# Claude Mythos 5 vs Beam

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

- Canonical page: https://benchlm.ai/compare/claude-mythos-5-vs-reflection-beam
- Last updated: October 5, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Mythos 5 if you want the stronger benchmark profile. Beam 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 84 to 0.
- The biggest single benchmark swing is HLE w/o tools in Knowledge, with scores of 59% and 36.2%.
- Beam 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 | Beam |
|----------|----------|----------|
| Creator | Anthropic | Reflection AI |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | null |
| Overall Score | null | null |
| Benchmarks Covered | 15 | 16 |
| Pricing (input/output) | $10.00 / $50.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.0% | 80.1% | Claude Mythos 5 |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| BrowseComp | 88% | 77.4% | Claude Mythos 5 |
| CyberGym | 83.8% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 78.7% | Coming soon |
| DeepSearchQA | Coming soon | 80.1% | Coming soon |

### Coding

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95.5% | 80.9% | Claude Mythos 5 |
| SWE-bench Pro | 80.3% | 65.5% | Claude Mythos 5 |
| Terminal-Bench 2.1 | 88.0% | 80.1% | Claude Mythos 5 |
| DeepSWE | Coming soon | 44.4% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 34.6% | Coming soon |
| SWE Multilingual | Coming soon | 78% | Coming soon |
| SciCode | Coming soon | 49.7% | Coming soon |

### Reasoning

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | Coming soon | 65.5% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Mythos 5 public-lane score: 86.2 (Unranked · 3 rankable rows)
- Beam public-lane score: Coming soon

| Benchmark | Claude Mythos 5 | Beam | 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 |

### Knowledge

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.1% | Coming soon | Coming soon |
| HLE | 64.5% | Coming soon | Coming soon |
| HLE w/o tools | 59% | 36.2% | Claude Mythos 5 |
| GPQA-D | Coming soon | 90.5% | Coming soon |

### Multilingual

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

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

### Instruction Following

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.7% | Coming soon |

### Mathematics

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

| Benchmark | Claude Mythos 5 | Beam | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | 97.6% | Coming soon | Coming soon |
| AIME26 | Coming soon | 97.8% | Coming soon |

## FAQ

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

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 Beam cover on BenchLM?

Beam 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)
- [Beam vs Claude Mythos 5.1](/compare/claude-mythos-5-1-vs-reflection-beam)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)
- [Beam vs Claude Mythos Preview](/compare/claude-mythos-preview-vs-reflection-beam)

## Explore More

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