GPT-5.1

OpenAI's flagship model with adaptive thinking that allocates computational effort based on question complexity. This model excels at sophisticated reasoning, deep real-world knowledge, advanced coding challenges, and complex multi-step workflows. It intelligently spends more time on hard problems while responding quickly to simpler ones. Perfect for professional work requiring OpenAI's best capabilities across reasoning, knowledge, and technical execution. Note: Currently deprecated due to thinking time variance; consider GPT-5.1 Thinking or GPT-5 Mini instead.