Could it be Mistral Large?
This beats GPT-4 on my personal test.
Refusals are a bit "I am just a language model"-y which GPT-4 has gotten away from. Also it's more refuse-y if I broach something rudely (which again I've found GPT-4 to have become much better at.)
Way better at everything than whichever Gemini I've been trying recently (can't tell for sure what I'm using when I use it.) But that one isn't even in contention for any use at all IME.
Overall it felt like I need to try it in daily use to work out if it's a contender with GPT-4 as a daily driver.
Back when GPT4 came out mid last year my bills were slightly more dramatic (i am what you would probably call a semi heavy individual user) but they never surpassed $200 USD for a single month.