# Claude 3.5 Sonnet vs Claude Sonnet 4.5

> Side-by-side benchmark comparison for Claude 3.5 Sonnet and Claude Sonnet 4.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-3-5-sonnet-vs-claude-sonnet-4-5
- Last updated: September 29, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Sonnet 4.5 if you want the stronger benchmark profile. Claude 3.5 Sonnet only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Sonnet 4.5 leads overall 47.85 to 30.
- The clearest category separation is in mathematics, where the averages are 25.6 for Claude 3.5 Sonnet and 34.6 for Claude Sonnet 4.5.
- The biggest single benchmark swing is SWE-bench Verified in Coding, with scores of 49% and 77.2%.

## Model Snapshot

| Property | Claude 3.5 Sonnet | Claude Sonnet 4.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 200K | 200K |
| Overall Score | 30 | 47.85 |
| Benchmarks Covered | 4 | 11 |
| Pricing (input/output) | $3.00 / $15.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude 3.5 Sonnet public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 34.6 (Estimated · #67/117)

| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | Coming soon | 50% | Coming soon |
| OSWorld-Verified | Coming soon | 61.4% | Coming soon |
| VITA-Bench | Coming soon | 17.0% | Coming soon |
| Gert Labs | Coming soon | 48.51% | Coming soon |
| JobBench | Coming soon | 27.7% | Coming soon |

### Coding

- Winner: Not comparable
- Claude 3.5 Sonnet public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 49% | 77.2% | Claude Sonnet 4.5 |

### Reasoning

- Winner: Not comparable
- Claude 3.5 Sonnet public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 19.2 (Unranked · 1 rankable row)

| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 13.6% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude 3.5 Sonnet public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 59.4% | 83.4% | Claude Sonnet 4.5 |

### Mathematics

- Winner: Not comparable
- Claude 3.5 Sonnet public-lane score: 25.6 (Unranked · 2 rankable rows)
- Claude Sonnet 4.5 public-lane score: 34.6 (Unranked · 2 rankable rows)

| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 2.069% | 13.495% | Claude Sonnet 4.5 |
| FrontierMath v2 (Tier 4) | 0.000% | 4.167% | Claude Sonnet 4.5 |
| AIME 2025 | Coming soon | 87% | Coming soon |

## FAQ

### Which is better overall, Claude 3.5 Sonnet or Claude Sonnet 4.5?

Claude Sonnet 4.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude 3.5 Sonnet and Claude Sonnet 4.5?

The widest category gap is in mathematics, where the averages are 25.6 for Claude 3.5 Sonnet and 34.6 for Claude Sonnet 4.5.

### How many benchmarks does Claude 3.5 Sonnet cover on BenchLM?

Claude 3.5 Sonnet currently has 4 sourced benchmark scores on BenchLM.

### How many benchmarks does Claude Sonnet 4.5 cover on BenchLM?

Claude Sonnet 4.5 currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude 3.5 Sonnet vs Claude Sonnet 4.5 Thinking](/compare/claude-3-5-sonnet-vs-claude-sonnet-4-5-thinking)
- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [Claude 3.5 Sonnet vs GPT-6 Astra](/compare/claude-3-5-sonnet-vs-gpt-6-astra)
- [Claude Sonnet 4.5 vs GPT-6 Astra](/compare/claude-sonnet-4-5-vs-gpt-6-astra)

## Explore More

- [Claude 3.5 Sonnet profile](/models/claude-3-5-sonnet)
- [Claude Sonnet 4.5 profile](/models/claude-sonnet-4-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)