GPT-5 nano

GPT-5 nano launched alongside the GPT-5 family on August 7, 2025 as its ultra-fast, ultra-cheap tier. It targets high-volume classification, extraction, and summarization workloads where latency and cost matter more than frontier reasoning quality, priced at $0.05 per million input tokens and $0.40 per million output tokens.

Its standout trait is a 400K context window, unusual for a nano-tier model, which makes it attractive for long-document classification and summarization where 128K-tier rivals fall short. As of 2026 it remains live but is increasingly superseded by newer nano generations such as GPT-5.4 Nano for new workloads.