OpenAI has launched two new lightweight models, GPT-5.4 mini and GPT-5.4 nano, described as its most capable small models yet. The models are accessible to free and Go-tier ChatGPT users through a new “Thinking” option rather than a direct model selector. In testing, the Thinking models produced more detailed, multi‑step answers than the standard ChatGPT response, offering clearer reasoning for travel planning and online‑income strategies. While slightly less deep than the full‑size GPT-5.4 Thinking model available to Plus users, the mini and nano versions are faster and provide a notable upgrade for free users. Read more →

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 →