# Gemini 3.1 Pro vs Gemma 4 31B

> Side-by-side benchmark comparison for Gemini 3.1 Pro and Gemma 4 31B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-pro-vs-gemma-4-31b
- Last updated: September 30, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Gemini 3.1 Pro if you want the stronger benchmark profile. Gemma 4 31B 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 64.51 to 40.39.
- The clearest category separation is in knowledge, where the averages are 66.6 for Gemini 3.1 Pro and 39.1 for Gemma 4 31B.
- The biggest single benchmark swing is HLE w/o tools in Knowledge, with scores of 45.4% and 19.5%.
- Gemma 4 31B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Gemini 3.1 Pro also has the larger context window at 1M.

## Model Snapshot

| Property | Gemini 3.1 Pro | Gemma 4 31B |
|----------|----------|----------|
| Creator | Google | Google |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 64.51 | 40.39 |
| Benchmarks Covered | 29 | 8 |
| Pricing (input/output) | $2.00 / $12.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Gemini 3.1 Pro public-lane score: 38.5 (Supported · #59/119)
- Gemma 4 31B public-lane score: 21.8 (Estimated · #98/119)

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | 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% | 35.26% | Gemini 3.1 Pro |
| ResearchClawBench | 13.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 70.8% | Coming soon | Coming soon |

### Coding

- Winner: Gemini 3.1 Pro
- Gemini 3.1 Pro public-lane score: 42.5 (Supported · #59/144)
- Gemma 4 31B public-lane score: 35 (Supported · #81/144)

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 82.9% | Coming soon | Coming soon |
| React Native Evals | 78.9% | 75.2% | Gemini 3.1 Pro |
| Vibe Code Bench | 32.03% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 88.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 22.0% | Coming soon | Coming soon |
| SWE-Rebench | Coming soon | 41.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: 54.5 (Unranked · 2 rankable rows)
- Gemma 4 31B public-lane score: 70.2 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 77.1% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.1 Pro public-lane score: 80.1 (#13/49)
- Gemma 4 31B public-lane score: 59.5 (#31/49)

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 83.9% | 76.9% | Gemini 3.1 Pro |
| 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 |

### Knowledge

- Winner: Gemini 3.1 Pro
- Gemini 3.1 Pro public-lane score: 66.6 (Supported · #21/170)
- Gemma 4 31B public-lane score: 39.1 (Supported · #103/170)

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 94.3% | Coming soon | Coming soon |
| HLE w/o tools | 45.4% | 19.5% | Gemini 3.1 Pro |
| HealthBench Hard | 20.6% | Coming soon | Coming soon |
| MedXpertQA (Text) | 71.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 95.5% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 91.0% | Coming soon | Coming soon |
| GPQA | Coming soon | 84.3% | Coming soon |
| MMLU-Pro | Coming soon | 85.2% | Coming soon |
| HLE | Coming soon | 26.5% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: Coming soon
- Gemma 4 31B public-lane score: 91.5 (#12/124)

### Mathematics

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: 54.2 (Unranked · 2 rankable rows)
- Gemma 4 31B public-lane score: Coming soon

| Benchmark | Gemini 3.1 Pro | Gemma 4 31B | 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 Gemma 4 31B?

Gemini 3.1 Pro is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.1 Pro and Gemma 4 31B?

The widest category gap is in knowledge, where the averages are 66.6 for Gemini 3.1 Pro and 39.1 for Gemma 4 31B.

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

Gemini 3.1 Pro currently has 29 sourced benchmark scores on BenchLM.

### How many benchmarks does Gemma 4 31B cover on BenchLM?

Gemma 4 31B currently has 8 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.1 Pro vs Gemma 4 26B A4B](/compare/gemini-3-1-pro-vs-gemma-4-26b-a4b)
- [Gemma 4 31B vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gemma-4-31b)
- [Gemini 3.1 Pro vs Gemma 4 E4B](/compare/gemini-3-1-pro-vs-gemma-4-e4b)
- [Gemma 4 31B vs Gemma 4 E4B](/compare/gemma-4-31b-vs-gemma-4-e4b)

## Explore More

- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [Gemma 4 31B profile](/models/gemma-4-31b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)