ChatGPT 5.1 consistently using 4o-mini?

I noticed ChatGPT started ignoring my prompts and giving instant responses. Whenver I ask it what model it is, it says 4o-mini, e.g. https://chatgpt.com/share/693670f8-e288-800d-ab2b-6c5a44f66195
Changing models between 5.1, 5, o3, etc doesn't change the behavior. Anyone else getting this bug?

Edit: this happens on other browsers and devices I think it's a ChatGPT issue

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