Core Insights - OpenAI released GPT-5, which was expected to be a significant technological upgrade, but unexpectedly removed all previous versions including GPT-4, GPT-4.5, and GPT-3, forcing all users to switch to GPT-5 [1] Summary by Categories - **Product Launch** - OpenAI launched GPT-5, marking a new phase in AI development [1] - **User Impact** - All users were compelled to transition to GPT-5, with no option to continue using earlier versions [1]