Claude 3.7 Sonnet Turbo vs Claude Haiku 4.5 Pro: which model should you choose?
We compared Claude 3.7 Sonnet Turbo and Claude Haiku 4.5 Pro 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 Pro
Claude Haiku 4.5 Pro is a multimodal model from Anthropic. It offers a 1,000,000-token context window, costs $15.07 per million input tokens and $73.96 per million output tokens, and averages 80.8 across the index's benchmark suite.
- Input
- $15.07 / 1M
- Output
- $73.96 / 1M
- Context
- 1,000,000
- Avg score
- 80.8
- Open weights
- No
Specification comparison
| Spec | Claude 3.7 Sonnet Turbo | Claude Haiku 4.5 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $15.56 | $15.07 | B |
| Output price / 1M | $63.75 | $73.96 | A |
| Context window | 200,000 | 1,000,000 | B |
| Max output | 16,384 | 8,192 | A |
| Average score | 82.3 | 80.8 | A |
| Arena Elo | 1458.8 | 1436.2 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude 3.7 Sonnet Turbo wins 10, Claude Haiku 4.5 Pro wins 2, 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 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 82.1 | 81.5 | 0.6 | Claude 3.7 Sonnet Turbo |
| GPQA Diamond | 79.7 | 75.7 | 4.0 | Claude 3.7 Sonnet Turbo |
| SWE-bench Verified | 73.9 | 70.4 | 3.5 | Claude 3.7 Sonnet Turbo |
| HumanEval | 87.6 | 86.0 | 1.6 | Claude 3.7 Sonnet Turbo |
| MATH-500 | 86.8 | 83.7 | 3.1 | Claude 3.7 Sonnet Turbo |
| AIME 2025 | 81.4 | 80.1 | 1.3 | Claude 3.7 Sonnet Turbo |
| LiveCodeBench | 75.5 | 72.4 | 3.1 | Claude 3.7 Sonnet Turbo |
| IFEval | 87.4 | 90.1 | 2.7 | Claude Haiku 4.5 Pro |
| TruthfulQA | 82.6 | 84.1 | 1.5 | Claude Haiku 4.5 Pro |
| HellaSwag | 91.0 | 89.3 | 1.7 | Claude 3.7 Sonnet Turbo |
| MMMU | 77.6 | 75.3 | 2.3 | Claude 3.7 Sonnet Turbo |
| Arena Elo | 1458.8 | 1436.2 | 22.6 | 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 Pro costs about $29.79. Claude 3.7 Sonnet Turbo is roughly 7% cheaper than Claude Haiku 4.5 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Claude Haiku 4.5 Pro has the larger context window at 1,000,000 tokens, compared with 200,000 for Claude 3.7 Sonnet Turbo. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Turbo wins 10, Claude Haiku 4.5 Pro wins 2, and 0 are tied. On the index average, Claude 3.7 Sonnet Turbo leads Claude Haiku 4.5 Pro by 1.5 points (82.3 versus 80.8).
The price picture favours Claude 3.7 Sonnet Turbo. The context picture favours Claude Haiku 4.5 Pro. 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 16,384-token output limit.
- The workload needs multi-step reasoning.
Choose Claude Haiku 4.5 Pro if
- You need the larger 1,000,000-token context window.
FAQ
Is Claude 3.7 Sonnet Turbo better than Claude Haiku 4.5 Pro?
On the index average, Claude 3.7 Sonnet Turbo leads Claude Haiku 4.5 Pro by 1.5 points (82.3 versus 80.8). The better choice depends on price, context and your task. Claude 3.7 Sonnet Turbo wins 10 benchmarks, Claude Haiku 4.5 Pro wins 2.
Which is cheaper, Claude 3.7 Sonnet Turbo or Claude Haiku 4.5 Pro?
Claude 3.7 Sonnet Turbo is cheaper on a blended 3:1 basis at about $27.61 per million tokens, versus $29.79 for Claude Haiku 4.5 Pro.
Which has the larger context window?
Claude Haiku 4.5 Pro has the larger context window at 1,000,000 tokens. Claude 3.7 Sonnet Turbo has 200,000 tokens.
Are these models open weights?
Claude 3.7 Sonnet Turbo is proprietary; Claude Haiku 4.5 Pro 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.