OpenAI's GPT-5.4 mini and nano launch - with near flagship performance at much lower cost ...
OpenAI's new small models are faster and cheaper than GPT-5.4—exactly what developers and businesses actually need.
OpenAI’s GPT‑5.4 mini is now available in the API, Codex, and ChatGPT, whereas GPT‑5.4 nano is only available in the API.