# Nemotron 3 Ultra vs o3-pro

> Nemotron 3 Ultra is the stronger model overall, scoring 44.7 to 42.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/nemotron-3-ultra-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. Nemotron 3 Ultra scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.1 to 43.9.
- The biggest single-benchmark swing is WeirdML: 43.5% for Nemotron 3 Ultra and 58.2% for o3-pro.
- Nemotron 3 Ultra is cheaper at $0.60 / $2.40 per million input/output tokens, against $20 / $80 for o3-pro.
- Nemotron 3 Ultra accepts more context: 262K tokens versus 200K.
- Nemotron 3 Ultra has downloadable open weights; the other is API-only.

## Snapshot

| | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| Provider | NVIDIA | OpenAI |
| Noometry Index | 44.7 | 42.7 |
| Rank | 71 | 94 |
| Context | 262K | 200K |
| Input $/M | $0.60 | $20 |
| Output $/M | $2.40 | $80 |
| Weights | Open | Proprietary |

## Coding

- Nemotron 3 Ultra: 37.7 (#174)
- o3-pro: 55.1 (#22)

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| WeirdML | 43.5% | 58.2% |
| FrontierCode | 13.6% | — |
| Aider Polyglot | — | 84.9% |
| SciCode | 40.3% | — |
| LMArena Coding | 1468 | — |

## Reasoning

- Nemotron 3 Ultra: 30.3 (#78)
- o3-pro: 24.1 (#152)

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| DTBench | 90.1% | 86.9% |
| LMCA | 36.9% | 38.5% |
| Epoch Capabilities Index | 146.2 | 147.43 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| CritPt | 3.1% | — |
| Chess Puzzles | 12% | — |
| LMArena Hard Prompts | 1452 | — |
| Mystery Game Puzzles | 20% | — |

## Math

- Nemotron 3 Ultra: 34.4 (#160)
- o3-pro: —

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| ProofBench | 2% | — |
| LMArena Math | 1456 | — |

## Knowledge

- Nemotron 3 Ultra: 52.5 (#56)
- o3-pro: 29.0 (#234)

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| GPQA Diamond | 85.4% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1472 | — |

## Multilingual

- Nemotron 3 Ultra: 53.7 (#61)
- o3-pro: —

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| LMArena Non-English | 1427 | — |
| LMArena Chinese | 1498 | — |
| LMArena French | 1475 | — |
| LMArena German | 1471 | — |
| LMArena Korean | 1387 | — |
| LMArena Russian | 1415 | — |
| LMArena Spanish | 1452 | — |

## Instruction Following

- Nemotron 3 Ultra: 74.9 (#84)
- o3-pro: —

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1417 | — |

## Long Context

- Nemotron 3 Ultra: 43.9 (#77)
- o3-pro: 72.1 (#1)

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1437 | — |

## Writing & Preference

- Nemotron 3 Ultra: 66.3 (#35)
- o3-pro: 57.1 (#128)

| Benchmark | Nemotron 3 Ultra | o3-pro |
|---|---|---|
| LMArena Text | 1444 | — |
| LMArena Creative Writing | 1392 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1692 | — |
| LMArena Multi-Turn | 1412 | — |

## FAQ

### Is Nemotron 3 Ultra better than o3-pro?

Nemotron 3 Ultra is the stronger model overall, scoring 44.7 to 42.7 on the Noometry Index.

### Which is cheaper, Nemotron 3 Ultra or o3-pro?

Nemotron 3 Ultra is cheaper. It lists at $0.60 per million input tokens and $2.40 per million output tokens; o3-pro lists at $20 and $80.

### Is Nemotron 3 Ultra or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 37.7 in the Noometry coding category.

### Which has the bigger context window?

Nemotron 3 Ultra does, with 262K tokens against 200K.

### How many benchmarks do Nemotron 3 Ultra and o3-pro share?

4 benchmarks have published results for both models. Nemotron 3 Ultra has 29 scored results on Noometry and o3-pro has 12.