This model is 17 months old. A newer version of it has since shipped: GPT-6 Astra (2026-09-03). The details below are still accurate for this model — it just is not what we would recommend today.
GPT-4.1 nano
OpenAI🇺🇸 United States
Smallest and cheapest GPT-4.1. Optimized for classification and low-latency tasks.
Context window1000K tokens
Input / 1M tokens$0.1
Output / 1M tokens$0.4
Version History
gpt-4.1-nano-2025-04-14major
GPT-4.1 nano is OpenAI's smallest and fastest model. Ideal for classification, routing, and real-time applications.