Model comparison
Claude Opus 4.5 vs Nemotron 3 Ultra
Head-to-head evidence from 24 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: Claude Opus 4.5 #19; Nemotron 3 Ultra #24
BenchAlign evidence: Claude Opus 4.5 supported; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Opus 4.5 and Nemotron 3 Ultra share 24 comparable benchmark results. 6 of 8 categories are comparable. 36 results are unique to Claude Opus 4.5; 15 to Nemotron 3 Ultra.
Updated July 16, 2026- Shared results
- 24
- Claude Opus 4.5 only
- 36
- Nemotron 3 Ultra only
- 15
- Comparable categories
- 6 / 8
Pick Claude Opus 4.5 if you want the stronger benchmark profile. Nemotron 3 Ultra only becomes the better choice if instruction following is the priority or you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 24 shared benchmark results across 7 evidence categories; 6 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Opus 4.5 is clearly ahead on the provisional aggregate, 71 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in coding, where it averages 71.7 against 58.3. The single biggest benchmark swing on the page is IFBench, 58% to 81.7%. Nemotron 3 Ultra does hit back in instruction following, so the answer changes if that is the part of the workload you care about most.
Claude Opus 4.5 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Nemotron 3 Ultra. That is roughly Infinityx on output cost alone. Nemotron 3 Ultra is the reasoning model in the pair, while Claude Opus 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Nemotron 3 Ultra gives you the larger context window at 1M, compared with 200K for Claude Opus 4.5.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Opus 4.5 | Δ | Nemotron 3 Ultra |
|---|---|---|---|
| Coding | Claude Opus 4.571.7 | Margin← 13.4 | Nemotron 3 Ultra58.3 |
| Inst. Following | Claude Opus 4.569.5 | Margin→ 12.2 | Nemotron 3 Ultra81.7 |
| Agentic | Claude Opus 4.562.6 | Margin← 11.3 | Nemotron 3 Ultra51.3 |
| Knowledge | Claude Opus 4.558.5 | Margin← 4.3 | Nemotron 3 Ultra54.2 |
| Multilingual | Claude Opus 4.585.7 | Margin← 2.7 | Nemotron 3 Ultra83.0 |
| Reasoning | Claude Opus 4.564.4 | Margin← 2.5 | Nemotron 3 Ultra61.9 |
| Math | Claude Opus 4.557.5 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Multimodal | Claude Opus 4.569.9 | MarginNo overlap | Nemotron 3 UltraNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
IFBench
Inst. FollowingA 58%B 81.7%Winner: Nemotron 3 UltraΔ 23.7IFBench: Claude Opus 4.5 scored 58%; Nemotron 3 Ultra scored 81.7%. Nemotron 3 Ultra wins this benchmark. - Source ↗
SWE-bench Verified
CodingA 80.9%B 71.9%Winner: Claude Opus 4.5Δ 9SWE-bench Verified: Claude Opus 4.5 scored 80.9%; Nemotron 3 Ultra scored 71.9%. Claude Opus 4.5 wins this benchmark. - Source ↗
HLE
KnowledgeA 30.8%B 26.7%Winner: Claude Opus 4.5Δ 4.1HLE: Claude Opus 4.5 scored 30.8%; Nemotron 3 Ultra scored 26.7%. Claude Opus 4.5 wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 59.3%B 56.4%Winner: Claude Opus 4.5Δ 2.9Terminal-Bench 2.0: Claude Opus 4.5 scored 59.3%; Nemotron 3 Ultra scored 56.4%. Claude Opus 4.5 wins this benchmark. - Source ↗
MMLU-Pro
KnowledgeA 89.5%B 86.8%Winner: Claude Opus 4.5Δ 2.7MMLU-Pro: Claude Opus 4.5 scored 89.5%; Nemotron 3 Ultra scored 86.8%. Claude Opus 4.5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Opus 4.5 | Nemotron 3 Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Opus 4.5$5 input / $25 output | Nemotron 3 Ultra$0 input / $0 output | Nemotron 3 Ultra has the lower combined listed price. |
| Generation speedtokens per second | Claude Opus 4.546 tok/s | Nemotron 3 UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Opus 4.51.01 s | Nemotron 3 UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Opus 4.5200K | Nemotron 3 Ultra1M | Nemotron 3 Ultra lists the larger context window. |
Benchmark Deep Dive
AgenticClaude Opus 4.5 wins25 benchmarks
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 59.3% | 56.4% | Claude Opus 4.5 leads |
| OSWorld-VerifiedSource | 66.3% | — | Not comparable |
| OSWorldSource | 66.3% | — | Not comparable |
| Claw-EvalSource | 59.6% | — | Not comparable |
| QwenClawBenchSource | 52.3% | — | Not comparable |
| τ³-bench resultsSource | 70.2% | 70.9% | Nemotron 3 Ultra leads |
| VITA-BenchSource | 23.3% | — | Not comparable |
| DeepPlanningSource | 26.4% | — | Not comparable |
| ToolathlonSource | 43.5% | — | Not comparable |
| MCP AtlasSource | 42.3% | — | Not comparable |
| MCP-TasksSource | 71.8% | — | Not comparable |
| WideResearchSource | 76.4% | — | Not comparable |
| CyberGymSource | 50.6% | — | Not comparable |
| τ²-bench resultsSource | 86.3% | 83.3% | Claude Opus 4.5 leads |
| Gert LabsSource | 64.23% | — | Not comparable |
| JobBenchSource | 32.3% | — | Not comparable |
| PinchBenchSource | — | 90.0% | Not comparable |
| BrowseCompSource | — | 44.4% | Not comparable |
| GDPval-AASource | — | 33.2% | Not comparable |
| HLE w/ toolsSource | — | 37.4% | Not comparable |
| AA Agentic IndexSource | — | 27.4% | Not comparable |
| GDPval-AASource | — | 1164 | Not comparable |
| AA BriefcaseSource | — | 870 | Not comparable |
| AA EnterpriseOps-GymSource | — | 28.9% | Not comparable |
| AA Harvey LABSource | — | 3.3% | Not comparable |
CodingClaude Opus 4.5 wins10 benchmarks
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 80.9% | 71.9% | Claude Opus 4.5 leads |
| LiveCodeBench v6Source | 84.8% | 89.0% | Nemotron 3 Ultra leads |
| SWE-bench ProSource | 57.1% | — | Not comparable |
| SWE MultilingualSource | 77.5% | 67.7% | Claude Opus 4.5 leads |
| NL2RepoSource | 43.2% | — | Not comparable |
| Terminal-Bench HardSource | 40.9% | 36.4% | Claude Opus 4.5 leads |
| AA-SciCodeSource | 47.0% | 39.9% | Claude Opus 4.5 leads |
| SciCodeSource | — | 44.6% | Not comparable |
| Terminal-Bench 2.0Source | — | 56.4% | Not comparable |
| AA Coding IndexSource | — | 49.3% | Not comparable |
ReasoningClaude Opus 4.5 wins4 benchmarks
KnowledgeClaude Opus 4.5 wins16 benchmarks
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| GPQASource | 87% | 87% | Tie |
| SuperGPQASource | 70.6% | — | Not comparable |
| MMLU-ProSource | 89.5% | 86.8% | Claude Opus 4.5 leads |
| MMLU-ReduxSource | 96.6% | — | Not comparable |
| C-EvalSource | 92.2% | — | Not comparable |
| HLESource | 30.8% | 26.7% | Claude Opus 4.5 leads |
| Artificial Analysis Intelligence IndexSource | 34.7% | 37.8% | Nemotron 3 Ultra leads |
| AA-GPQA DiamondSource | 81.0% | 86.7% | Nemotron 3 Ultra leads |
| AA-HLESource | 12.9% | 26.6% | Nemotron 3 Ultra leads |
| AA-Omniscience IndexSource | -3.9% | -0.8% | Nemotron 3 Ultra leads |
| AA-Omniscience AccuracySource | 40.7% | 21.6% | Claude Opus 4.5 leads |
| AA-Omniscience Hallucination RateSource | 75.4% | 28.5% | Nemotron 3 Ultra leads |
| AA MMLU-ProSource | 88.9% | — | Not comparable |
| GPQA-DSource | — | 87.0% | Not comparable |
| HLE w/o toolsSource | — | 26.7% | Not comparable |
| AA Openness IndexSource | — | 83.3% | Not comparable |
Math7 benchmarks
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| AIME26Source | 95.1% | — | Not comparable |
| HMMT Feb 2025Source | 92.9% | — | Not comparable |
| HMMT Nov 2025Source | 93.3% | — | Not comparable |
| HMMT Feb 2026Source | 85.3% | — | Not comparable |
| MMAnswerBenchSource | 84.0% | — | Not comparable |
| FrontierMath v2 (Tiers 1-3)Source | 20.690% | — | Not comparable |
| FrontierMath v2 (Tier 4)Source | 4.167% | — | Not comparable |
MultilingualClaude Opus 4.5 wins2 benchmarks
Multimodal8 benchmarks
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| MMMU-ProSource | 70.6% | — | Not comparable |
| MathVisionSource | 74.3% | — | Not comparable |
| CharXivSource | 68.5% | — | Not comparable |
| VideoMMMUSource | 84.4% | — | Not comparable |
| ScreenSpot ProSource | 45.7% | — | Not comparable |
| V*Source | 67.0% | — | Not comparable |
| AA-MMMU-ProSource | 71.2% | — | Not comparable |
| Design Arena WebsiteSource | 1281 | 1132 | Claude Opus 4.5 leads |
Frequently Asked Questions (7)
Which is better, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 is ahead on BenchLM's provisional leaderboard, 71 to 60. The biggest single separator in this matchup is IFBench, where the scores are 58% and 81.7%.
Which is better for knowledge tasks, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 58.5 versus 54.2. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 has the edge for coding in this comparison, averaging 71.7 versus 58.3. Inside this category, SWE Multilingual is the benchmark that creates the most daylight between them.
Which is better for reasoning, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 61.9. Inside this category, CritPt is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 62.6 versus 51.3. Inside this category, τ²-bench results is the benchmark that creates the most daylight between them.
Which is better for instruction following, Claude Opus 4.5 or Nemotron 3 Ultra?
Nemotron 3 Ultra has the edge for instruction following in this comparison, averaging 81.7 versus 69.5. Inside this category, AA-IFBench is the benchmark that creates the most daylight between them.
Which is better for multilingual tasks, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 has the edge for multilingual tasks in this comparison, averaging 85.7 versus 83. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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