# Gemini 3.1 Pro vs Grok 4.3

> Side-by-side benchmark comparison for Gemini 3.1 Pro and Grok 4.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-pro-vs-grok-4-3
- Last updated: September 10, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Gemini 3.1 Pro if you want the stronger benchmark profile. Grok 4.3 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Gemini 3.1 Pro leads overall 69.95 to 59.73.
- The clearest category separation is in reasoning, where the averages are 50.6 for Gemini 3.1 Pro and 65.2 for Grok 4.3.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 70.8% and 41.9%.
- Grok 4.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 3.1 Pro | Grok 4.3 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.95 | 59.73 |
| Benchmarks Covered | 28 | 7 |
| Pricing (input/output) | $2.00 / $12.00 | $1.25 / $2.50 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.1 Pro
- Gemini 3.1 Pro public-lane score: 38.9 (Supported · #121/152)
- Grok 4.3 public-lane score: 26.9 (Supported · #144/152)

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 57.8% | Coming soon | Coming soon |
| DeepSearchQA | 69.7% | Coming soon | Coming soon |
| τ²-bench results | 95.6% | Coming soon | Coming soon |
| Gert Labs | 56.87% | 43.86% | Gemini 3.1 Pro |
| ResearchClawBench | 13.3% | 12.4% | Gemini 3.1 Pro |
| Terminal-Bench 2.1 (Vals) | 70.8% | 41.9% | Gemini 3.1 Pro |

### Coding

- Winner: Gemini 3.1 Pro
- Gemini 3.1 Pro public-lane score: 46.3 (Supported · #82/151)
- Grok 4.3 public-lane score: 33.6 (Supported · #131/151)

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 82.9% | Coming soon | Coming soon |
| React Native Evals | 78.9% | Coming soon | Coming soon |
| Vibe Code Bench | 32.03% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 88.5% | 84.5% | Gemini 3.1 Pro |
| SWE-bench (Vals) | 78.8% | 71.4% | Gemini 3.1 Pro |

### Multimodal & Grounded

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 79.2 (#12/48)
- Grok 4.3 public-lane score: 65.6 (#25/48)

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 83.9% | Coming soon | Coming soon |
| CharXiv | 80.2% | Coming soon | Coming soon |
| ERQA | 69.4% | Coming soon | Coming soon |
| SimpleVQA | 72.4% | Coming soon | Coming soon |
| ScreenSpot Pro | 84.4% | Coming soon | Coming soon |
| ZeroBench | 29.0% | Coming soon | Coming soon |
| MedXpertQA (MM) | 81.3% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 50.6 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: 65.2 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 77.1% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |

### Knowledge

- Winner: Gemini 3.1 Pro
- Gemini 3.1 Pro public-lane score: 66.1 (Supported · #21/183)
- Grok 4.3 public-lane score: 57 (Supported · #44/183)

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 94.3% | Coming soon | Coming soon |
| HLE w/o tools | 45.4% | Coming soon | Coming soon |
| HealthBench Hard | 20.6% | Coming soon | Coming soon |
| MedXpertQA (Text) | 71.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 95.5% | 91.4% | Gemini 3.1 Pro |
| MMLU-Pro (Vals) | 91.0% | 85.8% | Gemini 3.1 Pro |

### Instruction Following

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: Coming soon
- Grok 4.3 public-lane score: 94.4 (#2/123)

### Mathematics

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 54.3 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: Coming soon

| Benchmark | Gemini 3.1 Pro | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 36.900% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 16.700% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Gemini 3.1 Pro or Grok 4.3?

Gemini 3.1 Pro is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.1 Pro and Grok 4.3?

The widest category gap is in reasoning, where the averages are 50.6 for Gemini 3.1 Pro and 65.2 for Grok 4.3.

### How many benchmarks does Gemini 3.1 Pro cover on BenchLM?

Gemini 3.1 Pro currently has 28 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.3 cover on BenchLM?

Grok 4.3 currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.1 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-3-1-pro)
- [Grok 4.3 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-4-3)
- [Gemini 3.1 Pro vs GPT-6 Astra](/compare/gemini-3-1-pro-vs-gpt-6-astra)
- [Grok 4.3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-3)

## Explore More

- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [Grok 4.3 profile](/models/grok-4-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)