpenAI's release notes page, the schedule of retirements and model swaps is coming thick and fast: GPT-5.2 gives way to GPT-5.5, with older models retiring one by one on specific dates. In parallel, 'Active sessions' helps users better control account security (viewing devices, approximate location, login time).
Why this matters
Cloud AI model lifecycles are very short. Businesses that build processes or products tightly around a specific model can be affected when the provider swaps or retires that model — they have to re-test, adjust prompts, and sometimes deal with changed output behavior.
A perspective for businesses
One more reason for in-house AI: when you run open-source models on your own infrastructure, your business controls when to upgrade — you're not forced to swap models on the provider's schedule, keeping your operational processes stable.
Frequently asked questions
Can GPT-5.2 still be used in ChatGPT?
According to OpenAI's release notes, from 12/06/2026 GPT-5.2 is no longer available in ChatGPT and old conversations move automatically to the corresponding GPT-5.5.
What is 'Active sessions'?
It is a security feature that lets users review their account login sessions (device, time, approximate location, trusted devices).
Why is a short model lifecycle a risk for businesses?
Because processes or products tied to a specific model may need to be re-tested and adjusted when the model is swapped or retired. In-house AI helps you control when to upgrade.
Keep your AI stable and under control
Namtech deploys in-house AI on open-source models — you decide when to upgrade, never caught off guard.
Book a free consultationNote: This article is compiled from public sources as of 23/06/2026; information is for reference and may change.