# Qwen3.5 397B vs Qwen3.8-27B

> Side-by-side benchmark comparison for Qwen3.5 397B and Qwen3.8-27B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/qwen3-5-397b-vs-qwen3-8-27b
- Last updated: September 28, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Qwen3.8-27B if you want the stronger benchmark profile. Qwen3.5 397B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Qwen3.8-27B leads overall 55.26 to 51.
- The clearest category separation is in instruction following, where the averages are 0 for Qwen3.5 397B and 83.2 for Qwen3.8-27B.
- The biggest single benchmark swing is SWE-bench Pro in Coding, with scores of 50.9% and 61.7%.
- Qwen3.8-27B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Qwen3.8-27B also has the larger context window at 262K.

## Model Snapshot

| Property | Qwen3.5 397B | Qwen3.8-27B |
|----------|----------|----------|
| Creator | Alibaba | Alibaba |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 262K |
| Overall Score | null | 55.26 |
| Benchmarks Covered | 38 | 33 |
| Pricing (input/output) | $0.60 / $3.60 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Qwen3.5 397B public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 61.2 (Supported · #18/117)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 52.5% | Coming soon | Coming soon |
| BrowseComp | 62% | Coming soon | Coming soon |
| Claw-Eval | 56.8% | Coming soon | Coming soon |
| QwenClawBench | 51.8% | Coming soon | Coming soon |
| τ³-bench results | 68.4% | Coming soon | Coming soon |
| VITA-Bench | 43.7% | Coming soon | Coming soon |
| DeepPlanning | 37.6% | Coming soon | Coming soon |
| Toolathlon | 36.3% | Coming soon | Coming soon |
| MCP Atlas | 46.1% | Coming soon | Coming soon |
| MCP-Tasks | 74.2% | Coming soon | Coming soon |
| WideResearch | 74.0% | Coming soon | Coming soon |
| Gert Labs | 46.76% | Coming soon | Coming soon |
| ResearchClawBench | 14.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 73.0% | Coming soon |
| CoWorkBench | Coming soon | 70.7% | Coming soon |
| JobBench | Coming soon | 33.4% | Coming soon |
| Agents' Last Exam | Coming soon | 42.9% | Coming soon |
| OSWorld-Verified | Coming soon | 84.3% | Coming soon |
| WebArena-Verified | Coming soon | 64.8% | Coming soon |
| AndroidWorld | Coming soon | 81.9% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 58.4% | Coming soon |

### Coding

- Winner: Not comparable
- Qwen3.5 397B public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 48.7 (Supported · #45/142)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 76.2% | Coming soon | Coming soon |
| LiveCodeBench v6 | 83.6% | 90.3% | Qwen3.8-27B |
| SWE-bench Pro | 50.9% | 61.7% | Qwen3.8-27B |
| Terminal-Bench 2.1 | Coming soon | 73.0% | Coming soon |
| NL2Repo | Coming soon | 42.3% | Coming soon |
| DeepSWE | Coming soon | 42.2% | Coming soon |
| VulcanBench v3 | Coming soon | 82.6% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 84.0% | Coming soon |
| SWE-bench (Vals) | Coming soon | 86.0% | Coming soon |

### Reasoning

- Winner: Not comparable
- Qwen3.5 397B public-lane score: 61 (Unranked · 2 rankable rows)
- Qwen3.8-27B public-lane score: 78.7 (#8/27)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 63.2% | Coming soon | Coming soon |
| AI-Needle | 68.7% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Qwen3.5 397B public-lane score: 63.9 (#28/50)
- Qwen3.8-27B public-lane score: 80.9 (#11/50)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 79% | Coming soon | Coming soon |
| MathVision | 88.6% | 90.0% | Qwen3.8-27B |
| CharXiv | 80.8% | 90.2% | Qwen3.8-27B |
| VideoMMMU | 84.7% | Coming soon | Coming soon |
| ScreenSpot Pro | 65.6% | Coming soon | Coming soon |
| V* | 95.8% | Coming soon | Coming soon |
| MathVision w/ Python | Coming soon | 94.6% | Coming soon |
| BabyVision | Coming soon | 65.7% | Coming soon |
| BabyVision w/ Python | Coming soon | 85.6% | Coming soon |
| Vision2Web | Coming soon | 62.9% | Coming soon |
| CharXiv w/o tools | Coming soon | 83.7% | Coming soon |
| OmniDocBench 1.5 | Coming soon | 91.1% | Coming soon |
| RealWorldQA | Coming soon | 85.9% | Coming soon |
| ERQA | Coming soon | 65.5% | Coming soon |

### Knowledge

- Winner: Not comparable
- Qwen3.5 397B public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 49.2 (Supported · #63/168)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 88.4% | 89.2% | Qwen3.8-27B |
| SuperGPQA | 70.4% | Coming soon | Coming soon |
| MMLU-Pro | 87.8% | Coming soon | Coming soon |
| MMLU-Redux | 94.9% | Coming soon | Coming soon |
| C-Eval | 93% | Coming soon | Coming soon |
| HLE | 28.7% | 30.8% | Qwen3.8-27B |
| GPQA-D | Coming soon | 89.2% | Coming soon |
| HLE w/o tools | Coming soon | 30.8% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 88.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.3% | Coming soon |

### Multilingual

- Winner: Not comparable
- Qwen3.5 397B public-lane score: 69.7 (#5/12)
- Qwen3.8-27B public-lane score: Coming soon

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 84.7% | Coming soon | Coming soon |
| NOVA-63 | 59.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Qwen3.5 397B public-lane score: 0 (#124/124)
- Qwen3.8-27B public-lane score: 83.2 (#45/124)

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 92.6% | Coming soon | Coming soon |
| IFBench | Coming soon | 79.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- Qwen3.5 397B public-lane score: 73.5 (Unranked · 5 rankable rows)
- Qwen3.8-27B public-lane score: Coming soon

| Benchmark | Qwen3.5 397B | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2025 | 94.8% | Coming soon | Coming soon |
| HMMT Nov 2025 | 92.7% | Coming soon | Coming soon |
| HMMT Feb 2026 | 87.9% | Coming soon | Coming soon |
| MMAnswerBench | 80.9% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Qwen3.5 397B or Qwen3.8-27B?

Qwen3.8-27B is ahead overall on BenchLM right now.

### Where is the biggest gap between Qwen3.5 397B and Qwen3.8-27B?

The widest category gap is in instruction following, where the averages are 0 for Qwen3.5 397B and 83.2 for Qwen3.8-27B.

### How many benchmarks does Qwen3.5 397B cover on BenchLM?

Qwen3.5 397B currently has 38 sourced benchmark scores on BenchLM.

### How many benchmarks does Qwen3.8-27B cover on BenchLM?

Qwen3.8-27B currently has 33 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Qwen3.5 397B vs Qwen3.5 397B (Reasoning)](/compare/qwen3-5-397b-vs-qwen3-5-397b-reasoning)
- [Qwen3.8-27B vs Qwen3.5 397B (Reasoning)](/compare/qwen3-5-397b-reasoning-vs-qwen3-8-27b)
- [Qwen3.5 397B vs GPT-6 Astra](/compare/gpt-6-astra-vs-qwen3-5-397b)
- [Qwen3.8-27B vs GPT-6 Astra](/compare/gpt-6-astra-vs-qwen3-8-27b)

## Explore More

- [Qwen3.5 397B profile](/models/qwen3-5-397b)
- [Qwen3.8-27B profile](/models/qwen3-8-27b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)