Gemma 2 and GPT-3.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-3.5 shipped 575 days before Gemma 2, so benchmark comparisons should account for the intervening progress.

Gemma 2 is open weight, while GPT-3.5 is proprietary.

Direct benchmark comparisons are unavailable — Gemma 2 and GPT-3.5 don't publish scores on any of the same benchmarks.