Compare / LFM3 1.7B vs Spark-X2.6 1.7B
LFM3 1.7B vs Spark-X2.6 1.7B
Updated November 2026
Verdict
LFM3 1.7B scores higher on the Small LM Index: 60.0 vs 50.1. On the 8 benchmarks both labs report, LFM3 1.7B wins 6 and Spark-X2.6 1.7B wins 2. Both need about 1.7 GB of memory at 4-bit quantization. Neither model has a hosted API on OpenRouter, so you would run both yourself.
Pick LFM3 1.7B if…
- you want the strongest model overall
- you need precise instruction following
- you build agents that call tools
- you want the more widely used model (more quantized builds and community support)
Pick Spark-X2.6 1.7B if…
- you work with long documents
- you need a permissive license (Apache-2.0)
Specifications
| LFM3 1.7B | Spark-X2.6 1.7B | |
|---|---|---|
| Small LM Index | 60.0 (likely 58–62) | 50.1 (likely 47–53) |
| Lab | Liquid AI · United States | SparkLLM (XHToken) · China |
| Released | 2026-10-27 | 2026-10-19 |
| Parameters | 1.7B (dense) | 1.7B (dense) |
| Memory at 4-bit | ~1.7 GB | ~1.7 GB |
| Context window | 262K tokens | 1M tokens |
| Input | text | text |
| Reasoning | Hybrid (thinking on/off) | Hybrid (thinking on/off) |
| License | LFM Open License | Apache-2.0 |
| API price / 1M tokens | Self-host only | Self-host only |
| Hugging Face downloads (30 days) | 47.8K | 2.7K |
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 | LFM3 1.7B | Spark-X2.6 1.7B |
|---|---|---|
| GPQA Diamond Knowledge | 63.4 | 56.1 |
| Humanity's Last Exam Reasoning | 7.2 | 8.7 |
| AIME Math | ≈ 84 | 70.1 |
| LiveCodeBench Coding | 73.5 | ≈ 57 |
| SWE-bench Verified Coding | 43.4 | 59.8 |
| Terminal-Bench Agentic | 12.9 | — |
| τ²-Bench Agentic | — | 85.3 |
| IFBench Instruction following | 73.0 | 65.5 |
| IFEval Instruction following | 96.7 | 89.4 |
| BFCL Agentic | 71.4 | 55.2 |
| HMMT Math | — | 48.8 |
| AA-LCR Long context | 52.8 | 48.0 |
| SciCode Coding | 28.5 | 20.1 |
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, LFM3 1.7B or Spark-X2.6 1.7B?
LFM3 1.7B scores higher on the Small LM Index: 60.0 vs 50.1. On the 8 benchmarks both labs report, LFM3 1.7B wins 6 and Spark-X2.6 1.7B wins 2.
Which is cheaper to run?
Neither model has a hosted API on OpenRouter, so you would run both yourself. Both need about 1.7 GB of memory at 4-bit quantization.
Which has the longer context window?
Spark-X2.6 1.7B has the longer context window: 1M tokens against 262K.
Can I use LFM3 1.7B and Spark-X2.6 1.7B commercially?
LFM3 1.7B is released under LFM Open License and Spark-X2.6 1.7B under Apache-2.0. Apache 2.0 and MIT allow commercial use; other licenses can add conditions, so read the license before shipping a product.