GPT-4.1 nano

GPT-4.1 Nano is the smallest and fastest model in the GPT-4.1 family, built for high-throughput and cost-constrained workloads. Despite its compact size, OpenAI keeps the 1 million token context window so it can still process extensive documents and datasets. It supports vision input, JSON schema structured output, and function calling, which makes it viable for classification, simple transformations, extraction, and lightweight reasoning at scale. It is the right choice when throughput and per-call cost are the main constraints but reliable structured output is still required.