# Claude Haiku 5.5 vs Claude Sonnet 5.5

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

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

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Sonnet 5.5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Sonnet 5.5 has the higher overall point estimate 83.89 to 66.32. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 60.9 for Claude Haiku 5.5 and 84.5 for Claude Sonnet 5.5.
- The biggest single benchmark swing is Terminal-Bench 4.0 in Agentic, with scores of 39.20% and 70.60%.
- Claude Haiku 5.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Haiku 5.5 | Claude Sonnet 5.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 66.32 | 83.89 |
| Benchmarks Covered | 5 | 47 |
| Pricing (input/output) | $0.10 / $0.50 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Claude Sonnet 5.5
- Claude Haiku 5.5 public-lane score: 62.1 (Supported · #18/122)
- Claude Sonnet 5.5 public-lane score: 67.7 (Supported · #11/122)

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 39.20% | 70.60% | Claude Sonnet 5.5 |
| HLE w/ tools | 57.4% | 64.5% | Claude Sonnet 5.5 |
| DRACO | Coming soon | 87.0% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 59.9% | Coming soon |
| LAB all-pass (Harvey held-out) | Coming soon | 10.0% | Coming soon |
| LAB criterion-pass (Harvey held-out) | Coming soon | 93.1% | Coming soon |
| Toolathlon Verified Pass@3 | Coming soon | 85.2% | Coming soon |
| Toolathlon Verified Pass³ | Coming soon | 68.5% | Coming soon |
| Toolathlon Verified avg. turns | Coming soon | 31.6 turns | Coming soon |
| AutomationBench (Zapier 1.0.6) | Coming soon | 44.70% | Coming soon |
| Toolathlon-Verified | Coming soon | 77.8% | Coming soon |

### Coding

- Winner: Claude Sonnet 5.5
- Claude Haiku 5.5 public-lane score: 60.9 (Supported · #20/146)
- Claude Sonnet 5.5 public-lane score: 84.5 (Supported · #1/146)

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.4% | 46.2% | Claude Haiku 5.5 |
| CursorBench 4.0 | Coming soon | 55.5% | Coming soon |
| SWE-bench Pro | Coming soon | 81.3% | Coming soon |
| SWE Multilingual | Coming soon | 90.3% | Coming soon |
| SWE Multimodal | Coming soon | 54.3% | Coming soon |
| DeepSWE | Coming soon | 71.0% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 59.1% | Coming soon |
| ProgramBench | Coming soon | 79.7% | Coming soon |
| FrontierSWE v2 | Coming soon | 61.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: 79.2 (Unranked · 2 rankable rows)
- Claude Sonnet 5.5 public-lane score: 79.2 (#7/28)

### Multimodal & Grounded

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Sonnet 5.5 public-lane score: 83.3 (Unranked · 7 rankable rows)

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 46.4% | 61.6% | Claude Sonnet 5.5 |
| Chartography (tools) | Coming soon | 90.2% | Coming soon |
| BenchCAD Vision2Code (no tools) | Coming soon | 0.747 | Coming soon |
| BenchCAD Vision2Code (tools) | Coming soon | 0.963 | Coming soon |
| Biomedical image analysis | Coming soon | 72.2% | Coming soon |
| OfficeQA | Coming soon | 76.9% | Coming soon |
| OfficeQA Pro | Coming soon | 65.6% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Sonnet 5.5 public-lane score: 81.4 (Supported · #5/174)

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 45.9% | 56.9% | Claude Sonnet 5.5 |
| HealthBench (raw) | Coming soon | 69.4% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 65.4% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 77.1% | Coming soon |
| HealthBench Professional | Coming soon | 69.2% | Coming soon |
| BioMysteryBench (human-solvable) | Coming soon | 89.2% | Coming soon |
| BioMysteryBench (human-difficult) | Coming soon | 44.7% | Coming soon |
| SpatialBench Verified | Coming soon | 72.5% | Coming soon |
| SingleCellBench | Coming soon | 59.1% | Coming soon |
| Protein Design | Coming soon | 51.0% | Coming soon |
| Morphology-to-molecule matching | Coming soon | 25.0% | Coming soon |
| Medicinal chemistry | Coming soon | 65.3% | Coming soon |
| Protein Design library ranking | Coming soon | 54.8% | Coming soon |
| De novo protein-binder design | Coming soon | 82.3% | Coming soon |
| Protocols (troubleshooting) | Coming soon | 67.3% | Coming soon |
| Protocols (understanding) | Coming soon | 66.6% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Sonnet 5.5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | Coming soon | 92.1% | Coming soon |
| MILU | Coming soon | 91.6% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Sonnet 5.5 public-lane score: Coming soon

| Benchmark | Claude Haiku 5.5 | Claude Sonnet 5.5 | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | Coming soon | 86.8% | Coming soon |
| ArXivMath Aug. 2026 (tools) | Coming soon | 95.2% | Coming soon |

## FAQ

### Which is better overall, Claude Haiku 5.5 or Claude Sonnet 5.5?

Claude Sonnet 5.5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Haiku 5.5 and Claude Sonnet 5.5?

The widest category gap is in coding, where the averages are 60.9 for Claude Haiku 5.5 and 84.5 for Claude Sonnet 5.5.

### How many benchmarks does Claude Haiku 5.5 cover on BenchLM?

Claude Haiku 5.5 currently has 5 sourced benchmark scores on BenchLM.

### How many benchmarks does Claude Sonnet 5.5 cover on BenchLM?

Claude Sonnet 5.5 currently has 47 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Haiku 5.5 vs Claude Opus 5.5](/compare/claude-haiku-5-5-vs-claude-opus-5-5)
- [Claude Sonnet 5.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-5-5)
- [Claude Haiku 5.5 vs GPT-6 Astra](/compare/claude-haiku-5-5-vs-gpt-6-astra)
- [Claude Sonnet 5.5 vs GPT-6 Astra](/compare/claude-sonnet-5-5-vs-gpt-6-astra)

## Explore More

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