# Nemotron 3 Ultra vs o3

> Side-by-side benchmark comparison for Nemotron 3 Ultra and o3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/nemotron-3-ultra-vs-o3
- Last updated: October 15, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Nemotron 3 Ultra and o3.

## Summary

- Nemotron 3 Ultra and o3 do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Nemotron 3 Ultra | o3 |
|----------|----------|----------|
| Creator | NVIDIA | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 200K |
| Independent public score (not head-to-head) | 47.12 | 45.43 |
| Benchmarks Covered | 24 | 1 |
| Pricing (input/output) | $0.00 / $0.00 | $2.00 / $8.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 28 (Supported · #95/126)
- o3 public-lane score: Coming soon

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 56.4% | Coming soon | Coming soon |
| PinchBench | 90.0% | Coming soon | Coming soon |
| BrowseComp | 44.4% | Coming soon | Coming soon |
| τ³-bench results | 70.9% | Coming soon | Coming soon |
| HLE w/ tools | 37.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 50.9% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 21.9 (Supported · #115/149)
- o3 public-lane score: Coming soon

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 71.9% | Coming soon | Coming soon |
| SWE Multilingual | 67.7% | Coming soon | Coming soon |
| LiveCodeBench v6 | 89.0% | Coming soon | Coming soon |
| SciCode | 44.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 56.4% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 86.0% | Coming soon | Coming soon |
| SWE-bench (Vals) | 69.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 70.8 (#20/29)
- o3 public-lane score: 77.2 (Unranked · 2 rankable rows)

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 3.1% | Coming soon | Coming soon |
| LongBench v2 | 61.9% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: Coming soon
- o3 public-lane score: 67.8 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 50.3 (Estimated · #78/182)
- o3 public-lane score: 48.4 (Estimated · #87/182)

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | Coming soon | Coming soon |
| GPQA-D | 87.0% | Coming soon | Coming soon |
| HLE | 26.7% | Coming soon | Coming soon |
| HLE w/o tools | 26.7% | Coming soon | Coming soon |
| MMLU-Pro | 86.8% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 86.1% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 85.8% | Coming soon | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 89.2 (#7/17)
- o3 public-lane score: Coming soon

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 83% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: 92.1 (#20/146)
- o3 public-lane score: 87.4 (#37/146)

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 81.7% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Nemotron 3 Ultra public-lane score: Coming soon
- o3 public-lane score: 48.5 (Unranked · 1 rankable row)

| Benchmark | Nemotron 3 Ultra | o3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 33.333% | Coming soon |

## FAQ

### Can I compare Nemotron 3 Ultra and o3 on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Nemotron 3 Ultra vs o3-pro](/compare/nemotron-3-ultra-vs-o3-pro)
- [o3 vs o3-pro](/compare/o3-vs-o3-pro)
- [Nemotron 3 Ultra vs o3-mini](/compare/nemotron-3-ultra-vs-o3-mini)
- [o3 vs o3-mini](/compare/o3-vs-o3-mini)

## Explore More

- [Nemotron 3 Ultra profile](/models/nemotron-3-ultra)
- [o3 profile](/models/o3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)