After a rocky GPT-5 launch, GPT-4o is officially back for paying ChatGPT subscribers. OpenAI CEO Sam Altman also promised users to give them a warning before taking away GPT-4o again.

GPT-5 was touted as a major upgrade to ChatGPT, but not everyone thinks that’s the case: “Kill 4o isn’t innovation, it’s erasure.”

OpenAI started rolling out GPT-5 to ChatGPT shortly after the AI system’s introduction last week. As part of the update, the company removed several of the chatbot service’s earlier LLMs. The move reportedly drew criticism from thousands of users, some of whom complained that GPT-5 provides lower output quality than its predecessor.