Stealth Model Swap? GPT-5.5 High Claims Knowledge Cutoff is June 2024

Hey folks, we’ve reached out to our internal team to get some clarification on the gap here.

Right now, the confusing part seems to be that GPT-5.5 may still report a June 2024 knowledge cutoff in chat responses, even though the published documentation lists Dec 1, 2025.

We’ll update this thread once we hear back with more concrete details on whether this is:

• a stale self-reported cutoff response
• model routing behavior
• or a docs/UI inconsistency

Appreciate everyone sharing sample chats and details so far. That context is helpful for narrowing down what’s happening here.

-Mark G.