# Claude Opus 4.6 vs GPT-5.5 Pro

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

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

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

## Quick Verdict

Pick Claude Opus 4.6 if you want the stronger benchmark profile. GPT-5.5 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Opus 4.6 leads overall 69.84 to 63.07.
- The clearest category separation is in mathematics, where the averages are 58.6 for Claude Opus 4.6 and 70.2 for GPT-5.5 Pro.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 22.900% and 39.600%.
- Claude Opus 4.6 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Opus 4.6 | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.84 | 63.07 |
| Benchmarks Covered | 33 | 6 |
| Pricing (input/output) | $5.00 / $25.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 54.6 (Supported · #39/151)
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)

| Benchmark | Claude Opus 4.6 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 65.4% | Coming soon | Coming soon |
| BrowseComp | 83.7% | 90.1% | GPT-5.5 Pro |
| OSWorld-Verified | 72.7% | Coming soon | Coming soon |
| Claw-Eval | 70.4% | Coming soon | Coming soon |
| DeepSearchQA | 73.7% | Coming soon | Coming soon |
| CyberGym | 66.6% | Coming soon | Coming soon |
| Gert Labs | 61.85% | Coming soon | Coming soon |
| ResearchClawBench | 19.9% | Coming soon | Coming soon |
| JobBench | 36.7% | Coming soon | Coming soon |

### Coding

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 56.5 (Supported · #40/183)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 4.6 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.8% | Coming soon | Coming soon |
| SWE-bench Verified* | 75.6% | Coming soon | Coming soon |
| LiveCodeBench Pro | 70.7% | Coming soon | Coming soon |
| SWE-bench Pro | 53.4% | Coming soon | Coming soon |
| SWE-Rebench | 65.3% | Coming soon | Coming soon |
| React Native Evals | 84.1% | Coming soon | Coming soon |
| Vibe Code Bench | 57.57% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 26.9% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 59.5 (#28/48)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Claude Opus 4.6 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 77.3% | Coming soon | Coming soon |
| ERQA | 51.6% | Coming soon | Coming soon |
| ScreenSpot Pro | 83.1% | Coming soon | Coming soon |
| MedXpertQA (MM) | 64.8% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 65.8 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: Coming soon

### Knowledge

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 61.8 (Estimated · #33/181)
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)

| Benchmark | Claude Opus 4.6 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 91.3% | Coming soon | Coming soon |
| GPQA-D | 89.2% | Coming soon | Coming soon |
| SuperGPQA | 95% | Coming soon | Coming soon |
| MMLU-Pro | 82% | Coming soon | Coming soon |
| MMLU-Pro (Arcee) | 89.1% | Coming soon | Coming soon |
| HLE | 53% | 57.2% | GPT-5.5 Pro |
| HLE w/o tools | 40% | 43.1% | GPT-5.5 Pro |
| HealthBench Hard | 14.8% | Coming soon | Coming soon |
| MedXpertQA (Text) | 52.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 52.3 (#76/120)
- GPT-5.5 Pro public-lane score: Coming soon

### Mathematics

- Winner: Coming soon
- Claude Opus 4.6 public-lane score: 58.6 (Unranked · 3 rankable rows)
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)

| Benchmark | Claude Opus 4.6 | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| AIME25 (Arcee) | 99.8% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 40.700% | 51.000% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 22.900% | 39.600% | GPT-5.5 Pro |
| FrontierMath (legacy) | Coming soon | 52.4% | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.6 or GPT-5.5 Pro?

Claude Opus 4.6 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Opus 4.6 and GPT-5.5 Pro?

The widest category gap is in mathematics, where the averages are 58.6 for Claude Opus 4.6 and 70.2 for GPT-5.5 Pro.

### How many benchmarks does Claude Opus 4.6 cover on BenchLM?

Claude Opus 4.6 currently has 33 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.5 Pro cover on BenchLM?

GPT-5.5 Pro currently has 6 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.6 vs Claude Opus 4.6 (Adaptive)](/compare/claude-opus-4-6-vs-claude-opus-4-6-thinking)
- [GPT-5.5 Pro vs Claude Opus 4.6 (Adaptive)](/compare/claude-opus-4-6-thinking-vs-gpt-5-5-pro)
- [Claude Opus 4.6 vs GPT-5.5](/compare/claude-opus-4-6-vs-gpt-5-5)
- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)

## Explore More

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