# GPT-5.4 vs GPT-OSS 120B

> Side-by-side benchmark comparison for GPT-5.4 and GPT-OSS 120B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-4-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-5.4 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-5.4 leads overall 66.7 to 37.32.
- The clearest category separation is in agentic, where the averages are 52.1 for GPT-5.4 and 19.5 for GPT-OSS 120B.
- The biggest single benchmark swing is HLE in Knowledge, with scores of 52.1% and 14.9%.
- GPT-OSS 120B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.4 also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 | GPT-OSS 120B |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1.05M | 128K |
| Overall Score | 66.7 | 37.32 |
| Benchmarks Covered | 42 | 8 |
| Pricing (input/output) | $2.50 / $15.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- GPT-5.4 public-lane score: 52.1 (Supported · #44/128)
- GPT-OSS 120B public-lane score: 19.5 (Estimated · #110/128)

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 75.1% | Coming soon | Coming soon |
| CyberGym | 79.0% | Coming soon | Coming soon |
| BrowseComp | 82.7% | Coming soon | Coming soon |
| OSWorld-Verified | 75% | Coming soon | Coming soon |
| MCP Atlas | 70.6% | Coming soon | Coming soon |
| Toolathlon | 54.6% | Coming soon | Coming soon |
| τ²-bench results | 98.9% | Coming soon | Coming soon |
| Claw-Eval | 60.3% | Coming soon | Coming soon |
| DeepSearchQA | 73.6% | Coming soon | Coming soon |
| Gert Labs | 64.89% | 29.61% | GPT-5.4 |
| ResearchClawBench | 15.3% | Coming soon | Coming soon |
| JobBench | 38.9% | Coming soon | Coming soon |
| ExploitGym | 6.0% | Coming soon | Coming soon |
| ApprenticeBench | 11% | Coming soon | Coming soon |
| MazeBench | 0% | Coming soon | Coming soon |

### Coding

- Winner: Directional only
- GPT-5.4 public-lane score: 47.7 (Supported · #48/150)
- GPT-OSS 120B public-lane score: 23 (Estimated · #111/150)

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 87.5% | Coming soon | Coming soon |
| SWE-bench Pro | 57.7% | Coming soon | Coming soon |
| React Native Evals | 85.3% | 71.6% | GPT-5.4 |
| Terminal-Bench 2.0 | 75.1% | Coming soon | Coming soon |
| Vibe Code Bench | 67.42% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 19.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 62.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.4 public-lane score: 64.2 (#23/28)
- GPT-OSS 120B public-lane score: 61.6 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 74.0% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.2% | Coming soon | Coming soon |
| ARC-AGI-1 | 93.67% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.4 public-lane score: 73.1 (#30/54)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | Coming soon | Coming soon |
| OfficeQA Pro | 53.2% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82.1% | Coming soon | Coming soon |
| CharXiv | 82.8% | Coming soon | Coming soon |
| ERQA | 65.4% | Coming soon | Coming soon |
| SimpleVQA | 61.1% | Coming soon | Coming soon |
| ScreenSpot Pro | 85.4% | Coming soon | Coming soon |
| ZeroBench | 41.0% | Coming soon | Coming soon |
| MedXpertQA (MM) | 77.1% | Coming soon | Coming soon |

### Knowledge

- Winner: GPT-5.4
- GPT-5.4 public-lane score: 69.1 (Supported · #20/184)
- GPT-OSS 120B public-lane score: 38.6 (Supported · #122/184)

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | 80.1% | GPT-5.4 |
| HLE | 52.1% | 14.9% | GPT-5.4 |
| HLE w/o tools | 39.8% | Coming soon | Coming soon |
| GPQA-D | 92.8% | Coming soon | Coming soon |
| HealthBench Hard | 40.1% | Coming soon | Coming soon |
| MedXpertQA (Text) | 59.6% | Coming soon | Coming soon |
| HealthBench Professional | 48.1% | Coming soon | Coming soon |
| MMLU | Coming soon | 90% | Coming soon |

### Instruction Following

- Winner: Directional only
- GPT-5.4 public-lane score: 90.7 (#23/148)
- GPT-OSS 120B public-lane score: 84.3 (#50/148)

### Mathematics

- Winner: Not comparable
- GPT-5.4 public-lane score: 82 (Unranked · 2 rankable rows)
- GPT-OSS 120B public-lane score: Coming soon

| Benchmark | GPT-5.4 | GPT-OSS 120B | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 78.596% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 49.000% | Coming soon | Coming soon |
| AIME 2024 | Coming soon | 95.8% | Coming soon |
| AIME 2025 | Coming soon | 92.5% | Coming soon |

## FAQ

### Which is better overall, GPT-5.4 or GPT-OSS 120B?

GPT-5.4 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.4 and GPT-OSS 120B?

The widest category gap is in agentic, where the averages are 52.1 for GPT-5.4 and 19.5 for GPT-OSS 120B.

### How many benchmarks does GPT-5.4 cover on BenchLM?

GPT-5.4 currently has 42 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-5.4 vs GPT-5.4 Pro](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [GPT-OSS 120B vs GPT-5.4 Pro](/compare/gpt-5-4-pro-vs-gpt-oss-120b)
- [GPT-5.4 vs GPT-5.4 mini](/compare/gpt-5-4-vs-gpt-5-4-mini)
- [GPT-OSS 120B vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-gpt-oss-120b)

## Explore More

- [GPT-5.4 profile](/models/gpt-5-4)
- [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)