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Claude Sonnet 4.5 vs Claude Haiku 4.5
A detailed comparison of Claude Sonnet 4.5 (Anthropic) and Claude Haiku 4.5 (Anthropic) across pricing, performance, and features.
Pricing Comparison
| Metric | Claude Sonnet 4.5 | Claude Haiku 4.5 | Difference |
|---|---|---|---|
| Input / 1M tokens | $3.00 | $0.80 | -73% |
| Output / 1M tokens | $15.00 | $4.00 | -73% |
| Context window | 200K | 200K | — |
| Max output | 16K | 8.192K | — |
Benchmark Comparison
| Benchmark | Claude Sonnet 4.5 | Claude Haiku 4.5 |
|---|---|---|
| MMLU-Pro | 84.5% | 69.4% |
| HumanEval | 93% | 88.1% |
| GPQA | 68.2% | — |
Capabilities
| Capability | Claude Sonnet 4.5 | Claude Haiku 4.5 |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✗ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
Claude Sonnet 4.5 Strengths
- ✓Well-tested and stable
- ✓Strong coding and analysis
Claude Sonnet 4.5 Weaknesses
- ✗Superseded by Sonnet 4.6
- ✗Same price as the newer model
Claude Haiku 4.5 Strengths
- ✓Very fast responses
- ✓Cheapest Anthropic option
- ✓Good for classification and extraction
Claude Haiku 4.5 Weaknesses
- ✗Weakest reasoning in the Claude family
- ✗Can struggle with nuanced instructions
Quick Verdict
Best value: Claude Haiku 4.5 is the more affordable option at $0.8/$4 per 1M tokens.
Higher benchmarks: Claude Sonnet 4.5 scores higher on average across available benchmarks (81.9% avg).
Choose Claude Haiku 4.5 if cost matters most. Choose Claude Sonnet 4.5 if you need the best possible quality for complex tasks.