Model comparison
Claude 4.1 Opus Thinking vs GPT-OSS 120B
Head-to-head evidence from 8 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4.1 Opus Thinking #184 (Supported); GPT-OSS 120B #116 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4.1 Opus Thinking and GPT-OSS 120B share 8 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Claude 4.1 Opus Thinking; 19 to GPT-OSS 120B.
Updated July 20, 2026- Shared results
- 8
- Claude 4.1 Opus Thinking only
- 1
- GPT-OSS 120B only
- 19
- Comparable categories
- 0 / 8
Benchmark data for Claude 4.1 Opus Thinking and GPT-OSS 120B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 8 shared benchmark results across 5 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.
Claude 4.1 Opus Thinking has the larger context window at 200K, compared with 128K for GPT-OSS 120B.
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 | Claude 4.1 Opus Thinking | GPT-OSS 120B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4.1 Opus ThinkingNot available | GPT-OSS 120B$0 input / $0 output | A complete price comparison is not available. |
| Generation speedtokens per second | Claude 4.1 Opus Thinking29 tok/s | GPT-OSS 120B262 tok/s | GPT-OSS 120B has the higher measured throughput. |
| First-answer latencyseconds to first token | Claude 4.1 Opus Thinking15.00 s | GPT-OSS 120B0.79 s | GPT-OSS 120B reaches the first token sooner. |
| Context windowmaximum listed tokens | Claude 4.1 Opus Thinking200K | GPT-OSS 120B128K | Claude 4.1 Opus Thinking lists the larger context window. |
Benchmark Deep Dive
Agentic9 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | GPT-OSS 120B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 71.4% | 65.8% | Claude 4.1 Opus Thinking 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 | Claude 4.1 Opus Thinking | GPT-OSS 120B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 33.7% | 23.8% | Claude 4.1 Opus Thinking leads |
| AA-GPQA DiamondSource | 80.9% | 78.2% | Claude 4.1 Opus Thinking leads |
| AA-HLESource | 11.9% | 18.5% | GPT-OSS 120B leads |
| AA-Omniscience IndexSource | — | -50.0% | Not comparable |
| AA-Omniscience AccuracySource | — | 21.5% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 91.2% | Not comparable |
| AA Openness IndexSource | — | 38.9% | Not comparable |
| AA MMLU-ProSource | — | 80.8% | Not comparable |
Math1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | GPT-OSS 120B | Result |
|---|---|---|---|
| AA AIME 2025Source | — | 93.4% | Not comparable |
Multilingual1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | GPT-OSS 120B | Result |
|---|---|---|---|
| AA Global-MMLU-LiteSource | — | 82.8% | Not comparable |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4.1 Opus Thinking | GPT-OSS 120B | Result |
|---|---|---|---|
| AA-IFBenchSource | 55.4% | 69.0% | GPT-OSS 120B leads |
Frequently Asked Questions (3)
Can I compare Claude 4.1 Opus Thinking 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 Claude 4.1 Opus Thinking and GPT-OSS 120B today?
Claude 4.1 Opus Thinking: Pricing unavailable 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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