# Composer 2.5 vs Gemini 3.1 Pro

> Side-by-side benchmark comparison for Composer 2.5 and Gemini 3.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/composer-2-5-vs-gemini-3-1-pro
- Last updated: October 2, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Composer 2.5 and Gemini 3.1 Pro share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Composer 2.5 has the lower published output-token price.
- Gemini 3.1 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | Composer 2.5 | Gemini 3.1 Pro |
|----------|----------|----------|
| Creator | Cursor | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | null | 65.09 |
| Benchmarks Covered | 8 | 29 |
| Pricing (input/output) | $0.50 / $2.50 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 39.3 (Supported · #59/119)

| Benchmark | Composer 2.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 58.4% | 70.8% | Gemini 3.1 Pro |
| Claw-Eval | Coming soon | 57.8% | Coming soon |
| DeepSearchQA | Coming soon | 69.7% | Coming soon |
| τ²-bench results | Coming soon | 95.6% | Coming soon |
| Gert Labs | Coming soon | 56.87% | Coming soon |
| ResearchClawBench | Coming soon | 13.3% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 42.3 (Supported · #61/144)

| Benchmark | Composer 2.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 69.3% | Coming soon | Coming soon |
| SWE Multilingual | 79.8% | Coming soon | Coming soon |
| cursorBench31 | 63.2% | Coming soon | Coming soon |
| CursorBench 3.2 | 56.1% | Coming soon | Coming soon |
| SWE-bench (Vals) | 79.6% | 78.8% | Composer 2.5 |
| CursorBench 4.0 | 27.7% | 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 |
| PostTrainBench v1.1 | Coming soon | 22.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 54.4 (Unranked · 2 rankable rows)

| Benchmark | Composer 2.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 77.1% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.4% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 80.1 (#13/49)

| Benchmark | Composer 2.5 | 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: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 66.2 (Supported · #22/171)

| Benchmark | Composer 2.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| 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: Insufficient shared evidence
- Composer 2.5 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 54.2 (Unranked · 2 rankable rows)

| Benchmark | Composer 2.5 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 36.900% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 16.700% | Coming soon |

## FAQ

### Is there enough evidence to pick between Composer 2.5 and Gemini 3.1 Pro?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Composer 2.5 vs Composer 2](/compare/composer-2-vs-composer-2-5)
- [Gemini 3.1 Pro vs Composer 2](/compare/composer-2-vs-gemini-3-1-pro)
- [Composer 2.5 vs Composer 2 Fast](/compare/composer-2-5-vs-composer-2-fast)
- [Gemini 3.1 Pro vs Composer 2 Fast](/compare/composer-2-fast-vs-gemini-3-1-pro)

## Explore More

- [Composer 2.5 profile](/models/composer-2-5)
- [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)