# Claude Haiku 5.5 vs Claude Opus 5.5

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

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

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

## Quick Verdict

Claude Opus 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 Opus 5.5 has the higher overall point estimate 86.37 to 66.32. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 62.1 for Claude Haiku 5.5 and 88.8 for Claude Opus 5.5.
- The biggest single benchmark swing is Terminal-Bench 4.0 in Agentic, with scores of 39.20% and 66.40%.
- 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 Opus 5.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 66.32 | 86.37 |
| Benchmarks Covered | 5 | 53 |
| Pricing (input/output) | $0.10 / $0.50 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 5.5
- Claude Haiku 5.5 public-lane score: 62.1 (Supported · #18/122)
- Claude Opus 5.5 public-lane score: 88.8 (Supported · #1/122)

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 39.20% | 66.40% | Claude Opus 5.5 |
| HLE w/ tools | 57.4% | 67.7% | Claude Opus 5.5 |
| Terminal-Bench-Science 0.1 | Coming soon | 58.7% | Coming soon |
| AutomationBench | Coming soon | 40.0% | Coming soon |
| OSWorld 2.0 | Coming soon | 48.7% | Coming soon |
| LAB all-pass (Harvey held-out) | Coming soon | 8.3% | Coming soon |
| LAB criterion-pass (Harvey held-out) | Coming soon | 91.2% | Coming soon |
| Toolathlon-Verified | Coming soon | 77.8% | Coming soon |
| Toolathlon Verified Pass@3 | Coming soon | 82.4% | Coming soon |
| Toolathlon Verified Pass³ | Coming soon | 72.2% | Coming soon |
| Toolathlon Verified avg. turns | Coming soon | 26.9 turns | Coming soon |
| CWE-bench v1 | Coming soon | 67.0% | Coming soon |

### Coding

- Winner: Claude Opus 5.5
- Claude Haiku 5.5 public-lane score: 60.9 (Supported · #20/146)
- Claude Opus 5.5 public-lane score: 83.7 (Supported · #2/146)

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 46.4% | 54.4% | Claude Opus 5.5 |
| CursorBench 4.0 | Coming soon | 57.8% | Coming soon |
| SWE-bench Pro | Coming soon | 89.9% | Coming soon |
| SWE Multilingual | Coming soon | 93.9% | Coming soon |
| SWE Multimodal | Coming soon | 61.4% | Coming soon |
| DeepSWE | Coming soon | 74.2% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 63.6% | Coming soon |
| FrontierSWE v2 | Coming soon | 62.3% | Coming soon |
| ProgramBench | Coming soon | 91.2% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 49.3% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: 79.2 (Unranked · 2 rankable rows)
- Claude Opus 5.5 public-lane score: 82.4 (#3/28)

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 97.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 91.7% | Coming soon |
| GraphWalks BFS 256K–1M | Coming soon | 66.8% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Opus 5.5 public-lane score: 88.8 (#3/49)

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 46.4% | 64.4% | Claude Opus 5.5 |
| Chartography (tools) | Coming soon | 89.0% | Coming soon |
| BenchCAD Vision2Code (no tools) | Coming soon | 0.730 | Coming soon |
| BenchCAD Vision2Code (tools) | Coming soon | 0.962 | Coming soon |
| Biomedical image analysis | Coming soon | 71.4% | Coming soon |
| OfficeQA | Coming soon | 78.9% | Coming soon |
| OfficeQA Pro | Coming soon | 67.7% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Haiku 5.5 public-lane score: Coming soon
- Claude Opus 5.5 public-lane score: 88.3 (Supported · #1/174)

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 45.9% | 64.4% | Claude Opus 5.5 |
| HealthBench (raw) | Coming soon | 68.1% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 60.6% | Coming soon |
| HealthBench Professional | Coming soon | 65.6% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 77.1% | Coming soon |
| BioMysteryBench (human-solvable) | Coming soon | 89.3% | Coming soon |
| BioMysteryBench (human-difficult) | Coming soon | 50.0% | Coming soon |
| SpatialBench Verified | Coming soon | 72.0% | Coming soon |
| SingleCellBench | Coming soon | 61.2% | Coming soon |
| Morphology-to-molecule matching | Coming soon | 34.0% | Coming soon |
| Medicinal chemistry | Coming soon | 63.5% | Coming soon |
| Protein Design | Coming soon | 60.2% | Coming soon |
| Protein Design library ranking | Coming soon | 56.0% | Coming soon |
| De novo protein-binder design | Coming soon | 82.6% | Coming soon |
| Protocols (troubleshooting) | Coming soon | 73.7% | Coming soon |
| Protocols (understanding) | Coming soon | 69.0% | Coming soon |

### Multilingual

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

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | Coming soon | 94.3% | Coming soon |
| MILU | Coming soon | 93.1% | Coming soon |

### Instruction Following

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

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 1.0% | Coming soon |

### Mathematics

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

| Benchmark | Claude Haiku 5.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | Coming soon | 91.2% | Coming soon |
| ArXivMath Aug. 2026 (tools) | Coming soon | 96.9% | Coming soon |

## FAQ

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

Claude Opus 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 Opus 5.5?

The widest category gap is in agentic, where the averages are 62.1 for Claude Haiku 5.5 and 88.8 for Claude Opus 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 Opus 5.5 cover on BenchLM?

Claude Opus 5.5 currently has 53 sourced benchmark scores on BenchLM.

## Related Comparisons

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

## Explore More

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