OpenAI GPT-5.1

GPT-5.1 is designed to address the limitations of universal AI experiences by introducing a more dynamic and personalized architecture. The model features two distinct processing modes: an Instant mode optimized for low-latency, transactional tasks, and a Thinking mode that allocates deeper computational resources for complex data interpretation and content planning. This adaptive reasoning capability allows the model to dynamically adjust its logic based on the complexity of a prompt, ensuring that simple queries are handled efficiently while advanced tasks receive the necessary analytical depth.

The model lineage includes specialized training on agentic tasks, particularly within software engineering, mathematics, and research. A notable advancement in this release is the use of a compaction process, which enables the model to maintain coherence across millions of tokens, supporting long-running agent loops and large-scale debugging sessions. By incorporating training for specific environments like Windows and improving collaboration within command-line interfaces, the model is built to function as a reliable partner for detailed, multi-hour technical workflows.