# Gemma 4 31B vs GPT-OSS 120B

> Side-by-side benchmark comparison for Gemma 4 31B and GPT-OSS 120B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemma-4-31b-vs-gpt-oss-120b
- Last updated: October 5, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemma 4 31B and GPT-OSS 120B 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 larger published context window at 256K.

## Model Snapshot

| Property | Gemma 4 31B | GPT-OSS 120B |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 256K | 128K |
| Independent public score (not head-to-head) | 40.44 | 37.28 |
| Benchmarks Covered | 8 | 2 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 18.9 (Estimated · #100/119)
- GPT-OSS 120B public-lane score: 18.9 (Estimated · #99/119)

| Benchmark | Gemma 4 31B | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 35.26% | 29.61% | Gemma 4 31B |

### Coding

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 33.2 (Supported · #85/144)
- GPT-OSS 120B public-lane score: 24.9 (Estimated · #103/144)

| Benchmark | Gemma 4 31B | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| SWE-Rebench | 41.6% | Coming soon | Coming soon |
| React Native Evals | 75.2% | 71.6% | Gemma 4 31B |

### Reasoning

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 70.2 (Unranked · 2 rankable rows)
- GPT-OSS 120B public-lane score: 58 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 59.5 (#31/49)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | Gemma 4 31B | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 76.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 38.6 (Supported · #104/171)
- GPT-OSS 120B public-lane score: 37 (Estimated · #107/171)

| Benchmark | Gemma 4 31B | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 84.3% | Coming soon | Coming soon |
| MMLU-Pro | 85.2% | Coming soon | Coming soon |
| HLE | 26.5% | Coming soon | Coming soon |
| HLE w/o tools | 19.5% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemma 4 31B public-lane score: 91.5 (#13/125)
- GPT-OSS 120B public-lane score: 82.8 (#45/125)

## FAQ

### Is there enough evidence to pick between Gemma 4 31B and GPT-OSS 120B?

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-OSS 120B vs Gemma 4 26B A4B](/compare/gemma-4-26b-a4b-vs-gpt-oss-120b)
- [Gemma 4 31B vs Gemma 4 12B](/compare/gemma-4-12b-vs-gemma-4-31b)
- [GPT-OSS 120B vs Gemma 4 12B](/compare/gemma-4-12b-vs-gpt-oss-120b)

## Explore More

- [Gemma 4 31B profile](/models/gemma-4-31b)
- [GPT-OSS 120B profile](/models/gpt-oss-120b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)