INTRODUCING GPT-5.1 FOR DEVELOPERS

Summary from the TLDR newsletter

OpenAI has released GPT-5.1 on its API platform. The model can dynamically adapt how much time it spends thinking based on the complexity of tasks, making it significantly faster and more token-efficient on simpler everyday tasks. It features a 'no reasoning' mode to respond faster on tasks that don't require deep thinking. OpenAI has extended prompt caching for up to 24 hours to drive faster responses for follow-up questions at a lower cost. Priority Processing customers will experience notably faster performance with GPT-5.1 over GPT-5.