# Claude Sonnet 4.6 vs Gemini 3.8 Flash

> Side-by-side benchmark comparison for Claude Sonnet 4.6 and Gemini 3.8 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-6-vs-gemini-3-8-flash
- Last updated: October 17, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Gemini 3.8 Flash if you want the stronger benchmark profile. Claude Sonnet 4.6 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Gemini 3.8 Flash leads overall 69.25 to 55.89.
- The clearest category separation is in multimodal & grounded, where the averages are 58.7 for Claude Sonnet 4.6 and 87.3 for Gemini 3.8 Flash.
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 8.3% and 59.0%.
- Gemini 3.8 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Gemini 3.8 Flash also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Sonnet 4.6 | Gemini 3.8 Flash |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Overall Score | 55.89 | 69.25 |
| Benchmarks Covered | 28 | 31 |
| Pricing (input/output) | $3.00 / $15.00 | $0.75 / $3.75 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.8 Flash
- Claude Sonnet 4.6 public-lane score: 46.3 (Supported · #55/128)
- Gemini 3.8 Flash public-lane score: 65.9 (Supported · #16/128)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.1% | Coming soon | Coming soon |
| OSWorld-Verified | 72.1% | Coming soon | Coming soon |
| Claw-Eval | 67.8% | Coming soon | Coming soon |
| CyberGym | 65.2% | Coming soon | Coming soon |
| Gert Labs | 62.92% | Coming soon | Coming soon |
| OSWorld 2.0 | 8.3% | 59.0% | Gemini 3.8 Flash |
| JobBench | 36.9% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 57.3% | 81.3% | Gemini 3.8 Flash |
| ApprenticeBench | 2% | 24% | Gemini 3.8 Flash |
| MazeBench | 0% | 4% | Gemini 3.8 Flash |
| Finance Agent v2 | Coming soon | 61.4% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 89.4% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 19.10% | Coming soon |
| Hermes Index | Coming soon | 38.1% | Coming soon |
| Hermes Bench | Coming soon | 62.2% | Coming soon |

### Coding

- Winner: Gemini 3.8 Flash
- Claude Sonnet 4.6 public-lane score: 44.7 (Supported · #54/150)
- Gemini 3.8 Flash public-lane score: 61 (Supported · #17/150)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 79.6% | Coming soon | Coming soon |
| SWE-Rebench | 60.7% | Coming soon | Coming soon |
| React Native Evals | 80.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 59.1% | Coming soon | Coming soon |
| Vibe Code Bench | 51.48% | Coming soon | Coming soon |
| cursorBench31 | 48.8% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 24.3% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.1% | 89.5% | Gemini 3.8 Flash |
| SWE-bench (Vals) | 77.4% | 80.0% | Gemini 3.8 Flash |
| DeepSWE | Coming soon | 73.8% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 89.4% | Coming soon |
| CursorBench 3.2 | Coming soon | 69.2% | Coming soon |
| FrontierSWE v2 | Coming soon | 19.6% | Coming soon |
| CursorBench 4.0 | Coming soon | 39.6% | Coming soon |
| Bug Hunt Bench | Coming soon | 18.0 fixes | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 4.6 public-lane score: 62.8 (Unranked · 4 rankable rows)
- Gemini 3.8 Flash public-lane score: 74.3 (#17/28)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 58.3% | 89.2% | Gemini 3.8 Flash |
| ARC-AGI-1 | 86.00% | 98.50% | Gemini 3.8 Flash |
| ARC-AGI-3 | Coming soon | 10.4% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Sonnet 4.6 public-lane score: 58.7 (#45/54)
- Gemini 3.8 Flash public-lane score: 87.3 (#9/54)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 77.4% | Coming soon | Coming soon |
| CharXiv w/o tools | Coming soon | 86.2% | Coming soon |
| LVBench | Coming soon | 87.1% | Coming soon |

### Knowledge

- Winner: Gemini 3.8 Flash
- Claude Sonnet 4.6 public-lane score: 55.4 (Supported · #58/184)
- Gemini 3.8 Flash public-lane score: 73.5 (Supported · #13/184)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 89.9% | Coming soon | Coming soon |
| SuperGPQA | 95% | Coming soon | Coming soon |
| MMLU-Pro | 79.2% | Coming soon | Coming soon |
| HLE | 49% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 85.6% | 94.4% | Gemini 3.8 Flash |
| MMLU-Pro (Vals) | 87.3% | 90.2% | Gemini 3.8 Flash |
| HLE-Verified | Coming soon | 54.9% | Coming soon |
| LABBench2 | Coming soon | 86.2% | Coming soon |
| BioMysteryBench (human-solvable) | Coming soon | 88.8% | Coming soon |
| BioMysteryBench (human-difficult) | Coming soon | 56.5% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Sonnet 4.6 public-lane score: 48 (#99/148)
- Gemini 3.8 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 5.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Sonnet 4.6 public-lane score: Coming soon
- Gemini 3.8 Flash public-lane score: 69.7 (Unranked · 2 rankable rows)

| Benchmark | Claude Sonnet 4.6 | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 68.421% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 21.951% | Coming soon |

## FAQ

### Which is better overall, Claude Sonnet 4.6 or Gemini 3.8 Flash?

Gemini 3.8 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 4.6 and Gemini 3.8 Flash?

The widest category gap is in multimodal & grounded, where the averages are 58.7 for Claude Sonnet 4.6 and 87.3 for Gemini 3.8 Flash.

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

Claude Sonnet 4.6 currently has 28 sourced benchmark scores on BenchLM.

### How many benchmarks does Gemini 3.8 Flash cover on BenchLM?

Gemini 3.8 Flash currently has 31 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.6 vs Gemini 3.8 Flash Cyber](/compare/claude-sonnet-4-6-vs-gemini-3-8-flash-cyber)
- [Gemini 3.8 Flash vs Gemini 3.8 Flash Cyber](/compare/gemini-3-8-flash-vs-gemini-3-8-flash-cyber)
- [Claude Sonnet 4.6 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-4-6)
- [Gemini 3.8 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-8-flash)

## Explore More

- [Claude Sonnet 4.6 profile](/models/claude-sonnet-4-6)
- [Gemini 3.8 Flash profile](/models/gemini-3-8-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)