Gemma 3 and Grok‑1.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1.5 shipped 348 days before Gemma 3, so benchmark comparisons should account for the intervening progress.

Gemma 3 is open weight, while Grok‑1.5 is proprietary.

Direct benchmark comparisons are unavailable — Gemma 3 and Grok‑1.5 don't publish scores on any of the same benchmarks.