# GPT-5.2 vs GPT-OSS 120B

> Side-by-side benchmark comparison for GPT-5.2 and GPT-OSS 120B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-2-vs-gpt-oss-120b
- Last updated: October 17, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-5.2 if you want the stronger benchmark profile. GPT-OSS 120B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.2 leads overall 59.86 to 37.32.
- The clearest category separation is in agentic, where the averages are 44.4 for GPT-5.2 and 19.5 for GPT-OSS 120B.
- The biggest single benchmark swing is SWE-bench Verified in Coding, with scores of 80% and 62.4%.
- GPT-OSS 120B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.2 also has the larger context window at 400K.

## Model Snapshot

| Property | GPT-5.2 | GPT-OSS 120B |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | 128K |
| Overall Score | 59.86 | 37.32 |
| Benchmarks Covered | 31 | 8 |
| Pricing (input/output) | $1.75 / $14.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.2 public-lane score: 44.4 (Supported · #58/128)
- GPT-OSS 120B public-lane score: 19.5 (Estimated · #110/128)

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 65.8% | Coming soon | Coming soon |
| OSWorld-Verified | 47.3% | Coming soon | Coming soon |
| Gert Labs | 46.54% | 29.61% | GPT-5.2 |
| JobBench | 34.3% | Coming soon | Coming soon |

### Coding

- Winner: Directional only
- GPT-5.2 public-lane score: 36.8 (Supported · #73/150)
- GPT-OSS 120B public-lane score: 23 (Estimated · #111/150)

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80% | 62.4% | GPT-5.2 |
| SWE-bench Pro | 55.6% | Coming soon | Coming soon |
| Vibe Code Bench | 53.50% | Coming soon | Coming soon |
| React Native Evals | Coming soon | 71.6% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.2 public-lane score: 64.3 (Unranked · 4 rankable rows)
- GPT-OSS 120B public-lane score: 61.6 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.9% | Coming soon | Coming soon |
| ARC-AGI-1 | 86.17% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.2 public-lane score: 75.9 (#22/54)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | 86.7% | Coming soon | Coming soon |
| MMMU-Pro | 79.5% | Coming soon | Coming soon |
| RealWorldQA | 83.3% | Coming soon | Coming soon |
| OmniDocBench 1.5 | 85.7% | Coming soon | Coming soon |
| Video-MME (with subtitle) | 86.0% | Coming soon | Coming soon |
| Video-MME (w/o subtitle) | 85.8% | Coming soon | Coming soon |
| MathVision | 83.0% | Coming soon | Coming soon |
| We-Math | 79.0% | Coming soon | Coming soon |
| DynaMath | 86.8% | Coming soon | Coming soon |
| SimpleVQA | 55.8% | Coming soon | Coming soon |
| CC-OCR | 70.3% | Coming soon | Coming soon |
| AI2D_TEST | 92.2% | Coming soon | Coming soon |
| CountBench | 91.9% | Coming soon | Coming soon |
| ERQA | 59.8% | Coming soon | Coming soon |
| VideoMMMU | 85.9% | Coming soon | Coming soon |
| MLVU (M-Avg) | 85.6% | Coming soon | Coming soon |
| CharXiv | 82.1% | Coming soon | Coming soon |
| V* | 75.9% | Coming soon | Coming soon |

### Knowledge

- Winner: GPT-5.2
- GPT-5.2 public-lane score: 59.7 (Supported · #50/184)
- GPT-OSS 120B public-lane score: 38.6 (Supported · #122/184)

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.4% | 80.1% | GPT-5.2 |
| MMLU | Coming soon | 90% | Coming soon |
| HLE | Coming soon | 14.9% | Coming soon |

### Instruction Following

- Winner: Directional only
- GPT-5.2 public-lane score: 92.6 (#19/148)
- GPT-OSS 120B public-lane score: 84.3 (#50/148)

### Mathematics

- Winner: Not comparable
- GPT-5.2 public-lane score: 71.1 (Unranked · 3 rankable rows)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | GPT-5.2 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 100% | 92.5% | GPT-5.2 |
| FrontierMath v2 (Tiers 1-3) | 67.400% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 31.700% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 95.8% | Coming soon |

## FAQ

### Which is better overall, GPT-5.2 or GPT-OSS 120B?

GPT-5.2 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.2 and GPT-OSS 120B?

The widest category gap is in agentic, where the averages are 44.4 for GPT-5.2 and 19.5 for GPT-OSS 120B.

### How many benchmarks does GPT-5.2 cover on BenchLM?

GPT-5.2 currently has 31 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-OSS 120B cover on BenchLM?

GPT-OSS 120B currently has 8 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.2 vs GPT-5.2 Pro](/compare/gpt-5-2-vs-gpt-5-2-pro)
- [GPT-OSS 120B vs GPT-5.2 Pro](/compare/gpt-5-2-pro-vs-gpt-oss-120b)
- [GPT-5.2 vs GPT-5.2 Instant](/compare/gpt-5-2-vs-gpt-5-2-instant)
- [GPT-OSS 120B vs GPT-5.2 Instant](/compare/gpt-5-2-instant-vs-gpt-oss-120b)

## Explore More

- [GPT-5.2 profile](/models/gpt-5-2)
- [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)