# Claude Mythos 5 vs Qwen3.5-27B

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

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-qwen3-5-27b
- Last updated: September 4, 2026

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

## Quick Verdict

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

## Summary

- Claude Mythos 5 leads overall 85 to 58.31.
- The clearest category separation is in multimodal & grounded, where the averages are 85.1 for Claude Mythos 5 and 70.5 for Qwen3.5-27B.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 88% and 41.6%.
- Qwen3.5-27B is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Mythos 5 also has the larger context window at 1M+.

## Model Snapshot

| Property | Claude Mythos 5 | Qwen3.5-27B |
|----------|----------|----------|
| Creator | Anthropic | Alibaba |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 262K |
| Overall Score | null | 58.31 |
| Benchmarks Covered | 15 | 16 |
| Pricing (input/output) | $10.00 / $50.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 48.5 (Estimated · #75/151)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 88% | 41.6% | Claude Mythos 5 |
| OSWorld-Verified | 85% | 56.2% | Claude Mythos 5 |
| BrowseComp | 88% | 61% | Claude Mythos 5 |
| CyberGym | 83.8% | Coming soon | Coming soon |
| Gert Labs | Coming soon | 39.41% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 40.7 (Supported · #139/183)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | 72.4% | Claude Mythos 5 |
| SWE-bench Pro | 80.3% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 88.0% | Coming soon | Coming soon |
| SWE-Rebench | Coming soon | 58.9% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Mythos 5 public-lane score: 85.1 (Unranked · 3 rankable rows)
- Qwen3.5-27B public-lane score: 70.5 (Unranked · 3 rankable rows)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Multimodal | 54.9% | Coming soon | Coming soon |
| CharXiv | 93.5% | Coming soon | Coming soon |
| CharXiv w/o tools | 88.9% | Coming soon | Coming soon |
| MMMU | Coming soon | 82.3% | Coming soon |
| MMVU | Coming soon | 73.3% | Coming soon |
| MathVision | Coming soon | 86.0% | Coming soon |
| V* | Coming soon | 93.7% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 50.9 (Unranked · 3 rankable rows)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 60.6% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 48.5 (Supported · #100/181)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | 85.5% | Claude Mythos 5 |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 86.1% | Coming soon |
| SuperGPQA | Coming soon | 65.6% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 92.6 (#13/120)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | Coming soon | 95% | Coming soon |

### Multilingual

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: 36.8 (#9/12)

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |
| MMLU-ProX | Coming soon | 82.2% | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.5-27B public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Qwen3.5-27B | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Mythos 5 or Qwen3.5-27B?

Claude Mythos 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Mythos 5 and Qwen3.5-27B?

The widest category gap is in multimodal & grounded, where the averages are 85.1 for Claude Mythos 5 and 70.5 for Qwen3.5-27B.

### How many benchmarks does Claude Mythos 5 cover on BenchLM?

Claude Mythos 5 currently has 15 sourced benchmark scores on BenchLM.

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

Qwen3.5-27B currently has 16 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [Qwen3.5-27B vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-qwen3-5-27b)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Qwen3.5-27B vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-qwen3-5-27b)

## Explore More

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