Model comparison
Claude Sonnet 4.5 vs Nemotron 3 Ultra
Head-to-head evidence from 4 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: Claude Sonnet 4.5 unranked; Nemotron 3 Ultra #24
BenchAlign evidence: Claude Sonnet 4.5 estimated; Nemotron 3 Ultra not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 4.5 and Nemotron 3 Ultra share 4 comparable benchmark results. 4 of 8 categories are comparable. 8 results are unique to Claude Sonnet 4.5; 35 to Nemotron 3 Ultra.
Updated July 16, 2026- Shared results
- 4
- Claude Sonnet 4.5 only
- 8
- Nemotron 3 Ultra only
- 35
- Comparable categories
- 4 / 8
Pick Nemotron 3 Ultra if you want the stronger benchmark profile. Claude Sonnet 4.5 only becomes the better choice if knowledge is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 4 shared benchmark results across 4 evidence categories; 4 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Nemotron 3 Ultra finishes one point ahead on BenchLM's provisional leaderboard, 60 to 59. That is enough to call, but not enough to treat as a blowout. This matchup comes down to a few meaningful edges rather than one model dominating the board.
Nemotron 3 Ultra's sharpest advantage is in reasoning, where it averages 61.9 against 13.6. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 50% to 56.4%. Claude Sonnet 4.5 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Claude Sonnet 4.5 is also the more expensive model on tokens at $3.00 input / $15.00 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 Sonnet 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 Sonnet 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 Sonnet 4.5 | Δ | Nemotron 3 Ultra |
|---|---|---|---|
| Reasoning | Claude Sonnet 4.513.6 | Margin→ 48.3 | Nemotron 3 Ultra61.9 |
| Knowledge | Claude Sonnet 4.583.4 | Margin← 29.2 | Nemotron 3 Ultra54.2 |
| Coding | Claude Sonnet 4.577.2 | Margin← 18.9 | Nemotron 3 Ultra58.3 |
| Agentic | Claude Sonnet 4.555.4 | Margin← 4.1 | Nemotron 3 Ultra51.3 |
| Math | Claude Sonnet 4.511.2 | MarginNo overlap | Nemotron 3 UltraNot measured |
| Multilingual | Claude Sonnet 4.5Not measured | MarginNo overlap | Nemotron 3 Ultra83.0 |
| Inst. Following | Claude Sonnet 4.5Not measured | MarginNo overlap | Nemotron 3 Ultra81.7 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
Terminal-Bench 2.0
AgenticA 50%B 56.4%Winner: Nemotron 3 UltraΔ 6.4Terminal-Bench 2.0: Claude Sonnet 4.5 scored 50%; Nemotron 3 Ultra scored 56.4%. Nemotron 3 Ultra wins this benchmark. - Source ↗
SWE-bench Verified
CodingA 77.2%B 71.9%Winner: Claude Sonnet 4.5Δ 5.3SWE-bench Verified: Claude Sonnet 4.5 scored 77.2%; Nemotron 3 Ultra scored 71.9%. Claude Sonnet 4.5 wins this benchmark. - Source ↗
GPQA
KnowledgeA 83.4%B 87%Winner: Nemotron 3 UltraΔ 3.6GPQA: Claude Sonnet 4.5 scored 83.4%; Nemotron 3 Ultra scored 87%. Nemotron 3 Ultra wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Sonnet 4.5 | Nemotron 3 Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 4.5$3 input / $15 output | Nemotron 3 Ultra$0 input / $0 output | Nemotron 3 Ultra has the lower combined listed price. |
| Generation speedtokens per second | Claude Sonnet 4.5Not available | Nemotron 3 UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 4.5Not available | Nemotron 3 UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 4.5200K | Nemotron 3 Ultra1M | Nemotron 3 Ultra lists the larger context window. |
Benchmark Deep Dive
AgenticClaude Sonnet 4.5 wins16 benchmarks
| Benchmark | Claude Sonnet 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 50% | 56.4% | Nemotron 3 Ultra leads |
| OSWorld-VerifiedSource | 61.4% | — | Not comparable |
| VITA-BenchSource | 17.0% | — | Not comparable |
| Gert LabsSource | 48.51% | — | Not comparable |
| JobBenchSource | 27.7% | — | Not comparable |
| PinchBenchSource | — | 90.0% | Not comparable |
| BrowseCompSource | — | 44.4% | Not comparable |
| τ³-bench resultsSource | — | 70.9% | Not comparable |
| GDPval-AASource | — | 33.2% | Not comparable |
| HLE w/ toolsSource | — | 37.4% | Not comparable |
| AA Agentic IndexSource | — | 27.4% | Not comparable |
| τ²-bench resultsSource | — | 83.3% | 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 Sonnet 4.5 wins8 benchmarks
| Benchmark | Claude Sonnet 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 77.2% | 71.9% | Claude Sonnet 4.5 leads |
| SWE MultilingualSource | — | 67.7% | Not comparable |
| LiveCodeBench v6Source | — | 89.0% | Not comparable |
| SciCodeSource | — | 44.6% | Not comparable |
| Terminal-Bench 2.0Source | — | 56.4% | Not comparable |
| AA Coding IndexSource | — | 49.3% | Not comparable |
| Terminal-Bench HardSource | — | 36.4% | Not comparable |
| AA-SciCodeSource | — | 39.9% | Not comparable |
ReasoningNemotron 3 Ultra wins4 benchmarks
KnowledgeClaude Sonnet 4.5 wins12 benchmarks
| Benchmark | Claude Sonnet 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| GPQASource | 83.4% | 87% | Nemotron 3 Ultra leads |
| GPQA-DSource | — | 87.0% | Not comparable |
| HLESource | — | 26.7% | Not comparable |
| HLE w/o toolsSource | — | 26.7% | Not comparable |
| MMLU-ProSource | — | 86.8% | Not comparable |
| AA-Omniscience AccuracySource | — | 21.6% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 37.8% | Not comparable |
| AA-GPQA DiamondSource | — | 86.7% | Not comparable |
| AA-HLESource | — | 26.6% | Not comparable |
| AA-Omniscience IndexSource | — | -0.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 28.5% | Not comparable |
| AA Openness IndexSource | — | 83.3% | Not comparable |
Math3 benchmarks
Multilingual1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| MMLU-ProXSource | — | 83% | Not comparable |
Multimodal1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Nemotron 3 Ultra | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1224 | 1132 | Claude Sonnet 4.5 leads |
Frequently Asked Questions (5)
Which is better, Claude Sonnet 4.5 or Nemotron 3 Ultra?
Nemotron 3 Ultra is ahead on BenchLM's provisional leaderboard, 60 to 59. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 50% and 56.4%.
Which is better for knowledge tasks, Claude Sonnet 4.5 or Nemotron 3 Ultra?
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 83.4 versus 54.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Sonnet 4.5 or Nemotron 3 Ultra?
Claude Sonnet 4.5 has the edge for coding in this comparison, averaging 77.2 versus 58.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Which is better for reasoning, Claude Sonnet 4.5 or Nemotron 3 Ultra?
Nemotron 3 Ultra has the edge for reasoning in this comparison, averaging 61.9 versus 13.6. Claude Sonnet 4.5 stays close enough that the answer can still flip depending on your workload.
Which is better for agentic tasks, Claude Sonnet 4.5 or Nemotron 3 Ultra?
Claude Sonnet 4.5 has the edge for agentic tasks in this comparison, averaging 55.4 versus 51.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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