# Gemini 3.1 Pro vs GPT-5.5

> Side-by-side benchmark comparison for Gemini 3.1 Pro and GPT-5.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-pro-vs-gpt-5-5
- Last updated: September 10, 2026

- Shared sourced benchmarks: 17
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-5.5 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-5.5 leads overall 72.07 to 69.95.
- The clearest category separation is in agentic, where the averages are 38.9 for Gemini 3.1 Pro and 61 for GPT-5.5.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 32.03% and 69.85%.
- Gemini 3.1 Pro 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 | GPT-5.5 |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.95 | 72.07 |
| Benchmarks Covered | 28 | 39 |
| Pricing (input/output) | $2.00 / $12.00 | $5.00 / $30.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.5
- Gemini 3.1 Pro public-lane score: 38.9 (Supported · #121/152)
- GPT-5.5 public-lane score: 61 (Supported · #17/152)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 57.8% | Coming soon | Coming soon |
| DeepSearchQA | 69.7% | Coming soon | Coming soon |
| τ²-bench results | 95.6% | 98% | GPT-5.5 |
| Gert Labs | 56.87% | 72.93% | GPT-5.5 |
| ResearchClawBench | 13.3% | 17.0% | GPT-5.5 |
| Terminal-Bench 2.1 (Vals) | 70.8% | 76.4% | GPT-5.5 |
| Terminal-Bench 2.0 | Coming soon | 82% | Coming soon |
| CyberGym | Coming soon | 81.8% | Coming soon |
| BrowseComp | Coming soon | 84.4% | Coming soon |
| OSWorld-Verified | Coming soon | 78.7% | Coming soon |
| MCP Atlas | Coming soon | 75.3% | Coming soon |
| Toolathlon | Coming soon | 55.6% | Coming soon |
| OSWorld 2.0 | Coming soon | 13.0% | Coming soon |
| JobBench | Coming soon | 42.7% | Coming soon |
| ExploitGym | Coming soon | 13.4% | Coming soon |
| ApprenticeBench | Coming soon | 20% | Coming soon |

### Coding

- Winner: GPT-5.5
- Gemini 3.1 Pro public-lane score: 46.3 (Supported · #82/151)
- GPT-5.5 public-lane score: 67.6 (Supported · #7/151)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 82.9% | Coming soon | Coming soon |
| React Native Evals | 78.9% | 84.7% | GPT-5.5 |
| Vibe Code Bench | 32.03% | 69.85% | GPT-5.5 |
| LiveCodeBench (Vals) | 88.5% | 85.3% | Gemini 3.1 Pro |
| SWE-bench (Vals) | 78.8% | 82.6% | GPT-5.5 |
| SWE-bench Pro | Coming soon | 58.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 82.0% | Coming soon |
| cursorBench31 | Coming soon | 59.2% | Coming soon |
| cursorBench32 | Coming soon | 58.4% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 43.0% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 79.2 (#12/48)
- GPT-5.5 public-lane score: 71.3 (#19/48)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 83.9% | 81.2% | 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 | 83.2% | Coming soon |
| OfficeQA Pro | Coming soon | 54.1% | Coming soon |

### Reasoning

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 50.6 (Unranked · 2 rankable rows)
- GPT-5.5 public-lane score: 64 (#13/20)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 77.1% | 85% | GPT-5.5 |
| ARC-AGI-3 | 0.4% | 0.4% | GPT-5.5 |
| MRCR v2 64K-128K | Coming soon | 83.1% | Coming soon |
| MRCR v2 128K-256K | Coming soon | 87.5% | Coming soon |

### Knowledge

- Winner: GPT-5.5
- Gemini 3.1 Pro public-lane score: 66.1 (Supported · #21/183)
- GPT-5.5 public-lane score: 72.9 (Supported · #7/183)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 94.3% | 93.6% | Gemini 3.1 Pro |
| HLE w/o tools | 45.4% | 41.4% | 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% | 93.2% | Gemini 3.1 Pro |
| MMLU-Pro (Vals) | 91.0% | 88.1% | Gemini 3.1 Pro |
| GPQA | Coming soon | 93.6% | Coming soon |
| HLE | Coming soon | 52.2% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: Coming soon
- GPT-5.5 public-lane score: 93.2 (#7/123)

### Mathematics

- Winner: Coming soon
- Gemini 3.1 Pro public-lane score: 54.3 (Unranked · 2 rankable rows)
- GPT-5.5 public-lane score: 69.6 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3.1 Pro | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 36.900% | 51.700% | GPT-5.5 |
| FrontierMath v2 (Tier 4) | 16.700% | 35.400% | GPT-5.5 |
| FrontierMath (legacy) | Coming soon | 51.7% | Coming soon |

## FAQ

### Which is better overall, Gemini 3.1 Pro or GPT-5.5?

GPT-5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.1 Pro and GPT-5.5?

The widest category gap is in agentic, where the averages are 38.9 for Gemini 3.1 Pro and 61 for GPT-5.5.

### 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-5.5 cover on BenchLM?

GPT-5.5 currently has 39 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.1 Pro vs GPT-5.5 Pro](/compare/gemini-3-1-pro-vs-gpt-5-5-pro)
- [GPT-5.5 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Gemini 3.1 Pro vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-3-1-pro)
- [GPT-5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-5)

## Explore More

- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [GPT-5.5 profile](/models/gpt-5-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)