OpenAI has expanded its GPT-5.4 family with two new variants—GPT-5.4 mini and GPT-5.4 nano. The mini model is now accessible to Free and Go ChatGPT users via the "Thinking" menu and serves as a fallback for paid users who hit rate limits. It delivers reasoning, multimodal understanding, and tool‑use capabilities that approach the full GPT-5.4 while running more than twice as fast. The nano model is targeted at data‑classification and extraction tasks, offered exclusively through the API at a cost‑effective price of $0.20 per million input tokens. Read more →