# Claude Mythos 5 vs Claude Sonnet 4.5

> Side-by-side benchmark comparison for Claude Mythos 5 and Claude Sonnet 4.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Mythos 5 if you want the stronger benchmark profile. Claude Sonnet 4.5 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 85 to 53.74.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 88% and 50%.
- Claude Sonnet 4.5 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 | Claude Sonnet 4.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M+ | 200K |
| Overall Score | null | 53.74 |
| Benchmarks Covered | 15 | 11 |
| Pricing (input/output) | $10.00 / $50.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 44.6 (Estimated · #100/151)

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 88% | 50% | Claude Mythos 5 |
| OSWorld-Verified | 85% | 61.4% | Claude Mythos 5 |
| BrowseComp | 88% | Coming soon | Coming soon |
| CyberGym | 83.8% | Coming soon | Coming soon |
| VITA-Bench | Coming soon | 17.0% | Coming soon |
| Gert Labs | Coming soon | 48.51% | Coming soon |
| JobBench | Coming soon | 27.7% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 51 (Estimated · #67/183)

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | 77.2% | Claude Mythos 5 |
| SWE-bench Pro | 80.3% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 88.0% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Mythos 5 public-lane score: 85.1 (Unranked · 3 rankable rows)
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | 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 |

### Reasoning

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 19.1 (Unranked · 1 rankable row)

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 13.6% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 51.5 (Estimated · #81/181)

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | 83.4% | Claude Mythos 5 |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | Coming soon | Coming soon |

### Multilingual

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | 92.2% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Mythos 5 public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 34.8 (Unranked · 2 rankable rows)

| Benchmark | Claude Mythos 5 | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |
| AIME 2025 | Coming soon | 87% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 13.495% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 4.167% | Coming soon |

## FAQ

### Which is better overall, Claude Mythos 5 or Claude Sonnet 4.5?

Claude Mythos 5 is ahead overall on BenchLM right now.

### 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 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 11 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 4.5 vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-claude-sonnet-4-5)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Claude Sonnet 4.5 vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-claude-sonnet-4-5)

## Explore More

- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)