# Gemma 4 31B vs GPT-5.5

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

- Canonical page: https://benchlm.ai/compare/gemma-4-31b-vs-gpt-5-5
- Last updated: September 29, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-5.5 if you want the stronger benchmark profile. Gemma 4 31B 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 68.76 to 44.67.
- The clearest category separation is in agentic, where the averages are 24.4 for Gemma 4 31B and 60.7 for GPT-5.5.
- The biggest single benchmark swing is Gert Labs in Agentic, with scores of 35.26% and 72.93%.
- Gemma 4 31B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.5 also has the larger context window at 1M.

## Model Snapshot

| Property | Gemma 4 31B | GPT-5.5 |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 1M |
| Overall Score | 44.67 | 68.76 |
| Benchmarks Covered | 8 | 39 |
| Pricing (input/output) | $0.00 / $0.00 | $5.00 / $30.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Gemma 4 31B public-lane score: 24.4 (Estimated · #92/117)
- GPT-5.5 public-lane score: 60.7 (Supported · #18/117)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 35.26% | 72.93% | 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 |
| τ²-bench results | Coming soon | 98% | Coming soon |
| ResearchClawBench | Coming soon | 17.0% | 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 |
| Terminal-Bench 2.1 (Vals) | Coming soon | 76.4% | Coming soon |
| ApprenticeBench | Coming soon | 20% | Coming soon |

### Coding

- Winner: GPT-5.5
- Gemma 4 31B public-lane score: 35.5 (Supported · #80/143)
- GPT-5.5 public-lane score: 62.8 (Supported · #14/143)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-Rebench | 41.6% | Coming soon | Coming soon |
| React Native Evals | 75.2% | 84.7% | GPT-5.5 |
| SWE-bench Pro | Coming soon | 58.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 82.0% | Coming soon |
| Vibe Code Bench | Coming soon | 69.85% | 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 |
| LiveCodeBench (Vals) | Coming soon | 85.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 82.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemma 4 31B public-lane score: 70.2 (Unranked · 2 rankable rows)
- GPT-5.5 public-lane score: 66.1 (#16/27)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | Coming soon | 83.1% | Coming soon |
| MRCR v2 128K-256K | Coming soon | 87.5% | Coming soon |
| ARC-AGI-2 | Coming soon | 85% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.4% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemma 4 31B public-lane score: 59.5 (#32/50)
- GPT-5.5 public-lane score: 71.4 (#20/50)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 76.9% | 81.2% | GPT-5.5 |
| MMMU-Pro w/ Python | Coming soon | 83.2% | Coming soon |
| OfficeQA Pro | Coming soon | 54.1% | Coming soon |

### Knowledge

- Winner: GPT-5.5
- Gemma 4 31B public-lane score: 40 (Supported · #99/169)
- GPT-5.5 public-lane score: 69.4 (Supported · #14/169)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 84.3% | 93.6% | GPT-5.5 |
| MMLU-Pro | 85.2% | Coming soon | Coming soon |
| HLE | 26.5% | 52.2% | GPT-5.5 |
| HLE w/o tools | 19.5% | 41.4% | GPT-5.5 |
| GPQA-D | Coming soon | 93.6% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 93.2% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 88.1% | Coming soon |

### Instruction Following

- Winner: Directional only
- Gemma 4 31B public-lane score: 91.5 (#12/124)
- GPT-5.5 public-lane score: 91.9 (#7/124)

### Mathematics

- Winner: Not comparable
- Gemma 4 31B public-lane score: Coming soon
- GPT-5.5 public-lane score: 69.4 (Unranked · 3 rankable rows)

| Benchmark | Gemma 4 31B | GPT-5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 51.7% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 51.700% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 35.400% | Coming soon |

## FAQ

### Which is better overall, Gemma 4 31B or GPT-5.5?

GPT-5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemma 4 31B and GPT-5.5?

The widest category gap is in agentic, where the averages are 24.4 for Gemma 4 31B and 60.7 for GPT-5.5.

### How many benchmarks does Gemma 4 31B cover on BenchLM?

Gemma 4 31B currently has 8 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

- [Gemma 4 31B vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gemma-4-31b)
- [GPT-5.5 vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gpt-5-5)
- [Gemma 4 31B vs Gemma 4 E4B](/compare/gemma-4-31b-vs-gemma-4-e4b)
- [GPT-5.5 vs Gemma 4 E4B](/compare/gemma-4-e4b-vs-gpt-5-5)

## Explore More

- [Gemma 4 31B profile](/models/gemma-4-31b)
- [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)