Epoch AI researcher Michelle Campeau explains how a model can look 40% better overnight simply because the benchmark changed, not the model: "Being able to see this is the highest score on this specific benchmark is the best information you have about how something is going to do." "Critical Point, one of the physics benchmarks, Anthropic mentioned in their latest system card that it has over 40% of questions that are broken, so they ran their own corrected version. And this corrected version…