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

Note that the knowlege cutoff date for GPT-5.5 is December 1, 2025

developers.openai.com

GPT-5.5 Model | OpenAI API

This topic has been discussed before. Foundation models are not very good at describing themselves. It appears that it hasn’t been fixed yet