Compare / head-to-head
Gemini 3.1 Pro PreviewvsGrok 4.20 Reasoning
Gemini 3.1 Pro Preview leads 5 of 5 shared benchmarks. Grok 4.20 Reasoning is 3.7x cheaper per token. Gemini 3.1 Pro Preview has the larger context window (1.0M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
Gemini 3.1 Pro Preview leads
Cheaper per token
Grok 4.20 Reasoning
3.7x cheaper, input + output
Larger context
Gemini 3.1 Pro Preview
1.0M tokens
Provider uptime (30d)
100% · —
Google · xAI
Gemini 3.1 Pro Preview
Google · released 2026-02-19
textvisionaudio
Grok 4.20 Reasoning
xAI · released 2026-03-09
textvision
Quality
Benchmark matrix
5 shared · 4 only Gemini 3.1 Pro Preview · 0 only Grok 4.20 Reasoning| Benchmark | Gemini 3.1 Pro Preview | Grok 4.20 Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 94.3% ↗ | 89.3% ↗epoch | +5 pt | Gemini 3.1 Pro Preview |
| FrontierMath Tier 4 v2 (Epoch AI run) | 26.8% ↗epoch | 17.1% ↗epoch | +9.7 pt | Gemini 3.1 Pro Preview |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 59.6% ↗epoch | 44.9% ↗epoch | +14.7 pt | Gemini 3.1 Pro Preview |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 95.6% ↗epoch | 92.2% ↗epoch | +3.4 pt | Gemini 3.1 Pro Preview |
| SimpleQA Verified | 73.5% ↗epoch | 30.2% ↗epoch | +43.3 pt | Gemini 3.1 Pro Preview |
| Only Gemini 3.1 Pro Preview reports · 4 | ||||
| AIME 2026 | 98.3% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1480.1 ↗ | not reported | — | — |
| ARC-AGI-2 | 77.1% ↗ | not reported | — | — |
| SWE-Bench Pro | 54.2% ↗ | not reported | — | — |
| Only Grok 4.20 Reasoning reports · 0 | ||||
| Grok 4.20 Reasoning reports nothing Gemini 3.1 Pro Preview does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Gemini 3.1 Pro Preview minus Grok 4.20 Reasoning in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Gemini 3.1 Pro Preview | Grok 4.20 Reasoning | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 1M tokens | Gemini 3.1 Pro Preview |
| Max output | 66K tokens | — | — |
| Input price / 1M | $2 ↗ | $1.25 ↗ | Grok 4.20 Reasoning |
| Output price / 1M | $12 ↗ | $2.5 ↗ | Grok 4.20 Reasoning |
| Cached input / 1M | $0.2 ↗ | $0.2 ↗ | Tie |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $14 | $3.75 | Grok 4.20 Reasoning |
| Modalities | text · vision · audio | text · vision | Gemini 3.1 Pro Preview |
| Released | 2026-02-19 | 2026-03-09 | — |
| Cited benchmark scores | 10 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 3.1 Pro Preview vs …
Models sharing the most benchmarksMore matchups
Grok 4.20 Reasoning vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Gemini 3.1 Pro Preview and Grok 4.20 Reasoning on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.