An Important Difference Between Anthropic and OpenAI Has Nothing to Do With Benchmarks

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Two agents can be similarly capable and still feel completely different to work with. I have spent a lot of time recently using both Anthropic and OpenAI models across writing, coding, research, and agent workflows. All of these frontier models are exceptionally good. This is not an argument that one is broadly superior to the other, or that this is the single most important difference between them. It is just a very interesting angle, and one that I think many people perceive when they use these models heavily but rarely put into words.