OpenAI’s latest update lets ChatGPT users choose how fast GPT-5 thinks: How the new feature works

OpenAI has introduced a new feature that gives ChatGPT users more control over how quickly GPT-5 with Thinking responds. The update, announced on X on September 18, allows Plus, Pro and Business subscribers to choose the “thinking time” of the model directly from the message composer on web.

OpenAI adds speed control to GPT-5 Thinking
Previously, GPT-5 with Thinking often took longer to generate responses, as the model was designed to reason more carefully before answering.