text model comparison
Gemini 3.1 Pro Preview vs Grok 4.20
Gemini 3.1 Pro Preview and Grok 4.20 are both current text models, from Google and xAI. On Arena Text, Gemini 3.1 Pro Preview scores 1487 Elo and Grok 4.20 1472 Elo (Arena, measured October 8, 2026). Both accept about 1.05M tokens of context (1,048,576 and 1,000,000).
Data verified October 12, 2026 · Dataset 2026-10-12
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | Gemini 3.1 Pro Preview | Grok 4.20 |
|---|---|---|
| Price per 1M input tokens | Not reported | $1.25 |
| Price per 1M output tokens | Not reported | $2.50 |
| Arena Text | 1487 Elo (#8 of 39) (better) | 1472 Elo (#22 of 39) |
| GPQA Diamond | 94.4% (#6 of 37) (better) | 89.3% (#28 of 37) |
| FrontierMath Tiers 1-3 (v2) | 59.6% (#26 of 37) (better) | 44.9% (#31 of 37) |
| SimpleQA Verified | 73.5% (#3 of 34) (better) | 30.2% (#30 of 34) |
| Provider | xAI | |
| Release date | February 19, 2026 | March 10, 2026 |
| Access | API only | API only |
| Context window | 1,048,576 tokens | 1,000,000 tokens |
| Max output | 65,536 tokens | Not reported |
| Input | text, image, audio, video | text, image |
| Output | text | text |
When to choose each
Gemini 3.1 Pro Preview
Best for
- Multimodal reasoning and agentic coding evaluations
Watch out for
- This preview endpoint may change before becoming stable; production use should account for its published prompt-length price tiers
Grok 4.20
Best for
- Comparing single-agent and multi-agent reasoning on long-context workloads
Watch out for
- The published base rates double when requests reach the provider's 200,000-token long-context threshold
Gemini 3.1 Pro Preview vs Grok 4.20 FAQ
Which scores higher on independent benchmarks, Gemini 3.1 Pro Preview or Grok 4.20?
Gemini 3.1 Pro Preview leads on Arena Text, 1487 Elo to 1472 Elo; Gemini 3.1 Pro Preview leads on GPQA Diamond, 94.4% to 89.3%; Gemini 3.1 Pro Preview leads on FrontierMath Tiers 1-3 (v2), 59.6% to 44.9%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, Gemini 3.1 Pro Preview or Grok 4.20?
Both accept about 1.05M tokens of context (1,048,576 and 1,000,000).
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Production evaluation
Choosing between Gemini 3.1 Pro Preview and Grok 4.20?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty