# Claude 3.5 Haiku vs Claude Sonnet 4.5

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

- Canonical page: https://benchlm.ai/compare/claude-3-5-haiku-vs-claude-sonnet-4-5
- Last updated: October 14, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude 3.5 Haiku and Claude Sonnet 4.5 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.

## Model Snapshot

| Property | Claude 3.5 Haiku | Claude Sonnet 4.5 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 200K | 200K |
| Independent public score (not head-to-head) | null | 48.29 |
| Benchmarks Covered | 10 | 12 |
| Pricing (input/output) | N/A | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 34 (Estimated · #78/124)

| Benchmark | Claude 3.5 Haiku | 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: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| HumanEval | 88.1% | Coming soon | Coming soon |
| SWE-bench Verified | 40.6% | 77.2% | Claude Sonnet 4.5 |
| Terminal-Bench 2.0 | Coming soon | 50.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 22.9 (Unranked · 1 rankable row)

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| BBH | 86.6% | Coming soon | Coming soon |
| DROP | 83.1% | Coming soon | Coming soon |
| ARC-AGI-2 | Coming soon | 13.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 41.6% | 83.4% | Claude Sonnet 4.5 |
| MMLU-Pro | 65% | Coming soon | Coming soon |
| MMLU | 80.3% | Coming soon | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| MGSM | 85.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: Coming soon

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 85.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude 3.5 Haiku public-lane score: Coming soon
- Claude Sonnet 4.5 public-lane score: 36.4 (Unranked · 2 rankable rows)

| Benchmark | Claude 3.5 Haiku | Claude Sonnet 4.5 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 5.3% | Coming soon | Coming soon |
| AIME 2025 | Coming soon | 87% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 23.860% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 2.439% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude 3.5 Haiku and Claude Sonnet 4.5?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude 3.5 Haiku vs Claude Sonnet 4.5 Thinking](/compare/claude-3-5-haiku-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 Haiku vs Claude Opus 5.5](/compare/claude-3-5-haiku-vs-claude-opus-5-5)
- [Claude Sonnet 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-4-5)

## Explore More

- [Claude 3.5 Haiku profile](/models/claude-3-5-haiku)
- [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)