OpenAI's GPT-5.1 Brings Smarter Reasoning and More Personality Presets To ChatGPT

OpenAI today released GPT-5.1, an update to its flagship model line. The update includes two versions: GPT-5.1 Instant, which OpenAI says adds adaptive reasoning capabilities and improved instruction following, and GPT-5.1 Thinking, which adjusts its processing time based on query complexity.
The Thinking model responds roughly twice as fast on simple tasks and twice as slow on complex problems compared to its predecessor. The company began rolling out both models to paid subscribers and plans t