# Grok 4.5 vs Nemotron 3 Ultra

> Side-by-side benchmark comparison for Grok 4.5 and Nemotron 3 Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-5-vs-nemotron-3-ultra
- Last updated: October 7, 2026

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

## Quick Verdict

Grok 4.5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Grok 4.5 has the higher overall point estimate 63.97 to 46.68. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 57.7 for Grok 4.5 and 23.4 for Nemotron 3 Ultra.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 83.3% and 56.4%.
- Nemotron 3 Ultra is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Nemotron 3 Ultra also has the larger context window at 1M.

## Model Snapshot

| Property | Grok 4.5 | Nemotron 3 Ultra |
|----------|----------|----------|
| Creator | xAI | NVIDIA |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 500K | 1M |
| Overall Score | 63.97 | 46.68 |
| Benchmarks Covered | 17 | 24 |
| Pricing (input/output) | $2.00 / $6.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Grok 4.5
- Grok 4.5 public-lane score: 57.6 (Supported · #29/122)
- Nemotron 3 Ultra public-lane score: 26.9 (Supported · #93/122)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 15.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 83.3% | 56.4% | Grok 4.5 |
| deepSwe | 53% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 67.8% | 50.9% | Grok 4.5 |
| PinchBench | Coming soon | 90.0% | Coming soon |
| BrowseComp | Coming soon | 44.4% | Coming soon |
| τ³-bench results | Coming soon | 70.9% | Coming soon |
| HLE w/ tools | Coming soon | 37.4% | Coming soon |

### Coding

- Winner: Grok 4.5
- Grok 4.5 public-lane score: 57.7 (Supported · #27/146)
- Nemotron 3 Ultra public-lane score: 23.4 (Supported · #110/146)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 64.7% | Coming soon | Coming soon |
| SWE Multilingual | 78% | 67.7% | Grok 4.5 |
| Terminal-Bench 2.1 | 83.3% | 56.4% | Grok 4.5 |
| CursorBench 3.2 | 66.7% | Coming soon | Coming soon |
| VulcanBench v3 | 89.9% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.4% | 86.0% | Grok 4.5 |
| SWE-bench (Vals) | 86.6% | 69.0% | Grok 4.5 |
| PostTrainBench v1.1 | 23.4% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 71.9% | Coming soon |
| LiveCodeBench v6 | Coming soon | 89.0% | Coming soon |
| SciCode | Coming soon | 44.6% | Coming soon |

### Reasoning

- Winner: Directional only
- Grok 4.5 public-lane score: 50.4 (#28/28)
- Nemotron 3 Ultra public-lane score: 51.8 (#27/28)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.6% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.3% | Coming soon | Coming soon |
| ARC-AGI-1 | 85.67% | Coming soon | Coming soon |
| CritPt | Coming soon | 3.1% | Coming soon |
| LongBench v2 | Coming soon | 61.9% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Grok 4.5 public-lane score: 79.5 (Unranked · 1 rankable row)
- Nemotron 3 Ultra public-lane score: Coming soon

### Knowledge

- Winner: Directional only
- Grok 4.5 public-lane score: 67 (Supported · #19/174)
- Nemotron 3 Ultra public-lane score: 48.9 (Estimated · #72/174)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 92.9% | 86.1% | Grok 4.5 |
| MMLU-Pro (Vals) | 89.2% | 85.8% | Grok 4.5 |
| GPQA | Coming soon | 87% | Coming soon |
| GPQA-D | Coming soon | 87.0% | Coming soon |
| HLE | Coming soon | 26.7% | Coming soon |
| HLE w/o tools | Coming soon | 26.7% | Coming soon |
| MMLU-Pro | Coming soon | 86.8% | Coming soon |

### Multilingual

- Winner: Not comparable
- Grok 4.5 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 89.2 (#7/16)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | Coming soon | 83% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Grok 4.5 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 87.4 (#28/125)

| Benchmark | Grok 4.5 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 81.7% | Coming soon |

## FAQ

### Which is better overall, Grok 4.5 or Nemotron 3 Ultra?

Grok 4.5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Grok 4.5 and Nemotron 3 Ultra?

The widest category gap is in coding, where the averages are 57.7 for Grok 4.5 and 23.4 for Nemotron 3 Ultra.

### How many benchmarks does Grok 4.5 cover on BenchLM?

Grok 4.5 currently has 17 sourced benchmark scores on BenchLM.

### How many benchmarks does Nemotron 3 Ultra cover on BenchLM?

Nemotron 3 Ultra currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-5)
- [Nemotron 3 Ultra vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-nemotron-3-ultra)
- [Grok 4.5 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-5)
- [Nemotron 3 Ultra vs GPT-6 Astra](/compare/gpt-6-astra-vs-nemotron-3-ultra)

## Explore More

- [Grok 4.5 profile](/models/grok-4-5)
- [Nemotron 3 Ultra profile](/models/nemotron-3-ultra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)