# Claude Sonnet 4.5 vs Gemini 3.1 Pro

> Side-by-side benchmark comparison for Claude Sonnet 4.5 and Gemini 3.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-5-vs-gemini-3-1-pro
- Last updated: October 17, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Gemini 3.1 Pro leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Gemini 3.1 Pro has the higher overall point estimate 64.7 to 47.96. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 22.9 for Claude Sonnet 4.5 and 58.2 for Gemini 3.1 Pro.
- The biggest single benchmark swing is ARC-AGI-2 in Reasoning, with scores of 13.6% and 77.1%.
- Gemini 3.1 Pro 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 | Claude Sonnet 4.5 | Gemini 3.1 Pro |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Overall Score | 47.96 | 64.7 |
| Benchmarks Covered | 12 | 30 |
| Pricing (input/output) | $3.00 / $15.00 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Sonnet 4.5 public-lane score: 35.1 (Estimated · #81/128)
- Gemini 3.1 Pro public-lane score: 38.4 (Supported · #70/128)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | Coming soon | Coming soon |
| OSWorld-Verified | 61.4% | Coming soon | Coming soon |
| VITA-Bench | 17.0% | Coming soon | Coming soon |
| Gert Labs | 48.51% | 56.87% | Gemini 3.1 Pro |
| JobBench | 27.7% | Coming soon | Coming soon |
| Claw-Eval | Coming soon | 57.8% | Coming soon |
| DeepSearchQA | Coming soon | 69.7% | Coming soon |
| τ²-bench results | Coming soon | 95.6% | Coming soon |
| ResearchClawBench | Coming soon | 13.3% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 70.8% | Coming soon |
| MazeBench | Coming soon | 1% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 39.2 (Supported · #67/150)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 50.0% | Coming soon | Coming soon |
| LiveCodeBench Pro | Coming soon | 82.9% | Coming soon |
| React Native Evals | Coming soon | 78.9% | Coming soon |
| Vibe Code Bench | Coming soon | 32.03% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 88.5% | Coming soon |
| SWE-bench (Vals) | Coming soon | 78.8% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 22.0% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 22.9 (Unranked · 1 rankable row)
- Gemini 3.1 Pro public-lane score: 58.2 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | 77.1% | Gemini 3.1 Pro |
| ARC-AGI-3 | Coming soon | 0.4% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 80.1 (#17/54)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 83.9% | Coming soon |
| CharXiv | Coming soon | 80.2% | Coming soon |
| ERQA | Coming soon | 69.4% | Coming soon |
| SimpleVQA | Coming soon | 72.4% | Coming soon |
| ScreenSpot Pro | Coming soon | 84.4% | Coming soon |
| ZeroBench | Coming soon | 29.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 81.3% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 67.6 (Supported · #26/184)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 94.3% | Coming soon |
| HLE w/o tools | Coming soon | 45.4% | Coming soon |
| HealthBench Hard | Coming soon | 20.6% | Coming soon |
| MedXpertQA (Text) | Coming soon | 71.5% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 95.5% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 91.0% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Sonnet 4.5 public-lane score: 36.4 (Unranked · 2 rankable rows)
- Gemini 3.1 Pro public-lane score: 65 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 23.860% | 59.649% | Gemini 3.1 Pro |
| FrontierMath v2 (Tier 4) | 2.439% | 26.829% | Gemini 3.1 Pro |

## FAQ

### Which is better overall, Claude Sonnet 4.5 or Gemini 3.1 Pro?

Gemini 3.1 Pro has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Sonnet 4.5 and Gemini 3.1 Pro?

The widest category gap is in reasoning, where the averages are 22.9 for Claude Sonnet 4.5 and 58.2 for Gemini 3.1 Pro.

### How many benchmarks does Claude Sonnet 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 12 sourced benchmark scores on BenchLM.

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

Gemini 3.1 Pro currently has 30 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [Gemini 3.1 Pro vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-gemini-3-1-pro)
- [Claude Sonnet 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-4-5)
- [Gemini 3.1 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-1-pro)

## Explore More

- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)