# Claude Haiku 4.5 vs GPT-5.4 nano

> Side-by-side benchmark comparison for Claude Haiku 4.5 and GPT-5.4 nano across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-haiku-4-5-vs-gpt-5-4-nano
- Last updated: September 10, 2026

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

## Quick Verdict

Pick GPT-5.4 nano 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

- GPT-5.4 nano leads overall 59.57 to 52.79.
- The clearest category separation is in mathematics, where the averages are 28.9 for Claude Haiku 4.5 and 43.9 for GPT-5.4 nano.
- The biggest single benchmark swing is LiveCodeBench (Vals) in Coding, with scores of 41.2% and 84.0%.
- GPT-5.4 nano is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.4 nano also has the larger context window at 400K.

## Model Snapshot

| Property | Claude Haiku 4.5 | GPT-5.4 nano |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 400K |
| Overall Score | 52.79 | 59.57 |
| Benchmarks Covered | 10 | 18 |
| Pricing (input/output) | $1.00 / $5.00 | $0.20 / $1.25 |

## Category Breakdown

### Agentic

- Winner: GPT-5.4 nano
- Claude Haiku 4.5 public-lane score: 27 (Supported · #142/152)
- GPT-5.4 nano public-lane score: 34.6 (Supported · #133/152)

| Benchmark | Claude Haiku 4.5 | GPT-5.4 nano | Winner |
|-----------|-----------|-----------|--------|
| JobBench | 16.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 43.8% | 41.6% | Claude Haiku 4.5 |
| Terminal-Bench 2.0 | Coming soon | 46.3% | Coming soon |
| OSWorld-Verified | Coming soon | 39% | Coming soon |
| MCP Atlas | Coming soon | 56.1% | Coming soon |
| Toolathlon | Coming soon | 35.5% | Coming soon |
| τ²-bench results | Coming soon | 92.5% | Coming soon |

### Coding

- Winner: GPT-5.4 nano
- Claude Haiku 4.5 public-lane score: 27.2 (Supported · #144/151)
- GPT-5.4 nano public-lane score: 37.1 (Supported · #126/151)

| Benchmark | Claude Haiku 4.5 | GPT-5.4 nano | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 73.3% | Coming soon | Coming soon |
| VulcanBench v3 | 76.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 41.2% | 84.0% | GPT-5.4 nano |
| SWE-bench (Vals) | 66.6% | 69.8% | GPT-5.4 nano |
| Vibe Code Bench | Coming soon | 26.10% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- GPT-5.4 nano public-lane score: 23.8 (#45/48)

| Benchmark | Claude Haiku 4.5 | GPT-5.4 nano | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 66.1% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 69.5% | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- GPT-5.4 nano public-lane score: 73.7 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 44.2 (Estimated · #115/183)
- GPT-5.4 nano public-lane score: 47.4 (Supported · #97/183)

| Benchmark | Claude Haiku 4.5 | GPT-5.4 nano | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 72.2% | 77.5% | GPT-5.4 nano |
| MMLU-Pro (Vals) | 78.7% | 77.2% | Claude Haiku 4.5 |
| GPQA | Coming soon | 82.8% | Coming soon |
| HLE | Coming soon | 37.7% | Coming soon |
| HLE w/o tools | Coming soon | 24.3% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: Coming soon
- GPT-5.4 nano public-lane score: 93.2 (#9/123)

### Mathematics

- Winner: Coming soon
- Claude Haiku 4.5 public-lane score: 28.9 (Unranked · 2 rankable rows)
- GPT-5.4 nano public-lane score: 43.9 (Unranked · 2 rankable rows)

| Benchmark | Claude Haiku 4.5 | GPT-5.4 nano | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 5.903% | 25.860% | GPT-5.4 nano |
| FrontierMath v2 (Tier 4) | 2.083% | 6.250% | GPT-5.4 nano |

## FAQ

### Which is better overall, Claude Haiku 4.5 or GPT-5.4 nano?

GPT-5.4 nano is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Haiku 4.5 and GPT-5.4 nano?

The widest category gap is in mathematics, where the averages are 28.9 for Claude Haiku 4.5 and 43.9 for GPT-5.4 nano.

### 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 GPT-5.4 nano cover on BenchLM?

GPT-5.4 nano currently has 18 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)
- [GPT-5.4 nano vs Claude Haiku 4.5 Thinking](/compare/claude-haiku-4-5-thinking-vs-gpt-5-4-nano)
- [Claude Haiku 4.5 vs GPT-5.4](/compare/claude-haiku-4-5-vs-gpt-5-4)
- [GPT-5.4 nano vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-nano)

## Explore More

- [Claude Haiku 4.5 profile](/models/claude-haiku-4-5)
- [GPT-5.4 nano profile](/models/gpt-5-4-nano)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)