# Gemini 3.1 Pro vs GPT-5.6 Sol

> Side-by-side benchmark comparison for Gemini 3.1 Pro and GPT-5.6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-pro-vs-gpt-5-6-sol
- Last updated: September 24, 2026

- Shared sourced benchmarks: 12
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-5.6 Sol if you want the stronger benchmark profile. Gemini 3.1 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Sol leads overall 78.49 to 64.45.
- The clearest category separation is in mathematics, where the averages are 54.2 for Gemini 3.1 Pro and 96.8 for GPT-5.6 Sol.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 16.700% and 83.000%.
- Gemini 3.1 Pro is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Sol also has the larger context window at 1.05M.

## Model Snapshot

| Property | Gemini 3.1 Pro | GPT-5.6 Sol |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 64.45 | 78.49 |
| Benchmarks Covered | 28 | 37 |
| Pricing (input/output) | $2.00 / $12.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.6 Sol
- Gemini 3.1 Pro public-lane score: 39.3 (Supported · #47/105)
- GPT-5.6 Sol public-lane score: 69.6 (Supported · #7/105)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | 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% | Coming soon | Coming soon |
| ResearchClawBench | 13.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 70.8% | 85.8% | GPT-5.6 Sol |
| Terminal-Bench 3.0 | Coming soon | 34.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 91.9% | Coming soon |
| BrowseComp | Coming soon | 92.2% | Coming soon |
| OSWorld 2.0 | Coming soon | 62.6% | Coming soon |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 33.7% | Coming soon |
| Toolathlon | Coming soon | 58% | Coming soon |
| ApprenticeBench | Coming soon | 26% | Coming soon |

### Coding

- Winner: GPT-5.6 Sol
- Gemini 3.1 Pro public-lane score: 43.3 (Supported · #52/135)
- GPT-5.6 Sol public-lane score: 71.6 (Supported · #6/135)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | 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% | 82.6% | Gemini 3.1 Pro |
| SWE-bench (Vals) | 78.8% | 96.2% | GPT-5.6 Sol |
| Bug Hunt Bench | Coming soon | 42 fixes | Coming soon |
| SWE-bench Pro | Coming soon | 64.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 91.9% | Coming soon |
| DeepSWE | Coming soon | 72.7% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 60.6% | Coming soon |
| FrontierSWE v2 | Coming soon | 32.2% | Coming soon |
| cursorBench32 | Coming soon | 67.2% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| VulcanBench CII v1 | Coming soon | 86.5% | Coming soon |
| cursorBench40 | Coming soon | 41.7% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: 54.4 (Unranked · 2 rankable rows)
- GPT-5.6 Sol public-lane score: 72.1 (#8/19)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 77.1% | 92.5% | GPT-5.6 Sol |
| ARC-AGI-3 | 0.4% | 7.8% | GPT-5.6 Sol |
| GeneBench-Pro | Coming soon | 28.7% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.1 Pro public-lane score: 79.1 (#13/50)
- GPT-5.6 Sol public-lane score: 87.6 (#5/50)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 83.9% | 83% | 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 |
| MMMU-Pro w/ Python | Coming soon | 84.6% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Sol
- Gemini 3.1 Pro public-lane score: 66.7 (Supported · #18/158)
- GPT-5.6 Sol public-lane score: 78.8 (Supported · #7/158)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 94.3% | 94.6% | GPT-5.6 Sol |
| HLE w/o tools | 45.4% | Coming soon | Coming soon |
| HealthBench Hard | 20.6% | 33.1% | GPT-5.6 Sol |
| MedXpertQA (Text) | 71.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 95.5% | 95.2% | Gemini 3.1 Pro |
| MMLU-Pro (Vals) | 91.0% | 89.1% | Gemini 3.1 Pro |
| GPQA | Coming soon | 94.6% | Coming soon |
| HLE-Verified | Coming soon | 54.5% | Coming soon |
| LABBench2 | Coming soon | 82.1% | Coming soon |
| HealthBench Professional | Coming soon | 60.5% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 87.7 (#28/124)

### Mathematics

- Winner: Not comparable
- Gemini 3.1 Pro public-lane score: 54.2 (Unranked · 2 rankable rows)
- GPT-5.6 Sol public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3.1 Pro | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 36.900% | 89.000% | GPT-5.6 Sol |
| FrontierMath v2 (Tier 4) | 16.700% | 83.000% | GPT-5.6 Sol |
| FrontierMath (legacy) | Coming soon | 89% | Coming soon |

## FAQ

### Which is better overall, Gemini 3.1 Pro or GPT-5.6 Sol?

GPT-5.6 Sol is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.1 Pro and GPT-5.6 Sol?

The widest category gap is in mathematics, where the averages are 54.2 for Gemini 3.1 Pro and 96.8 for GPT-5.6 Sol.

### 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 GPT-5.6 Sol cover on BenchLM?

GPT-5.6 Sol currently has 37 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.1 Pro vs GPT-5.6 Terra](/compare/gemini-3-1-pro-vs-gpt-5-6-terra)
- [GPT-5.6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Gemini 3.1 Pro vs GPT-5.6 Luna](/compare/gemini-3-1-pro-vs-gpt-5-6-luna)
- [GPT-5.6 Sol vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)

## Explore More

- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [GPT-5.6 Sol profile](/models/gpt-5-6-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)