# Nemotron 3 Ultra vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Nemotron 3 Ultra and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/nemotron-3-ultra-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 11
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Nemotron 3 Ultra leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Nemotron 3 Ultra has the higher overall point estimate 46.78 to 40.14. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 69.5 for Nemotron 3 Ultra and 48.8 for Spark-X2.6-4B.
- The biggest single benchmark swing is τ³-bench results in Agentic, with scores of 70.9% and 34.7%.

## Model Snapshot

| Property | Nemotron 3 Ultra | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | NVIDIA | SparkLLM |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 46.78 | 40.14 |
| Benchmarks Covered | 25 | 20 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Nemotron 3 Ultra public-lane score: 27.8 (Supported · #102/131)
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 56.4% | Coming soon | Coming soon |
| PinchBench | 90.0% | Coming soon | Coming soon |
| BrowseComp | 44.4% | 53.1% | Spark-X2.6-4B |
| τ³-bench results | 70.9% | 34.7% | Nemotron 3 Ultra |
| HLE w/ tools | 37.4% | 36.9% | Nemotron 3 Ultra |
| Terminal-Bench 2.1 (Vals) | 50.9% | Coming soon | Coming soon |
| MazeBench | 0% | Coming soon | Coming soon |
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| MCP Atlas | Coming soon | 62.4% | Coming soon |
| Claw-Eval | Coming soon | 69.9% | Coming soon |

### Coding

- Winner: Directional only
- Nemotron 3 Ultra public-lane score: 21.8 (Supported · #119/152)
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 71.9% | 62.8% | Nemotron 3 Ultra |
| SWE Multilingual | 67.7% | 64.7% | Nemotron 3 Ultra |
| LiveCodeBench v6 | 89.0% | Coming soon | Coming soon |
| SciCode | 44.6% | 36.8% | Nemotron 3 Ultra |
| 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 |
| SWE-bench Pro | Coming soon | 54.3% | Coming soon |

### Reasoning

- Winner: Not comparable
- Nemotron 3 Ultra public-lane score: 69.5 (Unranked · 1 rankable row)
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 3.1% | Coming soon | Coming soon |
| LongBench v2 | 61.9% | 53.3% | Nemotron 3 Ultra |

### Knowledge

- Winner: Directional only
- Nemotron 3 Ultra public-lane score: 50.2 (Estimated · #84/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | 69.9% | Nemotron 3 Ultra |
| GPQA-D | 87.0% | 77.1% | Nemotron 3 Ultra |
| HLE | 26.7% | Coming soon | Coming soon |
| HLE w/o tools | 26.7% | 17.9% | Nemotron 3 Ultra |
| 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: Not comparable
- Nemotron 3 Ultra public-lane score: 89.2 (#7/17)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 83% | Coming soon | Coming soon |

### Instruction Following

- Winner: Nemotron 3 Ultra
- Nemotron 3 Ultra public-lane score: 92.1 (#20/149)
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 81.7% | 75.8% | Nemotron 3 Ultra |
| IFEval | Coming soon | 93.6% | Coming soon |

### Mathematics

- Winner: Not comparable
- Nemotron 3 Ultra public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | Nemotron 3 Ultra | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | Coming soon | 91.2% | Coming soon |
| HMMT Feb 2026 | Coming soon | 81.3% | Coming soon |
| IMOAnswerBench | Coming soon | 75.2% | Coming soon |

## FAQ

### Which is better overall, Nemotron 3 Ultra or Spark-X2.6-4B?

Nemotron 3 Ultra has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Nemotron 3 Ultra and Spark-X2.6-4B?

The widest category gap is in reasoning, where the averages are 69.5 for Nemotron 3 Ultra and 48.8 for Spark-X2.6-4B.

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

Nemotron 3 Ultra currently has 25 sourced benchmark scores on BenchLM.

### How many benchmarks does Spark-X2.6-4B cover on BenchLM?

Spark-X2.6-4B currently has 20 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Nemotron 3 Ultra vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-nemotron-3-ultra)
- [Spark-X2.6-4B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-spark-x2-6-4b)
- [Nemotron 3 Ultra vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-nemotron-3-ultra)
- [Spark-X2.6-4B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-spark-x2-6-4b)

## Explore More

- [Nemotron 3 Ultra profile](/models/nemotron-3-ultra)
- [Spark-X2.6-4B profile](/models/spark-x2-6-4b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)