Did you know that the free version of ChatGPT uses something called the ChatGPT-3.5 engine but that an updated, more powerful version is available on paid-for accounts? This is ChatGPT 4 - it shows better reasoning powers and is more trustworthy (less likely to just make stuff up but not 100% so).
See https://www.theguardian.com/technology/2023/mar/15/what-is-gpt-4-and-how-does-it-differ-from-chatgpt
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