I often use chatgpt. They let you use the best version for free for a while, but then they cut you off for a few hours and downgrade you to the shitty version. But sometimes the answers that the free version gives you are so shitty that I suspect that the company deliberately makes it shitty. It's not because it's an old, less smart model. It's because they want it to give shitty answers to people buy the premium version.
kinda scummy if true.