GPT-5.1 is OpenAI's next-generation flagship model, delivering noticeable gains in general helpfulness, nuanced empathy, and long-context reasoning over GPT-5. It handles complex instructions and multi-step workflows with high reliability while remaining strong at summarization, dense reading comprehension, and structured analysis across very large contexts. The model also improves creative writing and conversational flow, producing more consistent long-form content while staying aligned with user intent, and continues to support tool calling for sophisticated agentic applications.