# Claude Opus 4.5 vs Claude Opus 5.5

> Side-by-side benchmark comparison for Claude Opus 4.5 and Claude Opus 5.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-5-vs-claude-opus-5-5
- 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 4.5 and Claude Opus 5.5 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 Opus 5.5 has the lower published output-token price.
- Claude Opus 5.5 has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Opus 4.5 | Claude Opus 5.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | 58.72 | 81.03 |
| Benchmarks Covered | 45 | 47 |
| Pricing (input/output) | $5.00 / $25.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 43.4 (Estimated · #106/157)
- Claude Opus 5.5 public-lane score: 82.9 (Supported · #1/157)

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.3% | Coming soon | Coming soon |
| OSWorld-Verified | 66.3% | Coming soon | Coming soon |
| OSWorld | 66.3% | Coming soon | Coming soon |
| Claw-Eval | 59.6% | Coming soon | Coming soon |
| QwenClawBench | 52.3% | Coming soon | Coming soon |
| τ³-bench results | 70.2% | Coming soon | Coming soon |
| VITA-Bench | 23.3% | Coming soon | Coming soon |
| DeepPlanning | 26.4% | Coming soon | Coming soon |
| Toolathlon | 43.5% | Coming soon | Coming soon |
| MCP Atlas | 42.3% | Coming soon | Coming soon |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | Coming soon | Coming soon |
| CyberGym | 50.6% | Coming soon | Coming soon |
| Gert Labs | 64.23% | Coming soon | Coming soon |
| JobBench | 32.3% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 66.40% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 58.7% | Coming soon |
| AutomationBench | Coming soon | 40.0% | Coming soon |
| HLE w/ tools | Coming soon | 67.7% | 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 |

### Coding

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 56.5 (Estimated · #38/159)
- Claude Opus 5.5 public-lane score: 80.1 (Supported · #2/159)

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | Coming soon | Coming soon |
| LiveCodeBench v6 | 84.8% | Coming soon | Coming soon |
| SWE-bench Pro | 57.1% | 89.9% | Claude Opus 5.5 |
| SWE Multilingual | 77.5% | 93.9% | Claude Opus 5.5 |
| NL2Repo | 43.2% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 54.4% | Coming soon |
| cursorBench40 | Coming soon | 57.8% | 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 |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 72.1 (Unranked · 4 rankable rows)
- Claude Opus 5.5 public-lane score: 78.5 (#4/17)

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 23.5 (#48/50)
- Claude Opus 5.5 public-lane score: 88.8 (#3/50)

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 70.6% | Coming soon | Coming soon |
| MathVision | 74.3% | Coming soon | Coming soon |
| CharXiv | 68.5% | Coming soon | Coming soon |
| VideoMMMU | 84.4% | Coming soon | Coming soon |
| ScreenSpot Pro | 45.7% | Coming soon | Coming soon |
| V* | 67.0% | Coming soon | Coming soon |
| Chartography (tools) | Coming soon | 89.0% | Coming soon |
| Chartography (no tools) | Coming soon | 64.4% | 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: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 54.3 (Estimated · #62/189)
- Claude Opus 5.5 public-lane score: 81.8 (Estimated · #4/189)

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | Coming soon | Coming soon |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | Coming soon | Coming soon |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |
| HLE w/o tools | Coming soon | 64.4% | Coming soon |
| 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: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 82.9 (#2/12)
- Claude Opus 5.5 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |
| GMMLU | Coming soon | 94.3% | Coming soon |
| MILU | Coming soon | 93.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 30.6 (#114/124)
- Claude Opus 5.5 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | Coming soon | Coming soon |
| IFBench | 58% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Opus 4.5 public-lane score: 57.9 (#6/7)
- Claude Opus 5.5 public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | Coming soon | Coming soon |
| HMMT Feb 2025 | 92.9% | Coming soon | Coming soon |
| HMMT Nov 2025 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2026 | 85.3% | Coming soon | Coming soon |
| MMAnswerBench | 84.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 20.690% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (no tools) | Coming soon | 91.2% | Coming soon |
| ArXivMath Aug. 2026 (tools) | Coming soon | 96.9% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Opus 4.5 and Claude Opus 5.5?

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 4.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-vs-claude-opus-4-5-thinking)
- [Claude Opus 5.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-claude-opus-5-5)
- [Claude Opus 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-4-5)
- [Claude Opus 5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5-5)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [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)