# Claude 3.5 Haiku vs GPT-4.5

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

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

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

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

## Summary

- GPT-4.5 leads overall 69 to 47.
- The biggest single benchmark swing is GPQA in Knowledge, with scores of 41.6% and 69.5%.
- Claude 3.5 Haiku also has the larger context window at 200K.

## Model Snapshot

| Property | Claude 3.5 Haiku | GPT-4.5 |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 200K | 128K |
| Overall Score | null | null |
| Benchmarks Covered | 10 | 6 |
| Pricing (input/output) | N/A | $75.00 / $150.00 |

## Category Breakdown

### Coding

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

| Benchmark | Claude 3.5 Haiku | GPT-4.5 | Winner |
|-----------|-----------|-----------|--------|
| HumanEval | 88.1% | 88.6% | GPT-4.5 |
| SWE-bench Verified | 40.6% | Coming soon | Coming soon |

### Reasoning

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

| Benchmark | Claude 3.5 Haiku | GPT-4.5 | Winner |
|-----------|-----------|-----------|--------|
| BBH | 86.6% | Coming soon | Coming soon |
| DROP | 83.1% | 83.4% | GPT-4.5 |

### Knowledge

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

| Benchmark | Claude 3.5 Haiku | GPT-4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 41.6% | 69.5% | GPT-4.5 |
| MMLU-Pro | 65% | Coming soon | Coming soon |
| MMLU | 80.3% | 90.8% | GPT-4.5 |
| SimpleQA | Coming soon | 62.5% | Coming soon |

### Multilingual

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

| Benchmark | Claude 3.5 Haiku | GPT-4.5 | Winner |
|-----------|-----------|-----------|--------|
| MGSM | 85.6% | 86.9% | GPT-4.5 |

### Instruction Following

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

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

### Mathematics

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

| Benchmark | Claude 3.5 Haiku | GPT-4.5 | Winner |
|-----------|-----------|-----------|--------|
| AIME 2024 | 5.3% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude 3.5 Haiku or GPT-4.5?

GPT-4.5 is ahead overall on BenchLM right now.

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

Claude 3.5 Haiku currently has 10 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-4.5 cover on BenchLM?

GPT-4.5 currently has 6 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude 3.5 Haiku vs Claude Opus 5.5](/compare/claude-3-5-haiku-vs-claude-opus-5-5)
- [GPT-4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-4-5)
- [Claude 3.5 Haiku vs GPT-6.1 Sol](/compare/claude-3-5-haiku-vs-gpt-6-1-sol)
- [GPT-4.5 vs GPT-6.1 Sol](/compare/gpt-4-5-vs-gpt-6-1-sol)

## Explore More

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