When Is ChatGPT 5.1 Retiring?

Описание: Are you still relying on GPT-5.1 for your daily drafting or logic tasks because 5.2 feels a bit too stiff? You might want to check your model dropdown menu immediately.

OpenAI is quietly retiring the GPT-5.1 Instant, Thinking, and Pro models on March 11, 2026. There was no big announcement. No email in your inbox. Just a small Legacy tag and a looming deadline. If your current workflows depend on the specific reasoning or speed of the 5.1 series, you have less than two weeks to pivot.

The Model Migration Blueprint
Audit Your Custom GPTs: Check your sidebar. If your custom bots are pinned to a 5.1 model, they will likely default to 5.2 (or break) after the cutoff.
Verify Your Legacy Menu: Open your model selector and look under the "Legacy models" tab to confirm your specific retirement dates.
The API Loophole: If a 5.1 model is non-negotiable for your business, transition that specific task to an API-based tool. These models typically live longer in the developer backend than they do in the chat interface.
Prepare for GPT-5.3: A sudden clearing of the middle-tier models often signals that a new version (potentially 5.3 or 5.4) is about to drop.


Pro Tips: OpenAI’s current flagship, GPT-5.2, has some documented friction points - mostly that it's very professional and formal compared to 4.0, which is kind of more laid back and casual. Also, keep in mind that GPT-5.2 does not have reasoning on by default. You’ll have to manually toggle the "Pro" or "Thinking" router if you’re doing heavy math or coding, or you'll just get the fast, less-logical output.


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Timestamps
0:00 - Which ChatGPT models are leaving on March 11, 2026?
1:23 - Do custom GPTs have different retirement dates?
2:26 - Is OpenAI releasing GPT-5.3 soon?

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