ChatGPT Pro users have been clocking something unusual this week: responses that run longer and cut sharper than anything GPT-5.5 ever produced, while generation times stretch to an hour or more on ...

OpenAI has officially introduced the GPT 5.3 Instant, an upgrade of the model that powers most day-to-day ChatGPT conversations. With this new model, the company aims to offer better usability, tone ...