Compare / Spark-X2.5 4B vs Nemotron Labs Dory 1.0 4B
Spark-X2.5 4B vs Nemotron Labs Dory 1.0 4B
Updated November 2026
Verdict
Spark-X2.5 4B scores higher on the Small LM Index: 65.5 vs 60.0. On the 5 benchmarks both labs report, Spark-X2.5 4B wins 3 and Nemotron Labs Dory 1.0 4B wins 2. Both need about 3.4 GB of memory at 4-bit quantization. Neither model has a hosted API on OpenRouter, so you would run both yourself.
Pick Spark-X2.5 4B if…
- you want the strongest model overall
- you need precise instruction following
- you work with long documents
- you need a permissive license (Apache-2.0)
Pick Nemotron Labs Dory 1.0 4B if…
- you mostly write code
Specifications
| Spark-X2.5 4B | Nemotron Labs Dory 1.0 4B | |
|---|---|---|
| Small LM Index | 65.5 (likely 63–68) | 60.0 (likely 58–62) |
| Lab | SparkLLM (XHToken) · China | NVIDIA · United States |
| Released | 2026-08-24 | 2026-10-16 |
| Parameters | 4.1B (dense) | 4B (dense) |
| Memory at 4-bit | ~3.4 GB | ~3.4 GB |
| Context window | 1M tokens | 262K tokens |
| Input | text | text |
| Reasoning | Hybrid (thinking on/off) | Always thinks |
| License | Apache-2.0 | OpenMDW-1.1 |
| API price / 1M tokens | Self-host only | Self-host only |
| Hugging Face downloads (30 days) | 30.3K | 10.5K |
Benchmarks
Higher is better. Bold marks the winner where both labs report a score. ≈ marks the index model's estimate for a score that wasn't reported, ✓ an independent measurement and * a score measured by another lab.
| Benchmark | Spark-X2.5 4B | Nemotron Labs Dory 1.0 4B |
|---|---|---|
| GPQA Diamond Knowledge | 73.7 | 69.2 |
| Humanity's Last Exam Reasoning | 12.3 | 8.3 |
| AIME Math | 90.7 | ≈ 84 |
| SWE-bench Verified Coding | 41.6 | 50.3 |
| Terminal-Bench Agentic | — | 12.5 |
| τ²-Bench Agentic | 75.1 | — |
| IFBench Instruction following | 75.0 | 74.3 |
| IFEval Instruction following | 93.0 | — |
| BFCL Agentic | 65.1 | — |
| HMMT Math | 81.2 | — |
| AA-LCR Long context | 56.3 | 63.0 |
| SciCode Coding | 34.7 | — |
Scores are mostly reported by each lab with its own settings, so small gaps are noise. See the methodology. Open in the interactive comparison to add more models.
Questions
Which is better, Spark-X2.5 4B or Nemotron Labs Dory 1.0 4B?
Spark-X2.5 4B scores higher on the Small LM Index: 65.5 vs 60.0. On the 5 benchmarks both labs report, Spark-X2.5 4B wins 3 and Nemotron Labs Dory 1.0 4B wins 2.
Which is cheaper to run?
Neither model has a hosted API on OpenRouter, so you would run both yourself. Both need about 3.4 GB of memory at 4-bit quantization.
Which has the longer context window?
Spark-X2.5 4B has the longer context window: 1M tokens against 262K.
Can I use Spark-X2.5 4B and Nemotron Labs Dory 1.0 4B commercially?
Spark-X2.5 4B is released under Apache-2.0 and Nemotron Labs Dory 1.0 4B under OpenMDW-1.1. Apache 2.0 and MIT allow commercial use; other licenses can add conditions, so read the license before shipping a product.