Claude 3.7 Sonnet Pro vs o3 Turbo: which model should you choose?
We compared Claude 3.7 Sonnet Pro and o3 Turbo on price, context window and 12 benchmarks. o3 Turbo has the stronger average benchmark score; Claude 3.7 Sonnet Pro 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
o3 Turbo
o3 Turbo is a frontier model from OpenAI. It offers a 200,000-token context window, costs $16.63 per million input tokens and $83.71 per million output tokens, and averages 83.4 across the index's benchmark suite.
- Input
- $16.63 / 1M
- Output
- $83.71 / 1M
- Context
- 200,000
- Avg score
- 83.4
- Open weights
- No
Specification comparison
| Spec | Claude 3.7 Sonnet Pro | o3 Turbo | Edge |
|---|---|---|---|
| Input price / 1M | $16.07 | $16.63 | A |
| Output price / 1M | $85.28 | $83.71 | B |
| Context window | 128,000 | 200,000 | B |
| Max output | 8,192 | 4,096 | A |
| Average score | 83.3 | 83.4 | B |
| Arena Elo | 1446.8 | 1456.2 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Claude 3.7 Sonnet Pro wins 5, o3 Turbo wins 6, and 1 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude 3.7 Sonnet Pro | o3 Turbo | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 85.7 | 82.7 | 3.0 | Claude 3.7 Sonnet Pro |
| GPQA Diamond | 80.6 | 77.7 | 2.9 | Claude 3.7 Sonnet Pro |
| SWE-bench Verified | 71.4 | 70.7 | 0.7 | Claude 3.7 Sonnet Pro |
| HumanEval | 90.0 | 87.4 | 2.6 | Claude 3.7 Sonnet Pro |
| MATH-500 | 89.2 | 90.6 | 1.4 | o3 Turbo |
| AIME 2025 | 81.5 | 83.0 | 1.5 | o3 Turbo |
| LiveCodeBench | 74.1 | 80.7 | 6.6 | o3 Turbo |
| IFEval | 88.5 | 89.1 | 0.6 | o3 Turbo |
| TruthfulQA | 86.0 | 83.6 | 2.4 | Claude 3.7 Sonnet Pro |
| HellaSwag | 89.7 | 91.8 | 2.1 | o3 Turbo |
| MMMU | 79.7 | 79.7 | 0.0 | Tie |
| Arena Elo | 1446.8 | 1456.2 | 9.4 | o3 Turbo |
Price analysis
On a blended 3:1 input-to-output basis, Claude 3.7 Sonnet Pro costs about $33.37 per million tokens and o3 Turbo costs about $33.40. Claude 3.7 Sonnet Pro is roughly 0% cheaper than o3 Turbo. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
o3 Turbo has the larger context window at 200,000 tokens, compared with 128,000 for Claude 3.7 Sonnet Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Pro wins 5, o3 Turbo wins 6, and 1 are tied. On the index average, o3 Turbo leads Claude 3.7 Sonnet Pro by 0.1 points (83.4 versus 83.3).
The price picture favours Claude 3.7 Sonnet Pro. The context picture favours o3 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 o3 Turbo for quality-sensitive work and Claude 3.7 Sonnet Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Claude 3.7 Sonnet Pro if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 8,192-token output limit.
Choose o3 Turbo if
- You want the higher average benchmark score in this index.
- You need the larger 200,000-token context window.
FAQ
Is Claude 3.7 Sonnet Pro better than o3 Turbo?
On the index average, o3 Turbo leads Claude 3.7 Sonnet Pro by 0.1 points (83.4 versus 83.3). The better choice depends on price, context and your task. Claude 3.7 Sonnet Pro wins 5 benchmarks, o3 Turbo wins 6.
Which is cheaper, Claude 3.7 Sonnet Pro or o3 Turbo?
Claude 3.7 Sonnet Pro is cheaper on a blended 3:1 basis at about $33.37 per million tokens, versus $33.40 for o3 Turbo.
Which has the larger context window?
o3 Turbo has the larger context window at 200,000 tokens. Claude 3.7 Sonnet Pro has 128,000 tokens.
Are these models open weights?
Claude 3.7 Sonnet Pro is proprietary; o3 Turbo is proprietary.
Which should I choose for production?
If you need a single default, start with o3 Turbo for quality-sensitive work and Claude 3.7 Sonnet Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.