Claude 3.7 Sonnet Reasoning vs DeepSeek-V3.2: which model should you choose?
We compared Claude 3.7 Sonnet Reasoning and DeepSeek-V3.2 on price, context window and 12 benchmarks. DeepSeek-V3.2 has the stronger average benchmark score; DeepSeek-V3.2 is cheaper on a blended 3:1 basis.
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
DeepSeek-V3.2
DeepSeek-V3.2 is a frontier model from DeepSeek. It offers a 1,000,000-token context window, costs $5.88 per million input tokens and $24.70 per million output tokens, and averages 84.0 across the index's benchmark suite.
- Input
- $5.88 / 1M
- Output
- $24.70 / 1M
- Context
- 1,000,000
- Avg score
- 84.0
- Open weights
- Yes
Specification comparison
| Spec | Claude 3.7 Sonnet Reasoning | DeepSeek-V3.2 | Edge |
|---|---|---|---|
| Input price / 1M | $16.30 | $5.88 | B |
| Output price / 1M | $77.62 | $24.70 | B |
| Context window | 128,000 | 1,000,000 | B |
| Max output | 128,000 | 8,192 | A |
| Average score | 83.7 | 84.0 | B |
| Arena Elo | 1464.4 | 1455.6 | A |
| Open weights | No | Yes | B |
Benchmark comparison
Claude 3.7 Sonnet Reasoning wins 7, DeepSeek-V3.2 wins 5, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude 3.7 Sonnet Reasoning | DeepSeek-V3.2 | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 86.4 | 86.9 | 0.5 | DeepSeek-V3.2 |
| GPQA Diamond | 81.3 | 79.7 | 1.6 | Claude 3.7 Sonnet Reasoning |
| SWE-bench Verified | 71.0 | 74.4 | 3.4 | DeepSeek-V3.2 |
| HumanEval | 89.2 | 89.7 | 0.5 | DeepSeek-V3.2 |
| MATH-500 | 90.3 | 89.7 | 0.6 | Claude 3.7 Sonnet Reasoning |
| AIME 2025 | 79.8 | 79.6 | 0.2 | Claude 3.7 Sonnet Reasoning |
| LiveCodeBench | 79.6 | 80.4 | 0.8 | DeepSeek-V3.2 |
| IFEval | 90.1 | 89.4 | 0.7 | Claude 3.7 Sonnet Reasoning |
| TruthfulQA | 86.2 | 84.5 | 1.7 | Claude 3.7 Sonnet Reasoning |
| HellaSwag | 90.4 | 90.2 | 0.2 | Claude 3.7 Sonnet Reasoning |
| MMMU | 76.5 | 79.9 | 3.4 | DeepSeek-V3.2 |
| Arena Elo | 1464.4 | 1455.6 | 8.8 | Claude 3.7 Sonnet Reasoning |
Price analysis
On a blended 3:1 input-to-output basis, Claude 3.7 Sonnet Reasoning costs about $31.63 per million tokens and DeepSeek-V3.2 costs about $10.59. DeepSeek-V3.2 is roughly 67% cheaper than Claude 3.7 Sonnet Reasoning. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
DeepSeek-V3.2 has the larger context window at 1,000,000 tokens, compared with 128,000 for Claude 3.7 Sonnet Reasoning. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Reasoning wins 7, DeepSeek-V3.2 wins 5, and 0 are tied. On the index average, DeepSeek-V3.2 leads Claude 3.7 Sonnet Reasoning by 0.3 points (84.0 versus 83.7).
The price picture favours DeepSeek-V3.2. The context picture favours DeepSeek-V3.2. 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 DeepSeek-V3.2 for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Claude 3.7 Sonnet Reasoning if
- You need the larger 128,000-token output limit.
Choose DeepSeek-V3.2 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 1,000,000-token context window.
- You need open weights for self-hosting or fine-tuning.
FAQ
Is Claude 3.7 Sonnet Reasoning better than DeepSeek-V3.2?
On the index average, DeepSeek-V3.2 leads Claude 3.7 Sonnet Reasoning by 0.3 points (84.0 versus 83.7). The better choice depends on price, context and your task. Claude 3.7 Sonnet Reasoning wins 7 benchmarks, DeepSeek-V3.2 wins 5.
Which is cheaper, Claude 3.7 Sonnet Reasoning or DeepSeek-V3.2?
DeepSeek-V3.2 is cheaper on a blended 3:1 basis at about $10.59 per million tokens, versus $31.63 for Claude 3.7 Sonnet Reasoning.
Which has the larger context window?
DeepSeek-V3.2 has the larger context window at 1,000,000 tokens. Claude 3.7 Sonnet Reasoning has 128,000 tokens.
Are these models open weights?
Claude 3.7 Sonnet Reasoning is proprietary; DeepSeek-V3.2 is open weights.
Which should I choose for production?
If you need a single default, start with DeepSeek-V3.2 for quality-sensitive work, and check whether its price holds at your expected volume before committing.