# Claude Opus 5.5 vs Gemini 4 Argon

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

- Canonical page: https://benchlm.ai/compare/claude-opus-5-5-vs-gemini-4-argon
- Last updated: September 30, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Opus 5.5 if you want the stronger benchmark profile. Gemini 4 Argon 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 86.85 to 64.59.
- The clearest category separation is in agentic, where the averages are 88 for Claude Opus 5.5 and 63.7 for Gemini 4 Argon.
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 48.7% and 69.2%.
- Gemini 4 Argon 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 Argon |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | null |
| Overall Score | 86.85 | 64.59 |
| Benchmarks Covered | 53 | 17 |
| Pricing (input/output) | $4.00 / $20.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Opus 5.5 public-lane score: 88 (Supported · #1/119)
- Gemini 4 Argon public-lane score: 63.7 (Estimated · #14/119)

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 66.40% | 57.40% | Claude Opus 5.5 |
| Terminal-Bench-Science 0.1 | 58.7% | Coming soon | Coming soon |
| AutomationBench | 40.0% | 51.3% | Gemini 4 Argon |
| HLE w/ tools | 67.7% | Coming soon | Coming soon |
| OSWorld 2.0 | 48.7% | 69.2% | Gemini 4 Argon |
| 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% | 68.0% | Gemini 4 Argon |
| Finance Agent v2 | Coming soon | 65.4% | Coming soon |
| Agents' Last Exam | Coming soon | 39.5% | Coming soon |
| Terminal-Bench-Science 0.1 (6x verifier timeout) | Coming soon | 57.6% | Coming soon |

### Coding

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 83.8 (Supported · #2/144)
- Gemini 4 Argon public-lane score: 68.4 (Supported · #8/144)

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| FrontierCode 1.1 Main | 54.4% | Coming soon | Coming soon |
| 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% | 77.9% | Gemini 4 Argon |
| FrontierCode 1.1 Extended | 63.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 62.3% | 55.1% | Claude Opus 5.5 |
| ProgramBench | 91.2% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 49.3% | 45.3% | Claude Opus 5.5 |
| Vibe Code Bench | Coming soon | 91.90% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 82.4 (#2/27)
- Gemini 4 Argon public-lane score: 77.1 (Unranked · 3 rankable rows)

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 91.7% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 66.8% | 84.2% | Gemini 4 Argon |
| Graphwalks BFS 128K | Coming soon | 99.7% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Opus 5.5 public-lane score: 88.8 (#3/49)
- Gemini 4 Argon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| Chartography (tools) | 89.0% | Coming soon | Coming soon |
| Chartography (no tools) | 64.4% | 71.6% | Gemini 4 Argon |
| 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 |
| LVBench | Coming soon | 91.7% | Coming soon |

### Knowledge

- Winner: Claude Opus 5.5
- Claude Opus 5.5 public-lane score: 88.9 (Supported · #1/170)
- Gemini 4 Argon public-lane score: 72.9 (Supported · #11/170)

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | 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 |
| LABBench2 | Coming soon | 88.8% | Coming soon |

### Multilingual

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

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | 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 Argon public-lane score: Coming soon

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | 0.7% | Gemini 4 Argon |

### Mathematics

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

| Benchmark | Claude Opus 5.5 | Gemini 4 Argon | Winner |
|-----------|-----------|-----------|--------|
| ArXivMath Aug. 2026 (no tools) | 91.2% | Coming soon | Coming soon |
| ArXivMath Aug. 2026 (tools) | 96.9% | Coming soon | Coming soon |

## FAQ

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

Claude Opus 5.5 is ahead overall on BenchLM right now.

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

The widest category gap is in agentic, where the averages are 88 for Claude Opus 5.5 and 63.7 for Gemini 4 Argon.

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

Claude Opus 5.5 currently has 53 sourced benchmark scores on BenchLM.

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

Gemini 4 Argon currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 5.5 vs GPT-6 Astra](/compare/claude-opus-5-5-vs-gpt-6-astra)
- [Gemini 4 Argon vs GPT-6 Astra](/compare/gemini-4-argon-vs-gpt-6-astra)
- [Claude Opus 5.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Gemini 4 Argon vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-4-argon)

## Explore More

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