Grok 2.5 and Grok‑1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1 shipped 637 days before Grok 2.5, so benchmark comparisons should account for the intervening progress.

Grok 2.5 is proprietary, while Grok‑1 is open weight.

Direct benchmark comparisons are unavailable — Grok 2.5 and Grok‑1 don't publish scores on any of the same benchmarks.