# Claude Opus 5 vs Claude Opus 5.5

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

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

- Shared sourced benchmarks: 39
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Opus 5.5 if you want the stronger benchmark profile. Claude Opus 5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Opus 5.5 leads overall 81.03 to 80.93.
- The clearest category separation is in agentic, where the averages are 78.8 for Claude Opus 5 and 82.7 for Claude Opus 5.5.
- The biggest single benchmark swing is Chartography (no tools) in Multimodal & Grounded, with scores of 29.6% and 64.4%.
- Claude Opus 5.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Opus 5.5 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Opus 5 | Claude Opus 5.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | null | 1M |
| Overall Score | 80.93 | 81.03 |
| Benchmarks Covered | 75 | 48 |
| Pricing (input/output) | $5.00 / $25.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: Claude Opus 5.5
- Claude Opus 5 public-lane score: 78.8 (Supported · #3/156)
- Claude Opus 5.5 public-lane score: 82.7 (Supported · #1/156)

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 42.7% | Coming soon | Coming soon |
| BrowseComp | 90.8% | Coming soon | Coming soon |
| HLE w/ tools | 64.7% | 67.7% | Claude Opus 5.5 |
| DeepSearchQA | 95.0% | Coming soon | Coming soon |
| DRACO | 88.6% | Coming soon | Coming soon |
| BrowseComp (10-agent, prerelease) | 93.6% | Coming soon | Coming soon |
| OSWorld 2.0 | 70.6% | 48.7% | Claude Opus 5 |
| MCP Atlas | 85.8% | Coming soon | Coming soon |
| MCP-Atlas claim coverage | 89.1% | Coming soon | Coming soon |
| LAB all-pass (Anthropic harness) | 23.58% | Coming soon | Coming soon |
| LAB criterion-pass (Anthropic harness) | 93.74% | Coming soon | Coming soon |
| LAB all-pass (Harvey held-out) | 11.7% | 8.3% | Claude Opus 5 |
| LAB criterion-pass (Harvey held-out) | 94.1% | 91.2% | Claude Opus 5 |
| Toolathlon-Verified | 80.6% | 77.8% | Claude Opus 5 |
| Toolathlon Verified Pass@3 | 87.0% | 82.4% | Claude Opus 5 |
| Toolathlon Verified Pass³ | 73.1% | 72.2% | Claude Opus 5 |
| Toolathlon Verified avg. turns | 23.5 turns | 26.9 turns | Claude Opus 5.5 |
| AutomationBench | 26.0% | 40.0% | Claude Opus 5.5 |
| Terminal-Bench 2.1 (Vals) | 84.6% | Coming soon | Coming soon |
| ApprenticeBench | 36% | 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 |

### Coding

- Winner: Coming soon
- Claude Opus 5 public-lane score: 75.9 (Supported · #5/159)
- Claude Opus 5.5 public-lane score: 76 (Estimated · #4/159)

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 27 fixes | Coming soon | Coming soon |
| SWE-bench Verified | 96% | Coming soon | Coming soon |
| SWE-bench Pro | 79.2% | 89.9% | Claude Opus 5.5 |
| SWE Multilingual | 89.5% | 93.9% | Claude Opus 5.5 |
| SWE Multimodal | 59.4% | 61.4% | Claude Opus 5.5 |
| DeepSWE | 68.8% | 74.2% | Claude Opus 5.5 |
| FrontierCode 1.1 Main | 53.4% | 54.4% | Claude Opus 5.5 |
| FrontierCode 1.1 Extended | 63.6% | 63.6% | Tie |
| FrontierSWE v2 | 52.0% | 62.3% | Claude Opus 5.5 |
| ProgramBench (episode 1) | 83.0% | Coming soon | Coming soon |
| ProgramBench | 93.0% | 91.2% | Claude Opus 5 |
| cursorBench32 | 70.0% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| VulcanBench CII v1 | 96.4% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 89.0% | Coming soon | Coming soon |
| SWE-bench (Vals) | 97.0% | Coming soon | Coming soon |
| cursorBench40 | 46.6% | 57.8% | Claude Opus 5.5 |

### Reasoning

- Winner: Coming soon
- Claude Opus 5 public-lane score: 75.7 (#10/19)
- Claude Opus 5.5 public-lane score: 78.5 (#4/19)

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 90.4% | Coming soon | Coming soon |
| ARC-AGI-3 | 30.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Tie
- Claude Opus 5 public-lane score: 88.8 (#2/50)
- Claude Opus 5.5 public-lane score: 88.8 (#3/50)

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | 29.6% | 64.4% | Claude Opus 5.5 |
| Chartography (tools) | 83.0% | 89.0% | Claude Opus 5.5 |
| BenchCAD Vision2Code (no tools) | 0.366 | 0.730 | Claude Opus 5.5 |
| BenchCAD Vision2Code (tools) | 0.821 | 0.962 | Claude Opus 5.5 |
| GDP.pdf (no tools) | 83.4% | Coming soon | Coming soon |
| GDP.pdf (tools) | 85.5% | Coming soon | Coming soon |
| OfficeQA | 78.1% | 78.9% | Claude Opus 5.5 |
| OfficeQA Pro | 66.9% | 67.7% | Claude Opus 5.5 |
| Biomedical image analysis | Coming soon | 71.4% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Opus 5 public-lane score: 81.4 (Supported · #5/187)
- Claude Opus 5.5 public-lane score: 81.5 (Estimated · #3/187)

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 64.7% | 67.7% | Claude Opus 5.5 |
| HLE w/o tools | 56.3% | 64.4% | Claude Opus 5.5 |
| HLE-Verified | 54.4% | Coming soon | Coming soon |
| LABBench2 | 84.2% | Coming soon | Coming soon |
| HealthBench (raw) | 67.1% | 68.1% | Claude Opus 5.5 |
| HealthBench (length-adjusted) | 57.8% | 60.6% | Claude Opus 5.5 |
| HealthBench Professional | 59.8% | 65.6% | Claude Opus 5.5 |
| HealthBench Professional (raw) | 73.4% | 77.1% | Claude Opus 5.5 |
| BioMysteryBench (human-solvable) | 90.1% | 89.3% | Claude Opus 5 |
| BioMysteryBench (human-difficult) | 49.4% | 50.0% | Claude Opus 5.5 |
| SpatialBench Verified | 72.5% | 72.0% | Claude Opus 5 |
| SingleCellBench | 60.6% | 61.2% | Claude Opus 5.5 |
| ProteinGym Hard | 47.7% | Coming soon | Coming soon |
| Protein Design | 42.5% | 60.2% | Claude Opus 5.5 |
| Organic chemistry V2 | 61.6% | Coming soon | Coming soon |
| Protocols (troubleshooting) | 61.1% | 73.7% | Claude Opus 5.5 |
| Protocols (understanding) | 78.4% | 69.0% | Claude Opus 5 |
| GPQA Diamond (Vals) | 93.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 91.6% | Coming soon | Coming soon |
| Morphology-to-molecule matching | Coming soon | 34.0% | Coming soon |
| Medicinal chemistry | Coming soon | 63.5% | Coming soon |
| Protein Design library ranking | Coming soon | 56.0% | Coming soon |
| De novo protein-binder design | Coming soon | 82.6% | Coming soon |

### Multilingual

- Winner: Coming soon
- Claude Opus 5 public-lane score: Coming soon
- Claude Opus 5.5 public-lane score: Coming soon

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 92.5% | 94.3% | Claude Opus 5.5 |
| MILU | 92.1% | 93.1% | Claude Opus 5.5 |
| INCLUDE | 89.8% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Claude Opus 5 public-lane score: Coming soon
- Claude Opus 5.5 public-lane score: Coming soon

| Benchmark | Claude Opus 5 | Claude Opus 5.5 | Winner |
|-----------|-----------|-----------|--------|
| IMO 2026 | 42/42 | Coming soon | Coming soon |
| RiemannBench (no tools) | 60.0% | Coming soon | Coming soon |
| RiemannBench (tools) | 79.0% | Coming soon | Coming soon |
| ArXivMath Jun. 2026 (no tools) | 90.8% | Coming soon | Coming soon |
| ArXivMath Jun. 2026 (tools) | 91.3% | 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

### Which is better overall, Claude Opus 5 or Claude Opus 5.5?

Claude Opus 5.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 5 and Claude Opus 5.5?

The widest category gap is in agentic, where the averages are 78.8 for Claude Opus 5 and 82.7 for Claude Opus 5.5.

### How many benchmarks does Claude Opus 5 cover on BenchLM?

Claude Opus 5 currently has 75 sourced benchmark scores on BenchLM.

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

Claude Opus 5.5 currently has 48 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5)
- [Claude Opus 5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Claude Opus 5 vs GPT-6 Astra](/compare/claude-opus-5-vs-gpt-6-astra)
- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)

## Explore More

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