PCWorld reports that OpenAI launched GPT-5.4 mini and GPT-5.4 nano AI models, bringing advanced capabilities to Free and Go tier ChatGPT users. GPT-5.4 mini offers over twice the speed of GPT-5.0 mini with improved reasoning,

OpenAI's new GPT-5.4 mini model offers performance improvements in reasoning, multimodal understanding and more.

OpenAI just launched GPT 5.4 mini and nano models which are now live in the API, Codex, and ChatGPT with improved coding capabilities.