# A.X K2 vs Nemotron 3 Ultra

> Side-by-side benchmark comparison for A.X K2 and Nemotron 3 Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-nemotron-3-ultra
- Last updated: September 10, 2026

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

## Quick Verdict

Pick A.X K2 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

- A.X K2 leads overall 49 to 40.51.
- The biggest single benchmark swing is IFBench in Instruction Following, with scores of 75.9% and 81.7%.
- Nemotron 3 Ultra also has the larger context window at 1M.

## Model Snapshot

| Property | A.X K2 | Nemotron 3 Ultra |
|----------|----------|----------|
| Creator | SK Telecom | NVIDIA |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | null | 40.51 |
| Benchmarks Covered | 10 | 24 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 27 (Supported · #143/152)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| 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 |
| Terminal-Bench 2.1 (Vals) | Coming soon | 50.9% | Coming soon |

### Coding

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 26.6 (Supported · #145/151)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | 89.0% | Nemotron 3 Ultra |
| SciCode | 41% | 44.6% | Nemotron 3 Ultra |
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 71.9% | Coming soon |
| SWE Multilingual | Coming soon | 67.7% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 56.4% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 86.0% | Coming soon |
| SWE-bench (Vals) | Coming soon | 69.0% | Coming soon |

### Reasoning

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 48.7 (Unranked · 1 rankable row)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 3.1% | Coming soon |
| LongBench v2 | Coming soon | 61.9% | Coming soon |

### Knowledge

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 44.7 (Estimated · #111/183)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | 26.7% | A.X K2 |
| GPQA-D | 85.6% | 87.0% | Nemotron 3 Ultra |
| GPQA | Coming soon | 87% | Coming soon |
| HLE w/o tools | Coming soon | 26.7% | Coming soon |
| MMLU-Pro | Coming soon | 86.8% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 86.1% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 85.8% | Coming soon |

### Instruction Following

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 88.8 (#28/123)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | 81.7% | Nemotron 3 Ultra |

### Multilingual

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: 47.4 (#7/12)

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | Coming soon | 83% | Coming soon |

### Mathematics

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Nemotron 3 Ultra public-lane score: Coming soon

| Benchmark | A.X K2 | Nemotron 3 Ultra | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, A.X K2 or Nemotron 3 Ultra?

A.X K2 is ahead overall on BenchLM right now.

### How many benchmarks does A.X K2 cover on BenchLM?

A.X K2 currently has 10 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

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Nemotron 3 Ultra vs A.X series](/compare/nemotron-3-ultra-vs-skt-ax)
- [A.X K2 vs Claude Fable 5.1](/compare/a-x-k2-vs-claude-fable-5-1)
- [Nemotron 3 Ultra vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-nemotron-3-ultra)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [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)