# Claude Haiku 4.5 vs Claude Sonnet 5

> Side-by-side benchmark comparison for Claude Haiku 4.5 and Claude Sonnet 5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Sonnet 5 if you want the stronger benchmark profile. Claude Haiku 4.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Sonnet 5 leads overall 66.99 to 42.49.
- The clearest category separation is in agentic, where the averages are 21.9 for Claude Haiku 4.5 and 64.6 for Claude Sonnet 5.
- The biggest single benchmark swing is LiveCodeBench (Vals) in Coding, with scores of 41.2% and 82.4%.
- Claude Haiku 4.5 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Sonnet 5 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Haiku 4.5 | Claude Sonnet 5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Overall Score | 42.49 | 66.99 |
| Benchmarks Covered | 10 | 26 |
| Pricing (input/output) | $1.00 / $5.00 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Claude Sonnet 5
- Claude Haiku 4.5 public-lane score: 21.9 (Supported · #96/117)
- Claude Sonnet 5 public-lane score: 64.6 (Supported · #12/117)

| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| JobBench | 16.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 43.8% | 74.5% | Claude Sonnet 5 |
| Terminal-Bench 3.0 | Coming soon | 14.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 80.4% | Coming soon |
| BrowseComp | Coming soon | 84.7% | Coming soon |
| HLE w/ tools | Coming soon | 57.4% | Coming soon |
| OSWorld-Verified | Coming soon | 81.2% | Coming soon |
| ApprenticeBench | Coming soon | 16% | Coming soon |

### Coding

- Winner: Claude Sonnet 5
- Claude Haiku 4.5 public-lane score: 19.6 (Supported · #126/142)
- Claude Sonnet 5 public-lane score: 59.8 (Supported · #19/142)

| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 73.3% | 85.2% | Claude Sonnet 5 |
| VulcanBench v3 | 76.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 41.2% | 82.4% | Claude Sonnet 5 |
| SWE-bench (Vals) | 66.6% | 79.6% | Claude Sonnet 5 |
| SWE-bench Pro | Coming soon | 63.2% | Coming soon |
| SWE Multilingual | Coming soon | 78.3% | Coming soon |
| SWE Multimodal | Coming soon | 28.1% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 80.4% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 42.7% | Coming soon |
| cursorBench32 | Coming soon | 61.5% | Coming soon |
| VulcanBench CII v1 | Coming soon | 89.2% | Coming soon |
| cursorBench40 | Coming soon | 34.1% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Haiku 4.5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 78.7 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Not comparable
- Claude Haiku 4.5 public-lane score: Coming soon
- Claude Sonnet 5 public-lane score: 78.4 (#15/50)

| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 88.3% | Coming soon |
| CharXiv w/o tools | Coming soon | 77% | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Haiku 4.5 public-lane score: 34.7 (Estimated · #118/168)
- Claude Sonnet 5 public-lane score: 64.5 (Supported · #26/168)

| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 72.2% | 88.9% | Claude Sonnet 5 |
| MMLU-Pro (Vals) | 78.7% | 87.5% | Claude Sonnet 5 |
| HLE | Coming soon | 57.4% | Coming soon |
| HLE w/o tools | Coming soon | 43.2% | Coming soon |
| HLE-Verified | Coming soon | 31.0% | Coming soon |
| LABBench2 | Coming soon | 80.1% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Haiku 4.5 public-lane score: 28.8 (Unranked · 2 rankable rows)
- Claude Sonnet 5 public-lane score: Coming soon

| Benchmark | Claude Haiku 4.5 | Claude Sonnet 5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 5.903% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 2.083% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Haiku 4.5 or Claude Sonnet 5?

Claude Sonnet 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Haiku 4.5 and Claude Sonnet 5?

The widest category gap is in agentic, where the averages are 21.9 for Claude Haiku 4.5 and 64.6 for Claude Sonnet 5.

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

Claude Haiku 4.5 currently has 10 sourced benchmark scores on BenchLM.

### How many benchmarks does Claude Sonnet 5 cover on BenchLM?

Claude Sonnet 5 currently has 26 sourced benchmark scores on BenchLM.

## Related Comparisons

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

## Explore More

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