# GPT-OSS 120B vs o4-mini

> Side-by-side benchmark comparison for GPT-OSS 120B and o4-mini across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-oss-120b-vs-o4-mini
- Last updated: October 17, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-OSS 120B and o4-mini 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.
- GPT-OSS 120B has the lower published output-token price.
- o4-mini has the larger published context window at 200K.

## Model Snapshot

| Property | GPT-OSS 120B | o4-mini |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 200K |
| Independent public score (not head-to-head) | 37.32 | null |
| Benchmarks Covered | 8 | 7 |
| Pricing (input/output) | $0.00 / $0.00 | $1.10 / $4.40 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 19.5 (Estimated · #110/128)
- o4-mini public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 29.61% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 23 (Estimated · #111/150)
- o4-mini public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 62.4% | Coming soon | Coming soon |
| React Native Evals | 71.6% | Coming soon | Coming soon |
| HumanEval | Coming soon | 97.3% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 61.6 (Unranked · 2 rankable rows)
- o4-mini public-lane score: 67.8 (Unranked · 3 rankable rows)

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| DROP | Coming soon | 77.7% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: Coming soon
- o4-mini public-lane score: 66.4 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 38.6 (Supported · #122/184)
- o4-mini public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 90% | 90% | Tie |
| GPQA | 80.1% | 77.6% | GPT-OSS 120B |
| HLE | 14.9% | Coming soon | Coming soon |
| SimpleQA | Coming soon | 20.2% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: Coming soon
- o4-mini public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| MGSM | Coming soon | 93.7% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: 84.3 (#50/148)
- o4-mini public-lane score: 83.9 (#53/148)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-OSS 120B public-lane score: Coming soon
- o4-mini public-lane score: Coming soon

| Benchmark | GPT-OSS 120B | o4-mini | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 95.8% | Coming soon | Coming soon |
| AIME 2025 | 92.5% | Coming soon | Coming soon |
| MATH-500 | Coming soon | 97.5% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-OSS 120B and o4-mini?

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

- [GPT-OSS 120B vs GPT-OSS 20B](/compare/gpt-oss-120b-vs-gpt-oss-20b)
- [o4-mini vs GPT-OSS 20B](/compare/gpt-oss-20b-vs-o4-mini)
- [GPT-OSS 120B vs o4-mini (high)](/compare/gpt-oss-120b-vs-o4-mini-high)
- [o4-mini vs o4-mini (high)](/compare/o4-mini-vs-o4-mini-high)

## Explore More

- [GPT-OSS 120B profile](/models/gpt-oss-120b)
- [o4-mini profile](/models/o4-mini)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)