I recently upgraded a large portion of my pipeline from gpt-4.1-mini to gpt-5-mini. The performance was horrible - after some research I decided to move everything to mistral-medium-0525.
Same price, but dramatically better results, way more reliable, and 10x faster. The only downside is when it does fail, it seems to fail much harder. Where gpt-5-mini would disregard the formatting in the prompt 70% of the time, mistral-medium follows it 99% of the time, but the other 1% of the time inserts random characters (for whatever reason, normally backticks... which then causes it's own formatting issues).
Still, very happy with Mistral so far!
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