# Claude Opus 5.5 vs Gemini 4 Carbon

> Side-by-side benchmark comparison for Claude Opus 5.5 and Gemini 4 Carbon across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-gemini-4-carbon
- Last updated: October 28, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Gemini 4 Carbon leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Gemini 4 Carbon has the higher overall point estimate 88.42 to 86.31. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 86.1 for Claude Opus 5.5 and 79.5 for Gemini 4 Carbon.
- The biggest single benchmark swing is GraphWalks BFS 256K–1M in Reasoning, with scores of 66.8% and 96.2%.
- Gemini 4 Carbon 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 5.5 | Gemini 4 Carbon |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | null |
| Overall Score | 86.31 | 88.42 |
| Benchmarks Covered | 66 | 9 |
| Pricing (input/output) | $4.00 / $20.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 90 (Supported · #1/134)
- Gemini 4 Carbon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | 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% | 53.9% | Gemini 4 Carbon |
| HLE w/ tools | 67.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 48.7% | Coming soon | Coming soon |
| 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 |
| CWE-bench v1 | 67.0% | 71.0% | Gemini 4 Carbon |
| Hermes Index | 63.3% | Coming soon | Coming soon |
| Hermes Bench | 76.7% | Coming soon | Coming soon |
| MazeBench | 13% | Coming soon | Coming soon |
| OSWorld 2.1 | 81.8% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 87.2% | 81.5% | Claude Opus 5.5 |
| ExploitGym | Coming soon | 53.5% | Coming soon |

### Coding

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 83.1 (Supported · #2/156)
- Gemini 4 Carbon public-lane score: 82.2 (Supported · #3/156)

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 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% | 61.2% | Claude Opus 5.5 |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 49.3% | Coming soon | Coming soon |
| Bug Hunt Bench | 41.7 fixes | Coming soon | Coming soon |
| FrontierCode 2.0 | 45.5% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 86.1 (#4/26)
- Gemini 4 Carbon public-lane score: 79.5 (Unranked · 2 rankable rows)

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | Winner |
|-----------|-----------|-----------|--------|
| STEMBench | 2.62 | Coming soon | Coming soon |
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 91.7% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 66.8% | 96.2% | Gemini 4 Carbon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 91.8 (#3/58)
- Gemini 4 Carbon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | Winner |
|-----------|-----------|-----------|--------|
| ExtractBench Pro | 51% | Coming soon | Coming soon |
| ExtractBench (LlamaIndex) | 86.06% | Coming soon | Coming soon |
| ParseBench | 78.89% | Coming soon | Coming soon |
| Chartography (tools) | 89.0% | Coming soon | Coming soon |
| Chartography (no tools) | 64.4% | 72.5% | Gemini 4 Carbon |
| 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 |
| Blueprint-Bench 2 | Coming soon | 58.6% | Coming soon |

### Knowledge

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 89.5 (Supported · #1/178)
- Gemini 4 Carbon public-lane score: 88.2 (Supported · #2/178)

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | 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 |

### Multilingual

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- Gemini 4 Carbon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.3% | Coming soon | Coming soon |
| MILU | 93.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: Coming soon
- Gemini 4 Carbon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | 0.0% | Gemini 4 Carbon |

### Mathematics

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 97.3 (Unranked · 4 rankable rows)
- Gemini 4 Carbon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Carbon | 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) | 91.228% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 95.000% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Opus 5.5 or Gemini 4 Carbon?

Gemini 4 Carbon has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Opus 5.5 and Gemini 4 Carbon?

The widest category gap is in reasoning, where the averages are 86.1 for Claude Opus 5.5 and 79.5 for Gemini 4 Carbon.

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

Claude Opus 5.5 currently has 66 sourced benchmark scores on BenchLM.

### How many benchmarks does Gemini 4 Carbon cover on BenchLM?

Gemini 4 Carbon currently has 9 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5.5 vs Gemini 4 Argon](/compare/claude-opus-5-5-vs-gemini-4-argon)
- [Gemini 4 Carbon vs Gemini 4 Argon](/compare/gemini-4-argon-vs-gemini-4-carbon)
- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)
- [Gemini 4 Carbon vs GPT-6 Astra](/compare/gemini-4-carbon-vs-gpt-6-astra)

## Explore More

- [Claude Opus 5.5 profile](/models/claude-opus-5-5)
- [Gemini 4 Carbon profile](/models/gemini-4-carbon)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)