Claude 3.7 Sonnet Turbo vs Claude Haiku 4.5 Reasoning: which model should you choose?
We compared Claude 3.7 Sonnet Turbo and Claude Haiku 4.5 Reasoning on price, context window and 12 benchmarks. Claude 3.7 Sonnet Turbo has the stronger average benchmark score; Claude 3.7 Sonnet Turbo is cheaper on a blended 3:1 basis.
Claude 3.7 Sonnet Turbo
Claude 3.7 Sonnet Turbo is a multimodal model from Anthropic. It offers a 200,000-token context window, costs $15.56 per million input tokens and $63.75 per million output tokens, and averages 82.3 across the index's benchmark suite.
- Input
- $15.56 / 1M
- Output
- $63.75 / 1M
- Context
- 200,000
- Avg score
- 82.3
- Open weights
- No
Claude Haiku 4.5 Reasoning
Claude Haiku 4.5 Reasoning is a multimodal model from Anthropic. It offers a 128,000-token context window, costs $15.11 per million input tokens and $70.05 per million output tokens, and averages 81.4 across the index's benchmark suite.
- Input
- $15.11 / 1M
- Output
- $70.05 / 1M
- Context
- 128,000
- Avg score
- 81.4
- Open weights
- No
Specification comparison
| Spec | Claude 3.7 Sonnet Turbo | Claude Haiku 4.5 Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $15.56 | $15.11 | B |
| Output price / 1M | $63.75 | $70.05 | A |
| Context window | 200,000 | 128,000 | A |
| Max output | 16,384 | 128,000 | B |
| Average score | 82.3 | 81.4 | A |
| Arena Elo | 1458.8 | 1444.2 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude 3.7 Sonnet Turbo wins 9, Claude Haiku 4.5 Reasoning wins 3, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude 3.7 Sonnet Turbo | Claude Haiku 4.5 Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 82.1 | 83.4 | 1.3 | Claude Haiku 4.5 Reasoning |
| GPQA Diamond | 79.7 | 74.6 | 5.1 | Claude 3.7 Sonnet Turbo |
| SWE-bench Verified | 73.9 | 69.6 | 4.3 | Claude 3.7 Sonnet Turbo |
| HumanEval | 87.6 | 88.7 | 1.1 | Claude Haiku 4.5 Reasoning |
| MATH-500 | 86.8 | 85.8 | 1.0 | Claude 3.7 Sonnet Turbo |
| AIME 2025 | 81.4 | 79.0 | 2.4 | Claude 3.7 Sonnet Turbo |
| LiveCodeBench | 75.5 | 73.8 | 1.7 | Claude 3.7 Sonnet Turbo |
| IFEval | 87.4 | 89.9 | 2.5 | Claude Haiku 4.5 Reasoning |
| TruthfulQA | 82.6 | 82.5 | 0.1 | Claude 3.7 Sonnet Turbo |
| HellaSwag | 91.0 | 90.9 | 0.1 | Claude 3.7 Sonnet Turbo |
| MMMU | 77.6 | 76.7 | 0.9 | Claude 3.7 Sonnet Turbo |
| Arena Elo | 1458.8 | 1444.2 | 14.6 | Claude 3.7 Sonnet Turbo |
Price analysis
On a blended 3:1 input-to-output basis, Claude 3.7 Sonnet Turbo costs about $27.61 per million tokens and Claude Haiku 4.5 Reasoning costs about $28.84. Claude 3.7 Sonnet Turbo is roughly 4% cheaper than Claude Haiku 4.5 Reasoning. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Claude 3.7 Sonnet Turbo has the larger context window at 200,000 tokens, compared with 128,000 for Claude Haiku 4.5 Reasoning. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Turbo wins 9, Claude Haiku 4.5 Reasoning wins 3, and 0 are tied. On the index average, Claude 3.7 Sonnet Turbo leads Claude Haiku 4.5 Reasoning by 0.9 points (82.3 versus 81.4).
The price picture favours Claude 3.7 Sonnet Turbo. The context picture favours Claude 3.7 Sonnet Turbo. Those two dimensions often matter more than a few benchmark points once a model is good enough for the task.
If you need a single default, start with Claude 3.7 Sonnet Turbo for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Claude 3.7 Sonnet Turbo if
- You want the higher average benchmark score in this index.
- Unit cost matters and you want the cheaper blended price.
- You need the larger 200,000-token context window.
Choose Claude Haiku 4.5 Reasoning if
- You need the larger 128,000-token output limit.
FAQ
Is Claude 3.7 Sonnet Turbo better than Claude Haiku 4.5 Reasoning?
On the index average, Claude 3.7 Sonnet Turbo leads Claude Haiku 4.5 Reasoning by 0.9 points (82.3 versus 81.4). The better choice depends on price, context and your task. Claude 3.7 Sonnet Turbo wins 9 benchmarks, Claude Haiku 4.5 Reasoning wins 3.
Which is cheaper, Claude 3.7 Sonnet Turbo or Claude Haiku 4.5 Reasoning?
Claude 3.7 Sonnet Turbo is cheaper on a blended 3:1 basis at about $27.61 per million tokens, versus $28.84 for Claude Haiku 4.5 Reasoning.
Which has the larger context window?
Claude 3.7 Sonnet Turbo has the larger context window at 200,000 tokens. Claude Haiku 4.5 Reasoning has 128,000 tokens.
Are these models open weights?
Claude 3.7 Sonnet Turbo is proprietary; Claude Haiku 4.5 Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with Claude 3.7 Sonnet Turbo for quality-sensitive work, and check whether its price holds at your expected volume before committing.