One of the main edges Anthropic has is that "personality tuning" gap. "Nice to use" is a differentiator when raw performance isn't.

OpenAI can sometimes get an edge over Anthropic in hard narrow STEM tasks. I trust benchmarks over vibes there - and the benchmarks show the teams trading blows release after release. Tracking Claude Code vs OpenAI Codex on SWE-bench Verified feels like watching the back alley knife fight of the AI frontier.

But the vibe of "how easy is that model to interact with" and "how easy it is to get it to do what you want it to" does matter a lot when you are the one doing the interacting. And Opus makes for a damn good daily driver.