# Qwen3.5-27B vs Spark-X2.6-4B

> Side-by-side benchmark comparison for Qwen3.5-27B and Spark-X2.6-4B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/qwen3-5-27b-vs-spark-x2-6-4b
- Last updated: October 20, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Qwen3.5-27B leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Qwen3.5-27B has the higher overall point estimate 48.65 to 40.14. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 70.2 for Qwen3.5-27B and 48.8 for Spark-X2.6-4B.
- The biggest single benchmark swing is GPQA in Knowledge, with scores of 85.5% and 69.9%.
- Spark-X2.6-4B also has the larger context window at 1M.

## Model Snapshot

| Property | Qwen3.5-27B | Spark-X2.6-4B |
|----------|----------|----------|
| Creator | Alibaba | SparkLLM |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | 48.65 | 40.14 |
| Benchmarks Covered | 20 | 20 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Qwen3.5-27B public-lane score: 37.2 (Estimated · #76/131)
- Spark-X2.6-4B public-lane score: 33 (Estimated · #89/131)

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 41.6% | Coming soon | Coming soon |
| BrowseComp | 61% | 53.1% | Qwen3.5-27B |
| OSWorld-Verified | 56.2% | Coming soon | Coming soon |
| Gert Labs | 39.41% | 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 |
| 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: Directional only
- Qwen3.5-27B public-lane score: 32.2 (Estimated · #87/152)
- Spark-X2.6-4B public-lane score: 30.6 (Estimated · #95/152)

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 72.4% | 62.8% | Qwen3.5-27B |
| LiveCodeBench v6 | 80.7% | Coming soon | Coming soon |
| SWE-Rebench | 58.9% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 41.6% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 54.3% | Coming soon |
| SWE Multilingual | Coming soon | 64.7% | Coming soon |
| SciCode | Coming soon | 36.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Qwen3.5-27B public-lane score: 70.2 (Unranked · 3 rankable rows)
- Spark-X2.6-4B public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 60.6% | 53.3% | Qwen3.5-27B |

### Multimodal & Grounded

- Winner: Not comparable
- Qwen3.5-27B public-lane score: 67.5 (#38/55)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMMU | 82.3% | Coming soon | Coming soon |
| MMVU | 73.3% | Coming soon | Coming soon |
| MMMU-Pro | 75% | Coming soon | Coming soon |
| CharXiv | 79.5% | Coming soon | Coming soon |
| MathVision | 86.0% | Coming soon | Coming soon |
| V* | 93.7% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- Qwen3.5-27B public-lane score: 45.9 (Supported · #97/187)
- Spark-X2.6-4B public-lane score: 43 (Estimated · #109/187)

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Pro | 86.1% | Coming soon | Coming soon |
| SuperGPQA | 65.6% | Coming soon | Coming soon |
| GPQA | 85.5% | 69.9% | Qwen3.5-27B |
| GPQA-D | Coming soon | 77.1% | Coming soon |
| HLE w/o tools | Coming soon | 17.9% | Coming soon |

### Multilingual

- Winner: Not comparable
- Qwen3.5-27B public-lane score: 87.1 (#10/17)
- Spark-X2.6-4B public-lane score: Coming soon

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 82.2% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Qwen3.5-27B public-lane score: 92.9 (#14/149)
- Spark-X2.6-4B public-lane score: 78.2 (#62/149)

| Benchmark | Qwen3.5-27B | Spark-X2.6-4B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 95% | 93.6% | Qwen3.5-27B |
| IFBench | Coming soon | 75.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Qwen3.5-27B public-lane score: Coming soon
- Spark-X2.6-4B public-lane score: 76.4 (Unranked · 3 rankable rows)

| Benchmark | Qwen3.5-27B | 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, Qwen3.5-27B or Spark-X2.6-4B?

Qwen3.5-27B has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Qwen3.5-27B and Spark-X2.6-4B?

The widest category gap is in reasoning, where the averages are 70.2 for Qwen3.5-27B and 48.8 for Spark-X2.6-4B.

### How many benchmarks does Qwen3.5-27B cover on BenchLM?

Qwen3.5-27B currently has 20 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

- [Qwen3.5-27B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-5-27b)
- [Spark-X2.6-4B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-spark-x2-6-4b)
- [Qwen3.5-27B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-qwen3-5-27b)
- [Spark-X2.6-4B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-spark-x2-6-4b)

## Explore More

- [Qwen3.5-27B profile](/models/qwen3-5-27b)
- [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)