# Gemma 4 31B vs GPT-5.5 Pro

> Side-by-side benchmark comparison for Gemma 4 31B and GPT-5.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemma-4-31b-vs-gpt-5-5-pro
- Last updated: September 4, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemma 4 31B and GPT-5.5 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.
- Gemma 4 31B has the lower published output-token price.
- GPT-5.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | Gemma 4 31B | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 1M |
| Independent public score (not head-to-head) | 58.69 | 63.07 |
| Benchmarks Covered | 8 | 6 |
| Pricing (input/output) | $0.00 / $0.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 27.6 (Supported · #140/151)
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)

| Benchmark | Gemma 4 31B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 35.26% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 90.1% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 43.5 (Supported · #123/183)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemma 4 31B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| SWE-Rebench | 41.6% | Coming soon | Coming soon |
| React Native Evals | 75.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 58.4 (#30/48)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemma 4 31B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 76.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 70.1 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 47.9 (Supported · #104/181)
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)

| Benchmark | Gemma 4 31B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 84.3% | Coming soon | Coming soon |
| MMLU-Pro | 85.2% | Coming soon | Coming soon |
| HLE | 26.5% | 57.2% | GPT-5.5 Pro |
| HLE w/o tools | 19.5% | 43.1% | GPT-5.5 Pro |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 92.6 (#12/120)
- GPT-5.5 Pro public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: Coming soon
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)

| Benchmark | Gemma 4 31B | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 52.4% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 51.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 39.600% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemma 4 31B and GPT-5.5 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

- [Gemma 4 31B vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gemma-4-31b)
- [GPT-5.5 Pro vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gpt-5-5-pro)
- [Gemma 4 31B vs Gemma 4 12B](/compare/gemma-4-12b-vs-gemma-4-31b)
- [GPT-5.5 Pro vs Gemma 4 12B](/compare/gemma-4-12b-vs-gpt-5-5-pro)

## Explore More

- [Gemma 4 31B profile](/models/gemma-4-31b)
- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)