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Good point. They said they validated the results by testing with other models (including Claude), as well as with manual sanity checks.

55% to 45% definitely isn't a blowout but it is meaningful — in terms of ELO it equates to about a 36 point difference. So not in a different league but definitely a clear edge

Maybe not as much to us, but for people building these tools, 4.1 being significantly cheaper than Clause 3.7 is a huge difference.

I first read it as 55% better, which sounds significantly higher than ~22% which they report here. Sounds misleading.