Technology & Science

OpenAI Rolls Out GPT-5.4 Mini & Nano, Extending Near-Flagship AI to Free and Low-Cost Tiers

Between 18–19 March 2026, OpenAI released two downsized variants of its GPT-5.4 model—Mini (now selectable by Free and Go ChatGPT users) and Nano (API-only)—delivering almost flagship-level accuracy at more than double the speed of GPT-5 Mini while slashing per-token costs.