# LongCat-Flash-Lite-Sparse vs Spark-X2.6-4B

> Side-by-side benchmark comparison for LongCat-Flash-Lite-Sparse and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/longcat-flash-lite-sparse-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Spark-X2.6-4B leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Spark-X2.6-4B has the higher overall point estimate 40.14 to 0. Conditional score ranges do not establish rank confidence.
- The biggest single benchmark swing is HMMT Feb 2026 in Mathematics, with scores of 40.5% and 81.3%.

## Model Snapshot

| Property | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Meituan | SparkLLM |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | null | 40.14 |
| Benchmarks Covered | 17 | 20 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 33.7% | Coming soon | Coming soon |
| VITA-Bench | 21.7% | Coming soon | Coming soon |
| MCP Atlas | 45.6% | 62.4% | Spark-X2.6-4B |
| BrowseComp | 48.6% | 53.1% | Spark-X2.6-4B |
| BFCL v4 | Coming soon | 71.8% | Coming soon |
| τ²-bench results | Coming soon | 86.9% | Coming soon |
| HLE w/ tools | Coming soon | 36.9% | Coming soon |
| τ³-bench results | Coming soon | 34.7% | Coming soon |
| Claw-Eval | Coming soon | 69.9% | Coming soon |

### Coding

- Winner: Not comparable
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 68.2% | 62.8% | LongCat-Flash-Lite-Sparse |
| SWE-bench Pro | 40.6% | 54.3% | Spark-X2.6-4B |
| SWE Multilingual | 59.3% | 64.7% | Spark-X2.6-4B |
| Terminal-Bench 2.0 | 33.7% | Coming soon | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 53.3% | Coming soon |

### Knowledge

- Winner: Not comparable
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU | 85.3% | Coming soon | Coming soon |
| MMLU-Pro | 79.2% | Coming soon | Coming soon |
| CMMLU | 84.3% | Coming soon | Coming soon |
| C-Eval | 85.8% | Coming soon | Coming soon |
| GPQA-D | 69.5% | 77.1% | Spark-X2.6-4B |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |
| GPQA | Coming soon | 69.9% | Coming soon |

### Instruction Following

- Winner: Not comparable
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 93.6% | Coming soon |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

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

| Benchmark | LongCat-Flash-Lite-Sparse | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MATH-500 | 95.8% | Coming soon | Coming soon |
| AIME26 | 65.7% | 91.2% | Spark-X2.6-4B |
| HMMT Feb 2026 | 40.5% | 81.3% | Spark-X2.6-4B |
| IMOAnswerBench | 49.4% | 75.2% | Spark-X2.6-4B |

## FAQ

### Which is better overall, LongCat-Flash-Lite-Sparse or Spark-X2.6-4B?

Spark-X2.6-4B has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### How many benchmarks does LongCat-Flash-Lite-Sparse cover on BenchLM?

LongCat-Flash-Lite-Sparse currently has 17 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

- [LongCat-Flash-Lite-Sparse vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-longcat-flash-lite-sparse)
- [Spark-X2.6-4B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-spark-x2-6-4b)
- [LongCat-Flash-Lite-Sparse vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-longcat-flash-lite-sparse)
- [Spark-X2.6-4B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-spark-x2-6-4b)

## Explore More

- [LongCat-Flash-Lite-Sparse profile](/models/longcat-flash-lite-sparse)
- [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)