GPT-5 Nano

GPT-5 Nano is the smallest, fastest variant in OpenAI’s GPT-5 system, succeeding GPT-4.1 Nano. It is designed for developer tools and rapid, ultra-low-latency interactions, with less reasoning depth than larger counterparts while retaining instruction-following capabilities. This positioning makes it better suited to lightweight, high-throughput applications than to tasks requiring the deepest deliberation.

In practice, the model is a fit for cost-sensitive or real-time workflows that need quick, consistent outputs, including background processing, classification-style work, and developer-facing interactions. The supplied benchmark evidence describes measurable instruction-following and scientific-reasoning performance, but also shows substantial variation across difficult reasoning and coding evaluations, reinforcing its role as a compact efficiency model rather than a heavyweight problem solver.