Composer and Gemma 4 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Composer shipped 155 days before Gemma 4, so benchmark comparisons should account for the intervening progress.

Composer is proprietary, while Gemma 4 is open weight.

Direct benchmark comparisons are unavailable — Composer and Gemma 4 don't publish scores on any of the same benchmarks.