GPT-5 nano Blog

Jan 6, 2026
GPT-5 nano

GPT-5 nano API

GPT-5 Nano is the ultra-light, low-latency variant of OpenAI’s GPT-5 family, designed for cost-sensitive, real-time, and high-throughput applications where speed and price matter more than deep multi-step reasoning. It keeps the GPT-5 instruction-following and safety improvements but trades off reasoning depth and some long-context capabilities to deliver very low latency and very low token cost.