OpenAI releases GPT-5.3 Instant in ChatGPT: Here's how it's different

OpenAI says GPT-5.3 Instant improves conversational flow, trims excessive disclaimers and delivers more reliable answers ...

OpenAI releases GPT-5.4 Thinking and Pro in ChatGPT: How is it different

OpenAI has rolled out GPT-5.4 (Thinking) and GPT-5.4 Pro across ChatGPT, its API and Codex, introducing improvements in ...