Model comparison
DeepSeek V3.1 (Reasoning) vs GPT-OSS 120B
Head-to-head evidence from 12 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: DeepSeek V3.1 (Reasoning) #97 (Supported); GPT-OSS 120B #116 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. DeepSeek V3.1 (Reasoning) and GPT-OSS 120B share 12 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to DeepSeek V3.1 (Reasoning); 15 to GPT-OSS 120B.
Updated July 20, 2026- Shared results
- 12
- DeepSeek V3.1 (Reasoning) only
- 0
- GPT-OSS 120B only
- 15
- Comparable categories
- 0 / 8
Benchmark data for DeepSeek V3.1 (Reasoning) and GPT-OSS 120B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 12 shared benchmark results across 6 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | DeepSeek V3.1 (Reasoning)$0 input / $0 output | GPT-OSS 120B$0 input / $0 output | Listed prices are equal. |
| Generation speedtokens per second | DeepSeek V3.1 (Reasoning)Not available | GPT-OSS 120B262 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | DeepSeek V3.1 (Reasoning)Not available | GPT-OSS 120B0.79 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | DeepSeek V3.1 (Reasoning)128K | GPT-OSS 120B128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic9 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 37.4% | 65.8% | GPT-OSS 120B leads |
| AA Agentic IndexSource | — | 13.2% | Not comparable |
| APEX-Agents-AASource | — | 3.1% | Not comparable |
| GDPval-AASource | — | 15.0% | Not comparable |
| GDPval-AASource | — | 799 | Not comparable |
| Gert LabsSource | — | 29.61% | Not comparable |
| AA EnterpriseOps-GymSource | — | 25.5% | Not comparable |
| AA Harvey LABSource | — | 0.0% | Not comparable |
| AA ITBenchSource | — | 5.6% | Not comparable |
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 20.7% | 23.8% | GPT-OSS 120B leads |
| AA-GPQA DiamondSource | 77.9% | 78.2% | GPT-OSS 120B leads |
| AA-HLESource | 13.0% | 18.5% | GPT-OSS 120B leads |
| AA-Omniscience IndexSource | -28.4% | -50.0% | DeepSeek V3.1 (Reasoning) leads |
| AA-Omniscience AccuracySource | 28.8% | 21.5% | DeepSeek V3.1 (Reasoning) leads |
| AA-Omniscience Hallucination RateSource | 80.3% | 91.2% | DeepSeek V3.1 (Reasoning) leads |
| AA Openness IndexSource | — | 38.9% | Not comparable |
| AA MMLU-ProSource | — | 80.8% | Not comparable |
Math1 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| AA AIME 2025Source | — | 93.4% | Not comparable |
Multilingual1 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| AA Global-MMLU-LiteSource | — | 82.8% | Not comparable |
Multimodal1 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1155 | 1000 | DeepSeek V3.1 (Reasoning) leads |
Inst. Following1 benchmarks
| Benchmark | DeepSeek V3.1 (Reasoning) | GPT-OSS 120B | Result |
|---|---|---|---|
| AA-IFBenchSource | 41.5% | 69.0% | GPT-OSS 120B leads |
Frequently Asked Questions (3)
Can I compare DeepSeek V3.1 (Reasoning) and GPT-OSS 120B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for DeepSeek V3.1 (Reasoning) and GPT-OSS 120B today?
DeepSeek V3.1 (Reasoning): $0.00 input / $0.00 output per 1M tokens GPT-OSS 120B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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