Nemotron 3 Ultra vs o3
Nemotron 3 Ultra leads o3 on the Artificial Analysis Intelligence Index, 22.9 to 20.2, and Nemotron 3 Ultra costs 3.3x less per output token ($2.40 vs $8.00 per million). Updated October 22, 2026; 53 benchmarks have a result for both.
Nemotron 3 Ultra or o3: which to pick
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding.
Pick o3 for work measured by Terminal-Bench Hard (Artificial Analysis run) or WeirdML, where it leads.
- Shared results
- 53
- Nemotron 3 Ultra only
- 18
- o3 only
- 53
- 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
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 20.2.
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 84.1%.
Same board, both measured
Math
AIME
No call
Only o3 has a AIME result, 85.3%.
Directional only
Knowledge
MMLU Pro
Nemotron 3 Ultra
Nemotron 3 Ultra leads, 85.8% against 85.6%.
Same board, both measured
Web design
Design Arena: websites
Nemotron 3 Ultra
Nemotron 3 Ultra leads, 1145 against 1036.
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
Nemotron 3 Ultra $0.0018, o3 $0.0060 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only o3 has the number, $0.571.
Directional only
At a glance
- Coding index
- Nemotron 3 Ultra 30.0 from 3 benchmarks, o3 not benchmarked.
- Widest category
- Web design, 13.0 points apart on average over 5 shared benchmarks.
- Widest single gap
- Design Arena: all code categories: Nemotron 3 Ultra 1146 against o3 1020, 15.8 points apart on a 0 to 100 scale.
- Output price
- Nemotron 3 Ultra $2.40 against o3 $8.00 per million output tokens, 3.3x apart.
- Context window
- Nemotron 3 Ultra takes 262K tokens, o3 200K.
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 | Nemotron 3 Ultra | Bars | o3 | Ties |
|---|---|---|---|---|
| Coding | 3 | 2 | ||
| Intelligence | 1 | 1 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 7 | 1 | ||
| Math | 3 | 0 | ||
| Knowledge | 6 | 3 | ||
| Web design | 4 | 1 | ||
| General | 18 | 2 | ||
| All shared boards | 43 | 10 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index32
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 81.3% | Only o3 measured |
| SWE-bench Verified | Not measured | 58.4% | Only o3 measured |
| SWE-bench Multimodal | Not measured | 36.0% | Only o3 measured |
| AA Coding Index | 49.3 | Not measured | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Vals AI) | 86.0% | 83.9% | Nemotron 3 Ultra |
| SWE-bench Verified (Vals AI) | 69.0% | Not measured | Only Nemotron 3 Ultra measured |
| Vibe Code Bench (Vals AI) | 7.6% | Not measured | Only Nemotron 3 Ultra measured |
| Code migration (Vals AI) | 4.9% | Not measured | Only Nemotron 3 Ultra measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Nemotron 3 Ultra measured |
| Terminal-Bench 2.1 (Vals AI) | 50.9% | Not measured | Only Nemotron 3 Ultra measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 80.8% | Only o3 measured |
| SciCode | 40.3% | Not measured | Only Nemotron 3 Ultra measured |
| Terminal-Bench Hard (Artificial Analysis run) | 36.4% | 37.1% | o3 |
| FrontierCode | 13.6% | Not measured | Only Nemotron 3 Ultra measured |
| GSO-Bench | Not measured | 8.8% | Only o3 measured |
| WeirdML | 43.5% | 52.4% | o3 |
| ALE-Bench | Not measured | 933.5 | Only o3 measured |
| LMArena Text: coding | 1468 | 1407 | Nemotron 3 Ultra |
| LMArena Text: software and IT | 1468 | 1415 | Nemotron 3 Ultra |
| SciCode | Not measured | 9.2% | Only o3 measured |
| Neither model has a result on the other 23 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.9 | 20.2 | Nemotron 3 Ultra |
| Epoch Capabilities Index | 146.0 | 146.7 | o3 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| AA Agentic Index | 20.1 | Not measured | Only Nemotron 3 Ultra measured |
| Finance Agent (Vals AI) | 37.7% | Not measured | Only Nemotron 3 Ultra measured |
| Legal Research Bench (Vals AI) | 15.4% | Not measured | Only Nemotron 3 Ultra measured |
| Excel Modeling Benchmark (Vals AI) | 31.7% | Not measured | Only Nemotron 3 Ultra measured |
| τ²-Bench Telecom | 83.3% | 80.7% | Nemotron 3 Ultra |
| APEX-Agents | 22.7% | Not measured | Only Nemotron 3 Ultra measured |
| METR time horizons | Not measured | 65.4% | Only o3 measured |
| GDPval | Not measured | 30.8% | Only o3 measured |
| DeepResearch Bench | Not measured | 45.2% | Only o3 measured |
| OSWorld | Not measured | 23.0% | Only o3 measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 63.0% | Only o3 measured |
| BrowseComp-Plus | Not measured | 65.9% | Only o3 measured |
| MCP Atlas | 63.1% | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 29 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index71
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| GPQA Diamond | 86.1% | 84.1% | Nemotron 3 Ultra |
| MMMU Pro (Vals AI) | Not measured | 80.4% | Only o3 measured |
| GPQA Diamond (Artificial Analysis run) | 86.7% | 82.7% | Nemotron 3 Ultra |
| Humanity's Last Exam (Artificial Analysis run) | 28.4% | 20.1% | Nemotron 3 Ultra |
| GPQA Diamond (Epoch AI run) | 85.4% | 81.8% | Nemotron 3 Ultra |
| ARC-AGI | Not measured | 60.8% | Only o3 measured |
| ARC-AGI-2 | Not measured | 6.5% | Only o3 measured |
| SimpleBench | Not measured | 53.1% | Only o3 measured |
| Chess puzzles | Not measured | 37.0% | Only o3 measured |
| Mystery game puzzles | 20.0% | 29.0% | o3 |
| VPCT | Not measured | 52.0% | Only o3 measured |
| LMArena Text: hard prompts | 1452 | 1402 | Nemotron 3 Ultra |
| LMArena Text: expert | 1472 | 1402 | Nemotron 3 Ultra |
| LMArena Text: hard prompts in English | 1453 | 1411 | Nemotron 3 Ultra |
| LMArena Vision: diagrams | Not measured | 1220 | Only o3 measured |
| LMArena Vision: homework | Not measured | 1234 | Only o3 measured |
| Kagi LLM Benchmark | Not measured | 67.6% | Only o3 measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| AIME | Not measured | 85.3% | Only o3 measured |
| MATH 500 (Vals AI) | Not measured | 94.6% | Only o3 measured |
| MGSM (Vals AI) | Not measured | 91.8% | Only o3 measured |
| AA Math Index | Not measured | 88.3 | Only o3 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 88.3% | Only o3 measured |
| OTIS Mock AIME | 86.7% | 84.4% | Nemotron 3 Ultra |
| FrontierMath, tiers 1 to 3 | Not measured | 33.3% | Only o3 measured |
| ProofBench | 2.0% | Not measured | Only Nemotron 3 Ultra measured |
| MATH level 5 | Not measured | 97.8% | Only o3 measured |
| LMArena Text: math | 1457 | 1426 | Nemotron 3 Ultra |
| LMArena Text: mathematical work | 1461 | 1423 | Nemotron 3 Ultra |
| MathArena | Not measured | 14.2% | Only o3 measured |
| Neither model has a result on the other 2 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index63
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| MMLU Pro | 85.8% | 85.6% | Nemotron 3 Ultra |
| LegalBench (Vals AI) | 82.1% | 83.8% | o3 |
| CorpFin (Vals AI) | 65.5% | 59.7% | Nemotron 3 Ultra |
| TaxEval (Vals AI) | 73.1% | 74.6% | o3 |
| MortgageTax (Vals AI) | Not measured | 65.7% | Only o3 measured |
| MedQA (Vals AI) | Not measured | 96.1% | Only o3 measured |
| MedCode (Vals AI) | 38.6% | 47.3% | o3 |
| MMLU Pro (Artificial Analysis run) | Not measured | 85.3% | Only o3 measured |
| SimpleQA Verified | Not measured | 49.4% | Only o3 measured |
| GeoBench | Not measured | 74.0% | Only o3 measured |
| LMArena Text: science | 1465 | 1429 | Nemotron 3 Ultra |
| LMArena Text: medicine and healthcare | 1456 | 1448 | Nemotron 3 Ultra |
| LMArena Text: legal and government | 1452 | 1428 | Nemotron 3 Ultra |
| LMArena Text: business and finance | 1434 | 1393 | Nemotron 3 Ultra |
| FACTS Benchmark Suite | Not measured | 44.4% | Only o3 measured |
| PRBench Finance | Not measured | 47.7% | Only o3 measured |
| PRBench Legal | Not measured | 48.6% | Only o3 measured |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index41
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1145 | 1036 | Nemotron 3 Ultra |
| Design Arena: UI components | 1135 | 1014 | Nemotron 3 Ultra |
| Design Arena: game dev | 1138 | 1034 | Nemotron 3 Ultra |
| Design Arena: data viz | 1141 | 1200 | o3 |
| Design Arena: 3D | 1131 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: all code categories | 1146 | 1020 | Nemotron 3 Ultra |
| Design Arena: SVG | 1069 | Not measured | Only Nemotron 3 Ultra measured |
| Design Arena: ASCII art | 1100 | Not measured | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index182
| Benchmark | Nemotron 3 Ultra | o3 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | Not measured | 41.8% | Only o3 measured |
| MedScribe (Vals AI) | Not measured | 76.7% | Only o3 measured |
| IFBench | 81.4% | 71.4% | Nemotron 3 Ultra |
| Long context reasoning (AA-LCR) | 79.3% | 74.7% | Nemotron 3 Ultra |
| DTBench | 90.1% | 84.8% | Nemotron 3 Ultra |
| LMCA | 36.9% | 39.7% | o3 |
| Fiction.LiveBench | Not measured | 88.9% | Only o3 measured |
| Creative writing (Lech Mazur) | Not measured | 83.9% | Only o3 measured |
| CL-bench | Not measured | 17.8% | Only o3 measured |
| LMArena Text | 1445 | 1410 | Nemotron 3 Ultra |
| LMArena Text: instruction following | 1418 | 1368 | Nemotron 3 Ultra |
| LMArena Text: creative writing | 1399 | 1359 | Nemotron 3 Ultra |
| LMArena Vision | Not measured | 1214 | Only o3 measured |
| LMArena Text: English | 1455 | 1417 | Nemotron 3 Ultra |
| LMArena Text: non-English | 1427 | 1401 | Nemotron 3 Ultra |
| LMArena Text: Chinese | 1497 | 1437 | Nemotron 3 Ultra |
| LMArena Text: German | 1472 | 1420 | Nemotron 3 Ultra |
| LMArena Text: Japanese | Not measured | 1403 | Only o3 measured |
| LMArena Text: Korean | 1384 | 1370 | Nemotron 3 Ultra |
| LMArena Text: French | 1472 | 1430 | Nemotron 3 Ultra |
| LMArena Text: Spanish | 1455 | 1395 | Nemotron 3 Ultra |
| LMArena Text: Russian | 1417 | 1406 | Nemotron 3 Ultra |
| LMArena Text: Polish | 1385 | 1438 | o3 |
| LMArena Text: multi-turn | 1411 | 1405 | Nemotron 3 Ultra |
| LMArena Text: longer queries | 1437 | 1372 | Nemotron 3 Ultra |
| LMArena Text: writing and language | 1406 | 1372 | Nemotron 3 Ultra |
| LMArena Text: entertainment and media | 1397 | 1373 | Nemotron 3 Ultra |
| LMArena Vision: English | Not measured | 1221 | Only o3 measured |
| LMArena Vision: Chinese | Not measured | 1237 | Only o3 measured |
| LMArena Vision: reading text | Not measured | 1218 | Only o3 measured |
| LMArena Vision: humor | Not measured | 1222 | Only o3 measured |
| LMArena Vision: captioning | Not measured | 1210 | Only o3 measured |
| LMArena Vision: recognizing things | Not measured | 1234 | Only o3 measured |
| LMArena Vision: creative writing | Not measured | 1201 | Only o3 measured |
| MultiChallenge | Not measured | 56.6% | Only o3 measured |
| Neither model has a result on the other 13 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Nemotron 3 Ultra | o3 | 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 | NVIDIA Nemotron 3 Ultra | OpenAI o3 |
|---|---|---|
| Maker | NVIDIA | OpenAI |
| Weights | Open weights | No public weights listed |
| Released | June 4, 2026 | April 16, 2025 |
| Context window | 262K | 200K |
| Input $/Mtok | $0.60 | $2.00 |
| Output $/Mtok | $2.40 | $8.00 |
| Coding index | 30.0 | Not benchmarked |
| Independent measurements behind it | 3 | 0 |
| Cost per solved task | Not computable | $0.571 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Nemotron 3 Ultra better than o3 for coding?
Only Nemotron 3 Ultra has a coding score, 30.0 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding. Pick o3 for work measured by Terminal-Bench Hard (Artificial Analysis run) or WeirdML, where it leads.
Which is cheaper, Nemotron 3 Ultra or o3?
Nemotron 3 Ultra costs $0.60 per million input tokens and $2.40 per million output tokens; o3 costs $2.00 and $8.00. Cost per solved task is known for o3 only.
Which has the bigger context window, Nemotron 3 Ultra or o3?
Nemotron 3 Ultra, with 262K tokens against 200K.
How many benchmarks is the Nemotron 3 Ultra vs o3 comparison based on?
53 benchmarks have a result for both models as of October 22, 2026. Nemotron 3 Ultra's coding index rests on 3 independent benchmarks and o3's on 0. Where only one model has a result, the page says so instead of naming a winner.