# Claude Opus 5.5 vs Claude Sonnet 4.6

> Side-by-side benchmark comparison for Claude Opus 5.5 and Claude Sonnet 4.6 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-claude-sonnet-4-6
- Last updated: September 22, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Opus 5.5 and Claude Sonnet 4.6 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Claude Sonnet 4.6 has the lower published output-token price.
- Claude Opus 5.5 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 5.5 | Claude Sonnet 4.6 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 200K |
| Independent public score (not head-to-head) | 81.03 | 63.17 |
| Benchmarks Covered | 47 | 26 |
| Pricing (input/output) | $4.00 / $20.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: 82.9 (Supported · #1/157)
- Claude Sonnet 4.6 public-lane score: 43.8 (Supported · #103/157)

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 66.40% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 58.7% | Coming soon | Coming soon |
| AutomationBench | 40.0% | Coming soon | Coming soon |
| HLE w/ tools | 67.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 48.7% | 8.3% | Claude Opus 5.5 |
| LAB all-pass (Harvey held-out) | 8.3% | Coming soon | Coming soon |
| LAB criterion-pass (Harvey held-out) | 91.2% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 82.4% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 72.2% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 26.9 turns | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 59.1% | Coming soon |
| OSWorld-Verified | Coming soon | 72.1% | Coming soon |
| Claw-Eval | Coming soon | 67.8% | Coming soon |
| CyberGym | Coming soon | 65.2% | Coming soon |
| Gert Labs | Coming soon | 62.92% | Coming soon |
| JobBench | Coming soon | 36.9% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 57.3% | Coming soon |
| ApprenticeBench | Coming soon | 2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: 80.1 (Supported · #2/159)
- Claude Sonnet 4.6 public-lane score: 52 (Supported · #53/159)

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | 24.3% | Claude Opus 5.5 |
| cursorBench40 | 57.8% | Coming soon | Coming soon |
| SWE-bench Pro | 89.9% | Coming soon | Coming soon |
| SWE Multilingual | 93.9% | Coming soon | Coming soon |
| SWE Multimodal | 61.4% | Coming soon | Coming soon |
| DeepSWE | 74.2% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 62.3% | Coming soon | Coming soon |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 79.6% | Coming soon |
| SWE-Rebench | Coming soon | 60.7% | Coming soon |
| React Native Evals | Coming soon | 80.6% | Coming soon |
| Vibe Code Bench | Coming soon | 51.48% | Coming soon |
| cursorBench31 | Coming soon | 48.8% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 82.1% | Coming soon |
| SWE-bench (Vals) | Coming soon | 77.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: 78.5 (#4/17)
- Claude Sonnet 4.6 public-lane score: 67.9 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: 88.8 (#3/50)
- Claude Sonnet 4.6 public-lane score: 54.1 (#35/50)

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (tools) | 89.0% | Coming soon | Coming soon |
| Chartography (no tools) | 64.4% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.730 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.962 | Coming soon | Coming soon |
| Biomedical image analysis | 71.4% | Coming soon | Coming soon |
| OfficeQA | 78.9% | Coming soon | Coming soon |
| OfficeQA Pro | 67.7% | Coming soon | Coming soon |
| CharXiv | Coming soon | 77.4% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: 81.8 (Estimated · #4/189)
- Claude Sonnet 4.6 public-lane score: 55.9 (Supported · #53/189)

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| HLE w/o tools | 64.4% | Coming soon | Coming soon |
| HealthBench (raw) | 68.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 60.6% | Coming soon | Coming soon |
| HealthBench Professional | 65.6% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 77.1% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 89.3% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 50.0% | Coming soon | Coming soon |
| SpatialBench Verified | 72.0% | Coming soon | Coming soon |
| SingleCellBench | 61.2% | Coming soon | Coming soon |
| Morphology-to-molecule matching | 34.0% | Coming soon | Coming soon |
| Medicinal chemistry | 63.5% | Coming soon | Coming soon |
| Protein Design | 60.2% | Coming soon | Coming soon |
| Protein Design library ranking | 56.0% | Coming soon | Coming soon |
| De novo protein-binder design | 82.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 73.7% | Coming soon | Coming soon |
| Protocols (understanding) | 69.0% | Coming soon | Coming soon |
| GPQA | Coming soon | 89.9% | Coming soon |
| SuperGPQA | Coming soon | 95% | Coming soon |
| MMLU-Pro | Coming soon | 79.2% | Coming soon |
| HLE | Coming soon | 49% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 85.6% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 87.3% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: Coming soon
- Claude Sonnet 4.6 public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.3% | Coming soon | Coming soon |
| MILU | 93.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: Coming soon
- Claude Sonnet 4.6 public-lane score: 46.6 (#88/124)

### Mathematics

- Winner: Insufficient shared evidence
- Claude Opus 5.5 public-lane score: Coming soon
- Claude Sonnet 4.6 public-lane score: 48.8 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 5.5 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 91.2% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 96.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 32.400% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 8.300% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 5.5 and Claude Sonnet 4.6?

Not yet. The models share only 2 sourced benchmark rows, 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 Opus 5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Claude Sonnet 4.6 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-sonnet-4-6)
- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)
- [Claude Sonnet 4.6 vs GPT-6 Astra](/compare/claude-sonnet-4-6-vs-gpt-6-astra)

## Explore More

- [Claude Opus 5.5 profile](/models/claude-opus-5-5)
- [Claude Sonnet 4.6 profile](/models/claude-sonnet-4-6)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)