Composer and Gemma 2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemma 2 shipped 489 days before Composer, so benchmark comparisons should account for the intervening progress.

Composer is proprietary, while Gemma 2 is open weight.

Direct benchmark comparisons are unavailable — Composer and Gemma 2 don't publish scores on any of the same benchmarks.