I think this is a really interesting paper from Cohere, it really feels that at this point in time you can't trust any public benchmark, and you really need your own private evals.
I would pick one of two parts of that analysis that are most relevant to you and zoom in. I'd choose something difficult that the model fails at, then look carefully at how the model failures change as you test different model generations.
If I had to hazard a guess, as a poor soul doomed to maintain several closed and open source models acting agentically, I think you are hyper focused on chat trivia use cases (DeepSeek has a very, very, hard time tool calling and they say as much themselves in their API docs)