# Claude Mythos 5 vs Claude Sonnet 5

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

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-claude-sonnet-5
- Last updated: September 29, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Mythos 5 if you want the stronger benchmark profile. Claude Sonnet 5 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 66.72.
- The clearest category separation is in multimodal & grounded, where the averages are 86.2 for Claude Mythos 5 and 78.4 for Claude Sonnet 5.
- The biggest single benchmark swing is SWE-bench Pro in Coding, with scores of 80.3% and 63.2%.
- Claude Sonnet 5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Mythos 5 | Claude Sonnet 5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 1M |
| Overall Score | null | 66.72 |
| Benchmarks Covered | 15 | 26 |
| Pricing (input/output) | $10.00 / $50.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 64.6 (Supported · #13/117)

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.0% | 80.4% | Claude Mythos 5 |
| OSWorld-Verified | 85% | 81.2% | Claude Mythos 5 |
| BrowseComp | 88% | 84.7% | Claude Mythos 5 |
| CyberGym | 83.8% | Coming soon | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 14.6% | Coming soon |
| HLE w/ tools | Coming soon | 57.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 74.5% | Coming soon |
| ApprenticeBench | Coming soon | 16% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 60 (Supported · #20/143)

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | 85.2% | Claude Mythos 5 |
| SWE-bench Pro | 80.3% | 63.2% | Claude Mythos 5 |
| Terminal-Bench 2.1 | 88.0% | 80.4% | Claude Mythos 5 |
| SWE Multilingual | Coming soon | 78.3% | Coming soon |
| SWE Multimodal | Coming soon | 28.1% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 42.7% | Coming soon |
| cursorBench32 | Coming soon | 61.5% | Coming soon |
| VulcanBench CII v1 | Coming soon | 89.2% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 82.4% | Coming soon |
| SWE-bench (Vals) | Coming soon | 79.6% | Coming soon |
| cursorBench40 | Coming soon | 34.1% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 78.7 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Not comparable
- Claude Mythos 5 public-lane score: 86.2 (Unranked · 3 rankable rows)
- Claude Sonnet 5 public-lane score: 78.4 (#15/50)

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Multimodal | 54.9% | Coming soon | Coming soon |
| CharXiv | 93.5% | 88.3% | Claude Mythos 5 |
| CharXiv w/o tools | 88.9% | 77% | Claude Mythos 5 |

### Knowledge

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 64.2 (Supported · #27/169)

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | Coming soon | Coming soon |
| HLE | 64.5% | 57.4% | Claude Mythos 5 |
| HLE w/o tools | 59% | 43.2% | Claude Mythos 5 |
| HLE-Verified | Coming soon | 31.0% | Coming soon |
| LABBench2 | Coming soon | 80.1% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 88.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 87.5% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Mythos 5 or Claude Sonnet 5?

Claude Mythos 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Mythos 5 and Claude Sonnet 5?

The widest category gap is in multimodal & grounded, where the averages are 86.2 for Claude Mythos 5 and 78.4 for Claude Sonnet 5.

### 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 Claude Sonnet 5 cover on BenchLM?

Claude Sonnet 5 currently has 26 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [Claude Sonnet 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-claude-sonnet-5)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Claude Sonnet 5 vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-claude-sonnet-5)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [Claude Sonnet 5 profile](/models/claude-sonnet-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)