# Grok 4.3 vs Nemotron 3 Ultra

> Side-by-side benchmark comparison for Grok 4.3 and Nemotron 3 Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-3-vs-nemotron-3-ultra
- Last updated: September 10, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Grok 4.3 if you want the stronger benchmark profile. Nemotron 3 Ultra only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.3 leads overall 59.73 to 40.51.
- The clearest category separation is in reasoning, where the averages are 65.2 for Grok 4.3 and 48.7 for Nemotron 3 Ultra.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 41.9% and 50.9%.
- Nemotron 3 Ultra is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Grok 4.3 | Nemotron 3 Ultra |
|----------|----------|----------|
| Creator | xAI | NVIDIA |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 59.73 | 40.51 |
| Benchmarks Covered | 7 | 24 |
| Pricing (input/output) | $1.25 / $2.50 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Tie
- Grok 4.3 public-lane score: 26.9 (Supported · #144/152)
- Nemotron 3 Ultra public-lane score: 27 (Supported · #143/152)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 43.86% | Coming soon | Coming soon |
| ResearchClawBench | 12.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 41.9% | 50.9% | Nemotron 3 Ultra |
| Terminal-Bench 2.0 | Coming soon | 56.4% | Coming soon |
| 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 4.3
- Grok 4.3 public-lane score: 33.6 (Supported · #131/151)
- Nemotron 3 Ultra public-lane score: 26.6 (Supported · #145/151)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench (Vals) | 84.5% | 86.0% | Nemotron 3 Ultra |
| SWE-bench (Vals) | 71.4% | 69.0% | Grok 4.3 |
| SWE-bench Verified | Coming soon | 71.9% | Coming soon |
| SWE Multilingual | Coming soon | 67.7% | Coming soon |
| LiveCodeBench v6 | Coming soon | 89.0% | Coming soon |
| SciCode | Coming soon | 44.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 56.4% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Grok 4.3 public-lane score: 65.6 (#25/48)
- Nemotron 3 Ultra public-lane score: Coming soon

### Reasoning

- Winner: Coming soon
- Grok 4.3 public-lane score: 65.2 (Unranked · 2 rankable rows)
- Nemotron 3 Ultra public-lane score: 48.7 (Unranked · 1 rankable row)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 3.1% | Coming soon |
| LongBench v2 | Coming soon | 61.9% | Coming soon |

### Knowledge

- Winner: Coming soon
- Grok 4.3 public-lane score: 57 (Supported · #44/183)
- Nemotron 3 Ultra public-lane score: 44.7 (Estimated · #111/183)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 91.4% | 86.1% | Grok 4.3 |
| MMLU-Pro (Vals) | 85.8% | 85.8% | Tie |
| 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 |

### Instruction Following

- Winner: Coming soon
- Grok 4.3 public-lane score: 94.4 (#2/123)
- Nemotron 3 Ultra public-lane score: 88.8 (#28/123)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 81.7% | Coming soon |

### Multilingual

- Winner: Coming soon
- Grok 4.3 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 47.4 (#7/12)

| Benchmark | Grok 4.3 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | Coming soon | 83% | Coming soon |

## FAQ

### Which is better overall, Grok 4.3 or Nemotron 3 Ultra?

Grok 4.3 is ahead overall on BenchLM right now.

### Where is the biggest gap between Grok 4.3 and Nemotron 3 Ultra?

The widest category gap is in reasoning, where the averages are 65.2 for Grok 4.3 and 48.7 for Nemotron 3 Ultra.

### How many benchmarks does Grok 4.3 cover on BenchLM?

Grok 4.3 currently has 7 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 4.3 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-4-3)
- [Nemotron 3 Ultra vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-nemotron-3-ultra)
- [Grok 4.3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-3)
- [Nemotron 3 Ultra vs GPT-6 Astra](/compare/gpt-6-astra-vs-nemotron-3-ultra)

## Explore More

- [Grok 4.3 profile](/models/grok-4-3)
- [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)