# Claude Haiku 5.5 vs Claude Mythos 5

> Side-by-side benchmark comparison for Claude Haiku 5.5 and Claude Mythos 5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-5-5-vs-claude-mythos-5
- Last updated: October 7, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Haiku 5.5 and Claude Mythos 5 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Claude Haiku 5.5 has the lower published output-token price.

## Model Snapshot

| Property | Claude Haiku 5.5 | Claude Mythos 5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M+ |
| Independent public score (not head-to-head) | 66.32 | null |
| Benchmarks Covered | 5 | 15 |
| Pricing (input/output) | $0.10 / $0.50 | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 62.1 (Supported · #18/122)
- Claude Mythos 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 39.20% | Coming soon | Coming soon |
| HLE w/ tools | 57.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.0% | Coming soon |
| OSWorld-Verified | Coming soon | 85% | Coming soon |
| BrowseComp | Coming soon | 88% | Coming soon |
| CyberGym | Coming soon | 83.8% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 60.9 (Supported · #20/146)
- Claude Mythos 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.4% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 95.5% | Coming soon |
| SWE-bench Pro | Coming soon | 80.3% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: 79.2 (Unranked · 2 rankable rows)
- Claude Mythos 5 public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Mythos 5 public-lane score: 86.2 (Unranked · 3 rankable rows)

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 46.4% | Coming soon | Coming soon |
| SWE-bench Multimodal | Coming soon | 54.9% | Coming soon |
| CharXiv | Coming soon | 93.5% | Coming soon |
| CharXiv w/o tools | Coming soon | 88.9% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Mythos 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 45.9% | 59% | Claude Mythos 5 |
| GPQA | Coming soon | 94.1% | Coming soon |
| HLE | Coming soon | 64.5% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Mythos 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE Multilingual | Coming soon | 92.2% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Mythos 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Mythos 5 | Winner |
|-----------|-----------|-----------|--------|
| USAMO 2026 | Coming soon | 97.6% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Haiku 5.5 and Claude Mythos 5?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Haiku 5.5 vs Claude Mythos 5.1](/compare/claude-haiku-5-5-vs-claude-mythos-5-1)
- [Claude Mythos 5 vs Claude Mythos 5.1](/compare/claude-mythos-5-vs-claude-mythos-5-1)
- [Claude Haiku 5.5 vs Claude Mythos Preview](/compare/claude-haiku-5-5-vs-claude-mythos-preview)
- [Claude Mythos 5 vs Claude Mythos Preview](/compare/claude-mythos-5-vs-claude-mythos-preview)

## Explore More

- [Claude Haiku 5.5 profile](/models/claude-haiku-5-5)
- [Claude Mythos 5 profile](/models/claude-mythos-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)