OpenAI Just Quietly Retired the Final GPT-4 Model From ChatGPT

My take: On June 26, OpenAI quietly removed GPT-4.5 from ChatGPT with little fanfare. No GPT-4 family model remains in the main interface: users with active conversations continue them in GPT-5.5, and API access persists for developers, but for everyday users the GPT-4 era is over. I stopped for a moment: in 2023, GPT-4 was the most impressive thing I had ever seen in my life. I compared it to having a superhuman assistant in my pocket. Three years later it is retired the same way Windows XP was, no party, no ceremony. That tells me more about the pace of this industry than any benchmark. If GPT-4 went from 'the future is here' to 'legacy model' in 36 months, what we are using today will look quaint by 2029. The only defense against that is to keep learning, no excuses. 🏁