Gemini 1.5 Flash and LLaMA 2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. LLaMA 2 shipped 301 days before Gemini 1.5 Flash, so benchmark comparisons should account for the intervening progress.

Gemini 1.5 Flash is proprietary, while LLaMA 2 is open weight.

Direct benchmark comparisons are unavailable — Gemini 1.5 Flash and LLaMA 2 don't publish scores on any of the same benchmarks.