ChatGPT Unlimited Free refers to the free tier of ChatGPT, which allows unlimited conversations without payment—but does come with some restrictions. You can access GPT‑4.1 mini and have unlimited chat history, as well as occasional use of more advanced models like GPT‑4o and o4‑mini, though these are limited in availability
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. You can use it on the web and mobile, and there’s no cap on the number of messages you can send
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. The trade‑off is slower responses, lower priority during peak times, and fewer advanced features compared to paid tiers like Plus or Pro.