Claude 3.7 Sonnet Pro vs Claude 3.7 Sonnet Reasoning: which model should you choose?
We compared Claude 3.7 Sonnet Pro and Claude 3.7 Sonnet Reasoning on price, context window and 12 benchmarks. Claude 3.7 Sonnet Reasoning has the stronger average benchmark score; Claude 3.7 Sonnet Reasoning is cheaper on a blended 3:1 basis.
Claude 3.7 Sonnet Pro
Claude 3.7 Sonnet Pro is a frontier model from Anthropic. It offers a 128,000-token context window, costs $16.07 per million input tokens and $85.28 per million output tokens, and averages 83.3 across the index's benchmark suite.
- Input
- $16.07 / 1M
- Output
- $85.28 / 1M
- Context
- 128,000
- Avg score
- 83.3
- Open weights
- No
Claude 3.7 Sonnet Reasoning
Claude 3.7 Sonnet Reasoning is a frontier model from Anthropic. It offers a 128,000-token context window, costs $16.30 per million input tokens and $77.62 per million output tokens, and averages 83.7 across the index's benchmark suite.
- Input
- $16.30 / 1M
- Output
- $77.62 / 1M
- Context
- 128,000
- Avg score
- 83.7
- Open weights
- No
Specification comparison
| Spec | Claude 3.7 Sonnet Pro | Claude 3.7 Sonnet Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $16.07 | $16.30 | A |
| Output price / 1M | $85.28 | $77.62 | B |
| Context window | 128,000 | 128,000 | Tie |
| Max output | 8,192 | 128,000 | B |
| Average score | 83.3 | 83.7 | B |
| Arena Elo | 1446.8 | 1464.4 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Claude 3.7 Sonnet Pro wins 4, Claude 3.7 Sonnet Reasoning wins 8, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude 3.7 Sonnet Pro | Claude 3.7 Sonnet Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 85.7 | 86.4 | 0.7 | Claude 3.7 Sonnet Reasoning |
| GPQA Diamond | 80.6 | 81.3 | 0.7 | Claude 3.7 Sonnet Reasoning |
| SWE-bench Verified | 71.4 | 71.0 | 0.4 | Claude 3.7 Sonnet Pro |
| HumanEval | 90.0 | 89.2 | 0.8 | Claude 3.7 Sonnet Pro |
| MATH-500 | 89.2 | 90.3 | 1.1 | Claude 3.7 Sonnet Reasoning |
| AIME 2025 | 81.5 | 79.8 | 1.7 | Claude 3.7 Sonnet Pro |
| LiveCodeBench | 74.1 | 79.6 | 5.5 | Claude 3.7 Sonnet Reasoning |
| IFEval | 88.5 | 90.1 | 1.6 | Claude 3.7 Sonnet Reasoning |
| TruthfulQA | 86.0 | 86.2 | 0.2 | Claude 3.7 Sonnet Reasoning |
| HellaSwag | 89.7 | 90.4 | 0.7 | Claude 3.7 Sonnet Reasoning |
| MMMU | 79.7 | 76.5 | 3.2 | Claude 3.7 Sonnet Pro |
| Arena Elo | 1446.8 | 1464.4 | 17.6 | Claude 3.7 Sonnet Reasoning |
Price analysis
On a blended 3:1 input-to-output basis, Claude 3.7 Sonnet Pro costs about $33.37 per million tokens and Claude 3.7 Sonnet Reasoning costs about $31.63. Claude 3.7 Sonnet Reasoning is roughly 5% cheaper than Claude 3.7 Sonnet Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Both models list a 128,000-token context window. That is enough for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Pro wins 4, Claude 3.7 Sonnet Reasoning wins 8, and 0 are tied. On the index average, Claude 3.7 Sonnet Reasoning leads Claude 3.7 Sonnet Pro by 0.4 points (83.7 versus 83.3).
The price picture favours Claude 3.7 Sonnet Reasoning. The context picture is effectively a tie. 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 Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Claude 3.7 Sonnet Pro if
- You prefer Anthropic's tooling or already use it.
Choose Claude 3.7 Sonnet Reasoning 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 128,000-token output limit.
FAQ
Is Claude 3.7 Sonnet Pro better than Claude 3.7 Sonnet Reasoning?
On the index average, Claude 3.7 Sonnet Reasoning leads Claude 3.7 Sonnet Pro by 0.4 points (83.7 versus 83.3). The better choice depends on price, context and your task. Claude 3.7 Sonnet Pro wins 4 benchmarks, Claude 3.7 Sonnet Reasoning wins 8.
Which is cheaper, Claude 3.7 Sonnet Pro or Claude 3.7 Sonnet Reasoning?
Claude 3.7 Sonnet Reasoning is cheaper on a blended 3:1 basis at about $31.63 per million tokens, versus $33.37 for Claude 3.7 Sonnet Pro.
Which has the larger context window?
Both models list a 128,000-token context window.
Are these models open weights?
Claude 3.7 Sonnet Pro is proprietary; Claude 3.7 Sonnet Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with Claude 3.7 Sonnet Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.