# Claude Mythos 5 vs Qwen3.8-27B

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

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

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Mythos 5 if you want the stronger benchmark profile. Qwen3.8-27B 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 82 to 55.26.
- The clearest category separation is in multimodal & grounded, where the averages are 86.2 for Claude Mythos 5 and 80.9 for Qwen3.8-27B.
- The biggest single benchmark swing is HLE in Knowledge, with scores of 64.5% and 30.8%.
- Qwen3.8-27B 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 | Qwen3.8-27B |
|----------|----------|----------|
| Creator | Anthropic | Alibaba |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 262K |
| Overall Score | null | 55.26 |
| Benchmarks Covered | 15 | 33 |
| Pricing (input/output) | $10.00 / $50.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

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

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.0% | 73.0% | Claude Mythos 5 |
| OSWorld-Verified | 85% | 84.3% | Claude Mythos 5 |
| BrowseComp | 88% | Coming soon | Coming soon |
| CyberGym | 83.8% | Coming soon | 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 |
| 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
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 48.7 (Supported · #45/142)

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | Coming soon | Coming soon |
| SWE-bench Pro | 80.3% | 61.7% | Claude Mythos 5 |
| Terminal-Bench 2.1 | 88.0% | 73.0% | Claude Mythos 5 |
| NL2Repo | Coming soon | 42.3% | Coming soon |
| DeepSWE | Coming soon | 42.2% | Coming soon |
| LiveCodeBench v6 | Coming soon | 90.3% | 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
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 78.7 (#8/27)

### Multimodal & Grounded

- Winner: Not comparable
- Claude Mythos 5 public-lane score: 86.2 (Unranked · 3 rankable rows)
- Qwen3.8-27B public-lane score: 80.9 (#11/50)

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Multimodal | 54.9% | Coming soon | Coming soon |
| CharXiv | 93.5% | 90.2% | Claude Mythos 5 |
| CharXiv w/o tools | 88.9% | 83.7% | Claude Mythos 5 |
| MathVision | Coming soon | 90.0% | 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 |
| 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
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 49.2 (Supported · #63/168)

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | 89.2% | Claude Mythos 5 |
| HLE | 64.5% | 30.8% | Claude Mythos 5 |
| HLE w/o tools | 59% | 30.8% | Claude Mythos 5 |
| GPQA-D | Coming soon | 89.2% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 88.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.3% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: 83.2 (#45/124)

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Qwen3.8-27B public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Qwen3.8-27B | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |

## FAQ

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

Claude Mythos 5 is ahead overall on BenchLM right now.

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

The widest category gap is in multimodal & grounded, where the averages are 86.2 for Claude Mythos 5 and 80.9 for Qwen3.8-27B.

### 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 Qwen3.8-27B cover on BenchLM?

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

## Related Comparisons

- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [Qwen3.8-27B vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-qwen3-8-27b)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Qwen3.8-27B vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-qwen3-8-27b)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [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)