Claude 1 and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 1 shipped 1001 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.

Claude 1 is proprietary, while Devstral 2 (123B) is open weight.

Direct benchmark comparisons are unavailable — Claude 1 and Devstral 2 (123B) don't publish scores on any of the same benchmarks.