Claude Opus 4.5 vs Nemotron 3 Ultra
Claude Opus 4.5 leads Nemotron 3 Ultra on coding, 44.0 to 30.0 on the Vibe Coding Index, and Nemotron 3 Ultra costs 10.4x less per output token ($2.40 vs $25.00 per million). Updated October 22, 2026; 60 benchmarks have a result for both.
Claude Opus 4.5 or Nemotron 3 Ultra: which to pick
Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra.
Pick Nemotron 3 Ultra for output tokens 10.4x cheaper ($2.40 vs $25.00 per million) and a larger context window (262K against 200K tokens).
- Shared results
- 60
- Claude Opus 4.5 only
- 52
- Nemotron 3 Ultra only
- 11
- Like-for-like categories
- 8 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
Claude Opus 4.5
Claude Opus 4.5 scores 44.0 against 30.0.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
Claude Opus 4.5
Claude Opus 4.5 leads, 29.1 against 22.9.
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 85.9%.
Same board, both measured
Math
AIME
No call
Only Claude Opus 4.5 has a AIME result, 95.4%.
Directional only
Knowledge
MMLU Pro
Claude Opus 4.5
Claude Opus 4.5 leads, 87.3% against 85.8%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 4.5
Claude Opus 4.5 leads, 1247 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 4.5 $0.018, Nemotron 3 Ultra $0.0018 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Opus 4.5 has the number, $1.37.
Directional only
At a glance
- Coding index
- Claude Opus 4.5 44.0 from 3 benchmarks, Nemotron 3 Ultra 30.0 from 3 benchmarks.
- Widest category
- Web design, 12.1 points apart on average over 8 shared benchmarks.
- Widest single gap
- ProofBench: Claude Opus 4.5 36.0% against Nemotron 3 Ultra 2.0%, 34.0 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.5 $25.00 against Nemotron 3 Ultra $2.40 per million output tokens, 10.4x apart.
- Context window
- Claude Opus 4.5 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 4.5 | Bars | Nemotron 3 Ultra | Ties |
|---|---|---|---|---|
| Coding | 6 | 1 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 6 | 2 | ||
| Math | 3 | 1 | ||
| Knowledge | 6 | 3 | ||
| Web design | 8 | 0 | ||
| General | 14 | 6 | ||
| All shared boards | 47 | 13 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index61
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| SWE-bench Verified | 79.2% | Not measured | Only Claude Opus 4.5 measured |
| SWE-bench (full test set) | 52.6% | Not measured | Only Claude Opus 4.5 measured |
| SWE-bench Multilingual | 70.7% | Not measured | Only Claude Opus 4.5 measured |
| LMArena WebDev | 1494 | Not measured | Only Claude Opus 4.5 measured |
| AA Coding Index | Not measured | 49.3 | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Vals AI) | 83.7% | 86.0% | Nemotron 3 Ultra |
| SWE-bench Verified (Vals AI) | 76.4% | 69.0% | Claude Opus 4.5 |
| Vibe Code Bench (Vals AI) | 20.6% | 7.6% | Claude Opus 4.5 |
| 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 |
| LiveCodeBench (Artificial Analysis run) | 87.1% | Not measured | Only Claude Opus 4.5 measured |
| SciCode | Not measured | 40.3% | Only Nemotron 3 Ultra measured |
| Terminal-Bench Hard (Artificial Analysis run) | 47.0% | 36.4% | Claude Opus 4.5 |
| Terminal-Bench | 63.1% | Not measured | Only Claude Opus 4.5 measured |
| FrontierCode | Not measured | 13.6% | Only Nemotron 3 Ultra measured |
| GSO-Bench | 26.5% | Not measured | Only Claude Opus 4.5 measured |
| WeirdML | 63.7% | 43.5% | Claude Opus 4.5 |
| Cybench | 82.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: coding | 1503 | 1468 | Claude Opus 4.5 |
| LMArena Text: software and IT | 1483 | 1468 | Claude Opus 4.5 |
| LMArena WebDev: React | 1478 | Not measured | Only Claude Opus 4.5 measured |
| LMArena WebDev: HTML | 1510 | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 20 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Intelligence Index | 29.1 | 22.9 | Claude Opus 4.5 |
| Epoch Capabilities Index | 150.1 | 146.0 | Claude Opus 4.5 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 20.1 | Only Nemotron 3 Ultra measured |
| Design Arena: agents building web apps | 1159 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building full-stack apps | 1156 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building mobile apps | 1188 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building Android apps | 1176 | Not measured | Only Claude Opus 4.5 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 | 89.5% | 83.3% | Claude Opus 4.5 |
| APEX-Agents | Not measured | 22.7% | Only Nemotron 3 Ultra measured |
| METR time horizons | 75.0% | Not measured | Only Claude Opus 4.5 measured |
| Remote Labor Index | 3.8% | Not measured | Only Claude Opus 4.5 measured |
| GDPval | 45.5% | Not measured | Only Claude Opus 4.5 measured |
| BALROG | 43.5% | Not measured | Only Claude Opus 4.5 measured |
| DeepResearch Bench | 54.8% | Not measured | Only Claude Opus 4.5 measured |
| OSWorld | 66.3% | Not measured | Only Claude Opus 4.5 measured |
| Vending-Bench 2 | $4,967 | Not measured | Only Claude Opus 4.5 measured |
| Berkeley Function Calling Leaderboard (BFCL) | 77.5% | Not measured | Only Claude Opus 4.5 measured |
| MCP Atlas | 69.8% | 63.1% | Claude Opus 4.5 |
| Neither model has a result on the other 23 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index62
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| GPQA Diamond | 85.9% | 86.1% | Nemotron 3 Ultra |
| MMMU Pro (Vals AI) | 83.0% | Not measured | Only Claude Opus 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | 86.6% | 86.7% | Nemotron 3 Ultra |
| Humanity's Last Exam (Artificial Analysis run) | 30.1% | 28.4% | Claude Opus 4.5 |
| GPQA Diamond (Epoch AI run) | 86.0% | 85.4% | Claude Opus 4.5 |
| ARC-AGI | 80.0% | Not measured | Only Claude Opus 4.5 measured |
| ARC-AGI-2 | 37.6% | Not measured | Only Claude Opus 4.5 measured |
| SimpleBench | 62.0% | Not measured | Only Claude Opus 4.5 measured |
| Chess puzzles | 14.0% | Not measured | Only Claude Opus 4.5 measured |
| Mystery game puzzles | 22.0% | 20.0% | Claude Opus 4.5 |
| EBR-bench | 14.3% | Not measured | Only Claude Opus 4.5 measured |
| VPCT | 40.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: hard prompts | 1476 | 1452 | Claude Opus 4.5 |
| LMArena Text: expert | 1487 | 1472 | Claude Opus 4.5 |
| LMArena Text: hard prompts in English | 1482 | 1453 | Claude Opus 4.5 |
| Kagi LLM Benchmark | 80.2% | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 7 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index31
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AIME | 95.4% | Not measured | Only Claude Opus 4.5 measured |
| MGSM (Vals AI) | 95.2% | Not measured | Only Claude Opus 4.5 measured |
| AA Math Index | 91.3 | Not measured | Only Claude Opus 4.5 measured |
| AIME 2025 (Artificial Analysis run) | 91.3% | Not measured | Only Claude Opus 4.5 measured |
| OTIS Mock AIME | 86.1% | 86.7% | Nemotron 3 Ultra |
| FrontierMath, tiers 1 to 3 | 34.4% | Not measured | Only Claude Opus 4.5 measured |
| FrontierMath, tier 4 | 4.9% | Not measured | Only Claude Opus 4.5 measured |
| ProofBench | 36.0% | 2.0% | Claude Opus 4.5 |
| LMArena Text: math | 1463 | 1457 | Claude Opus 4.5 |
| LMArena Text: mathematical work | 1468 | 1461 | Claude Opus 4.5 |
| Neither model has a result on the other 4 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index63
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| MMLU Pro | 87.3% | 85.8% | Claude Opus 4.5 |
| LegalBench (Vals AI) | 84.6% | 82.1% | Claude Opus 4.5 |
| CaseLaw (Vals AI) | 62.6% | Not measured | Only Claude Opus 4.5 measured |
| CorpFin (Vals AI) | 65.1% | 65.5% | Nemotron 3 Ultra |
| TaxEval (Vals AI) | 74.9% | 73.1% | Claude Opus 4.5 |
| MortgageTax (Vals AI) | 68.7% | Not measured | Only Claude Opus 4.5 measured |
| MedQA (Vals AI) | 95.9% | Not measured | Only Claude Opus 4.5 measured |
| MedCode (Vals AI) | 49.2% | 38.6% | Claude Opus 4.5 |
| MMLU Pro (Artificial Analysis run) | 89.5% | Not measured | Only Claude Opus 4.5 measured |
| SimpleQA Verified | 45.7% | Not measured | Only Claude Opus 4.5 measured |
| GeoBench | 75.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: science | 1454 | 1465 | Nemotron 3 Ultra |
| LMArena Text: medicine and healthcare | 1444 | 1456 | Nemotron 3 Ultra |
| LMArena Text: legal and government | 1459 | 1452 | Claude Opus 4.5 |
| LMArena Text: business and finance | 1448 | 1434 | Claude Opus 4.5 |
| FACTS Benchmark Suite | 43.9% | Not measured | Only Claude Opus 4.5 measured |
| PRBench Finance | 46.2% | Not measured | Only Claude Opus 4.5 measured |
| PRBench Legal | 44.2% | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 2 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| Design Arena: websites | 1247 | 1145 | Claude Opus 4.5 |
| Design Arena: UI components | 1236 | 1135 | Claude Opus 4.5 |
| Design Arena: game dev | 1228 | 1138 | Claude Opus 4.5 |
| Design Arena: data viz | 1243 | 1141 | Claude Opus 4.5 |
| Design Arena: 3D | 1213 | 1131 | Claude Opus 4.5 |
| Design Arena: all code categories | 1241 | 1146 | Claude Opus 4.5 |
| Design Arena: SVG | 1180 | 1069 | Claude Opus 4.5 |
| Design Arena: ASCII art | 1190 | 1100 | Claude Opus 4.5 |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index146
| Benchmark | Claude Opus 4.5 | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 52.1% | Not measured | Only Claude Opus 4.5 measured |
| MedScribe (Vals AI) | 85.3% | Not measured | Only Claude Opus 4.5 measured |
| IFBench | 58.0% | 81.4% | Nemotron 3 Ultra |
| Long context reasoning (AA-LCR) | 77.3% | 79.3% | Nemotron 3 Ultra |
| DTBench | 89.9% | 90.1% | Nemotron 3 Ultra |
| LMCA | 44.5% | 36.9% | Claude Opus 4.5 |
| CL-bench | 21.1% | Not measured | Only Claude Opus 4.5 measured |
| Furniture assembly | 28.3% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text | 1451 | 1445 | Claude Opus 4.5 |
| LMArena Text: instruction following | 1478 | 1418 | Claude Opus 4.5 |
| LMArena Text: creative writing | 1445 | 1399 | Claude Opus 4.5 |
| LMArena Text: English | 1461 | 1455 | Claude Opus 4.5 |
| LMArena Text: non-English | 1438 | 1427 | Claude Opus 4.5 |
| LMArena Text: Chinese | 1470 | 1497 | Nemotron 3 Ultra |
| LMArena Text: German | 1449 | 1472 | Nemotron 3 Ultra |
| LMArena Text: Japanese | 1417 | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: Korean | 1424 | 1384 | Claude Opus 4.5 |
| LMArena Text: French | 1471 | 1472 | Nemotron 3 Ultra |
| LMArena Text: Spanish | 1457 | 1455 | Claude Opus 4.5 |
| LMArena Text: Russian | 1447 | 1417 | Claude Opus 4.5 |
| LMArena Text: Polish | 1439 | 1385 | Claude Opus 4.5 |
| LMArena Text: multi-turn | 1466 | 1411 | Claude Opus 4.5 |
| LMArena Text: longer queries | 1479 | 1437 | Claude Opus 4.5 |
| LMArena Text: writing and language | 1452 | 1406 | Claude Opus 4.5 |
| LMArena Text: entertainment and media | 1434 | 1397 | Claude Opus 4.5 |
| LMArena Document | 1462 | Not measured | Only Claude Opus 4.5 measured |
| MultiChallenge | 59.0% | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 21 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 4.5 | 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 4.5 | NVIDIA Nemotron 3 Ultra |
|---|---|---|
| Maker | Anthropic | NVIDIA |
| Weights | No public weights listed | Open weights |
| Released | November 24, 2025 | June 4, 2026 |
| Context window | 200K | 262K |
| Input $/Mtok | $5.00 | $0.60 |
| Output $/Mtok | $25.00 | $2.40 |
| Coding index | 44.0 | 30.0 |
| Independent measurements behind it | 3 | 3 |
| Cost per solved task | $1.37 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.5 better than Nemotron 3 Ultra for coding?
Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra. Pick Nemotron 3 Ultra for output tokens 10.4x cheaper ($2.40 vs $25.00 per million) and a larger context window (262K against 200K tokens).
Which is cheaper, Claude Opus 4.5 or Nemotron 3 Ultra?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for Claude Opus 4.5 only.
Which has the bigger context window, Claude Opus 4.5 or Nemotron 3 Ultra?
Nemotron 3 Ultra, with 262K tokens against 200K.
How many benchmarks is the Claude Opus 4.5 vs Nemotron 3 Ultra comparison based on?
60 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.