Claude Opus 4.1 vs Nemotron 3 Ultra
Nemotron 3 Ultra leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 22.9 to 22.8, and Nemotron 3 Ultra costs 31.3x less per output token ($2.40 vs $75.00 per million). Updated October 23, 2026; 49 benchmarks have a result for both.
Claude Opus 4.1 or Nemotron 3 Ultra: which to pick
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.
Pick Claude Opus 4.1 for work measured by WeirdML or LMArena Text: coding, where it leads.
- Shared results
- 49
- Claude Opus 4.1 only
- 27
- Nemotron 3 Ultra only
- 22
- Like-for-like categories
- 7 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Nemotron 3 Ultra has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Nemotron 3 Ultra
Nemotron 3 Ultra leads, 22.9 against 22.8.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Nemotron 3 Ultra has a AA Agentic Index result, 20.1.
Directional only
Reasoning
GPQA Diamond
Nemotron 3 Ultra
Nemotron 3 Ultra leads, 86.1% against 76.3%.
Same board, both measured
Math
AIME
No call
Only Claude Opus 4.1 has a AIME result, 78.2%.
Directional only
Knowledge
MMLU Pro
Claude Opus 4.1
Claude Opus 4.1 leads, 87.9% against 85.8%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 4.1
Claude Opus 4.1 leads, 1177 against 1145.
Same board, both measured
Long documents
Listed context window
Nemotron 3 Ultra
Nemotron 3 Ultra takes 262K tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Nemotron 3 Ultra
Claude Opus 4.1 $0.052, Nemotron 3 Ultra $0.0018 per turn.
List prices
At a glance
- Coding index
- Claude Opus 4.1 not benchmarked, Nemotron 3 Ultra 30.0 from 3 benchmarks.
- Widest category
- Math, 8.9 points apart on average over 3 shared benchmarks.
- Widest single gap
- LiveCodeBench (Vals AI): Claude Opus 4.1 66.5% against Nemotron 3 Ultra 86.0%, 19.5 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.1 $75.00 against Nemotron 3 Ultra $2.40 per million output tokens, 31.3x apart.
- Context window
- Claude Opus 4.1 takes 200K tokens, Nemotron 3 Ultra 262K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Claude Opus 4.1 | Bars | Nemotron 3 Ultra | Ties |
|---|---|---|---|---|
| Coding | 2 | 2 | ||
| Intelligence | 0 | 2 | ||
| Reasoning | 1 | 5 | ||
| Math | 0 | 3 | ||
| Knowledge | 4 | 4 | ||
| Web design | 8 | 0 | ||
| General | 9 | 9 | ||
| All shared boards | 24 | 25 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index22
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| LMArena WebDev | 1390 | Not measured | Only Claude Opus 4.1 measured |
| AA Coding Index | Not measured | 49.3 | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Vals AI) | 66.5% | 86.0% | Nemotron 3 Ultra |
| SWE-bench Verified (Vals AI) | Not measured | 69.0% | Only Nemotron 3 Ultra measured |
| Vibe Code Bench (Vals AI) | Not measured | 7.6% | Only Nemotron 3 Ultra measured |
| Code migration (Vals AI) | Not measured | 4.9% | Only Nemotron 3 Ultra measured |
| ProgramBench (Vals AI) | Not measured | 0.0% | Only Nemotron 3 Ultra measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 50.9% | Only Nemotron 3 Ultra measured |
| SciCode | Not measured | 40.3% | Only Nemotron 3 Ultra measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 36.4% | Only Nemotron 3 Ultra measured |
| Terminal-Bench | 38.0% | Not measured | Only Claude Opus 4.1 measured |
| FrontierCode | Not measured | 13.6% | Only Nemotron 3 Ultra measured |
| WeirdML | 45.9% | 43.5% | Claude Opus 4.1 |
| Cybench | 42.0% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: coding | 1479 | 1467 | Claude Opus 4.1 |
| LMArena Text: software and IT | 1456 | 1468 | Nemotron 3 Ultra |
| LMArena WebDev: HTML | 1399 | Not measured | Only Claude Opus 4.1 measured |
| SciCode | 4.6% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 25 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.8 | 22.9 | Nemotron 3 Ultra |
| Epoch Capabilities Index | 144.1 | 146.0 | Nemotron 3 Ultra |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 20.1 | Only Nemotron 3 Ultra measured |
| Finance Agent (Vals AI) | Not measured | 37.7% | Only Nemotron 3 Ultra measured |
| Legal Research Bench (Vals AI) | Not measured | 15.4% | Only Nemotron 3 Ultra measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 31.7% | Only Nemotron 3 Ultra measured |
| τ²-Bench Telecom | Not measured | 83.3% | Only Nemotron 3 Ultra measured |
| APEX-Agents | Not measured | 22.7% | Only Nemotron 3 Ultra measured |
| METR time horizons | 66.8% | Not measured | Only Claude Opus 4.1 measured |
| GDPval | 43.6% | Not measured | Only Claude Opus 4.1 measured |
| DeepResearch Bench | 48.3% | Not measured | Only Claude Opus 4.1 measured |
| MCP Atlas | Not measured | 63.1% | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 32 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| GPQA Diamond | 76.3% | 86.1% | Nemotron 3 Ultra |
| MMMU Pro (Vals AI) | 77.5% | Not measured | Only Claude Opus 4.1 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 86.7% | Only Nemotron 3 Ultra measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 28.4% | Only Nemotron 3 Ultra measured |
| GPQA Diamond (Epoch AI run) | 77.3% | 85.4% | Nemotron 3 Ultra |
| SimpleBench | 60.0% | Not measured | Only Claude Opus 4.1 measured |
| Mystery game puzzles | 21.0% | 20.0% | Claude Opus 4.1 |
| EBR-bench | 7.9% | Not measured | Only Claude Opus 4.1 measured |
| VPCT | 35.0% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: hard prompts | 1442 | 1452 | Nemotron 3 Ultra |
| LMArena Text: expert | 1439 | 1472 | Nemotron 3 Ultra |
| LMArena Text: hard prompts in English | 1451 | 1453 | Nemotron 3 Ultra |
| Neither model has a result on the other 11 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AIME | 78.2% | Not measured | Only Claude Opus 4.1 measured |
| MATH 500 (Vals AI) | 95.4% | Not measured | Only Claude Opus 4.1 measured |
| MGSM (Vals AI) | 94.4% | Not measured | Only Claude Opus 4.1 measured |
| OTIS Mock AIME | 68.9% | 86.7% | Nemotron 3 Ultra |
| FrontierMath, tiers 1 to 3 | 12.6% | Not measured | Only Claude Opus 4.1 measured |
| FrontierMath, tier 4 | 2.4% | Not measured | Only Claude Opus 4.1 measured |
| ProofBench | Not measured | 2.0% | Only Nemotron 3 Ultra measured |
| LMArena Text: math | 1431 | 1457 | Nemotron 3 Ultra |
| LMArena Text: mathematical work | 1434 | 1462 | Nemotron 3 Ultra |
| Neither model has a result on the other 5 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index44
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| MMLU Pro | 87.9% | 85.8% | Claude Opus 4.1 |
| LegalBench (Vals AI) | 83.5% | 82.1% | Claude Opus 4.1 |
| CorpFin (Vals AI) | Not measured | 65.5% | Only Nemotron 3 Ultra measured |
| TaxEval (Vals AI) | 73.7% | 73.1% | Claude Opus 4.1 |
| MortgageTax (Vals AI) | 61.1% | Not measured | Only Claude Opus 4.1 measured |
| MedQA (Vals AI) | 93.6% | Not measured | Only Claude Opus 4.1 measured |
| MedCode (Vals AI) | 47.2% | 38.6% | Claude Opus 4.1 |
| LMArena Text: science | 1422 | 1465 | Nemotron 3 Ultra |
| LMArena Text: medicine and healthcare | 1416 | 1455 | Nemotron 3 Ultra |
| LMArena Text: legal and government | 1421 | 1453 | Nemotron 3 Ultra |
| LMArena Text: business and finance | 1405 | 1435 | Nemotron 3 Ultra |
| FACTS Benchmark Suite | 40.4% | Not measured | Only Claude Opus 4.1 measured |
| PRBench Finance | 35.2% | Not measured | Only Claude Opus 4.1 measured |
| PRBench Legal | 34.0% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| Design Arena: websites | 1177 | 1145 | Claude Opus 4.1 |
| Design Arena: UI components | 1162 | 1135 | Claude Opus 4.1 |
| Design Arena: game dev | 1171 | 1138 | Claude Opus 4.1 |
| Design Arena: data viz | 1166 | 1142 | Claude Opus 4.1 |
| Design Arena: 3D | 1154 | 1132 | Claude Opus 4.1 |
| Design Arena: all code categories | 1170 | 1146 | Claude Opus 4.1 |
| Design Arena: SVG | 1152 | 1069 | Claude Opus 4.1 |
| Design Arena: ASCII art | 1167 | 1100 | Claude Opus 4.1 |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index99
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 31.4% | Not measured | Only Claude Opus 4.1 measured |
| MedScribe (Vals AI) | 73.9% | Not measured | Only Claude Opus 4.1 measured |
| IFBench | Not measured | 81.4% | Only Nemotron 3 Ultra measured |
| Long context reasoning (AA-LCR) | Not measured | 79.3% | Only Nemotron 3 Ultra measured |
| DTBench | 80.0% | 90.1% | Nemotron 3 Ultra |
| LMCA | 37.1% | 36.9% | Claude Opus 4.1 |
| Creative writing (Lech Mazur) | 84.7% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text | 1419 | 1445 | Nemotron 3 Ultra |
| LMArena Text: instruction following | 1435 | 1418 | Claude Opus 4.1 |
| LMArena Text: creative writing | 1412 | 1398 | Claude Opus 4.1 |
| LMArena Text: English | 1433 | 1454 | Nemotron 3 Ultra |
| LMArena Text: non-English | 1405 | 1427 | Nemotron 3 Ultra |
| LMArena Text: Chinese | 1427 | 1498 | Nemotron 3 Ultra |
| LMArena Text: German | 1413 | 1474 | Nemotron 3 Ultra |
| LMArena Text: Japanese | 1378 | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: Korean | 1381 | 1385 | Nemotron 3 Ultra |
| LMArena Text: French | 1433 | 1473 | Nemotron 3 Ultra |
| LMArena Text: Spanish | 1448 | 1454 | Nemotron 3 Ultra |
| LMArena Text: Russian | 1422 | 1417 | Claude Opus 4.1 |
| LMArena Text: Polish | 1413 | 1385 | Claude Opus 4.1 |
| LMArena Text: multi-turn | 1444 | 1411 | Claude Opus 4.1 |
| LMArena Text: longer queries | 1455 | 1437 | Claude Opus 4.1 |
| LMArena Text: writing and language | 1418 | 1405 | Claude Opus 4.1 |
| LMArena Text: entertainment and media | 1398 | 1397 | Claude Opus 4.1 |
| MultiChallenge | 57.2% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 23 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 4.1 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Nemotron 3 Ultra costs less
Repository review
50K input + 3K output tokens
Nemotron 3 Ultra costs less
Agent loop
200K input + 10K output tokens
Nemotron 3 Ultra costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Anthropic Claude Opus 4.1 | NVIDIA Nemotron 3 Ultra |
|---|---|---|
| Maker | Anthropic | NVIDIA |
| Weights | No public weights listed | Open weights |
| Released | August 5, 2025 | June 4, 2026 |
| Context window | 200K | 262K |
| Input $/Mtok | $15.00 | $0.60 |
| Output $/Mtok | $75.00 | $2.40 |
| Coding index | Not benchmarked | 30.0 |
| Independent measurements behind it | 1 | 3 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.1 better than Nemotron 3 Ultra for coding?
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for work measured by WeirdML or LMArena Text: coding, where it leads.
Which is cheaper, Claude Opus 4.1 or Nemotron 3 Ultra?
Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Opus 4.1 or Nemotron 3 Ultra?
Nemotron 3 Ultra, with 262K tokens against 200K.
How many benchmarks is the Claude Opus 4.1 vs Nemotron 3 Ultra comparison based on?
49 benchmarks have a result for both models as of October 23, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.