Composer and Gemma 3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemma 3 shipped 231 days before Composer, so benchmark comparisons should account for the intervening progress.

Composer is proprietary, while Gemma 3 is open weight.

Direct benchmark comparisons are unavailable — Composer and Gemma 3 don't publish scores on any of the same benchmarks.