Claude 3.7 Sonnet Turbo vs Gemini 3 Flash: which model should you choose?
We compared Claude 3.7 Sonnet Turbo and Gemini 3 Flash on price, context window and 12 benchmarks. Gemini 3 Flash 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
Gemini 3 Flash
Gemini 3 Flash is a multimodal model from Google DeepMind. It offers a 128,000-token context window, costs $15.67 per million input tokens and $70.15 per million output tokens, and averages 83.6 across the index's benchmark suite.
- Input
- $15.67 / 1M
- Output
- $70.15 / 1M
- Context
- 128,000
- Avg score
- 83.6
- Open weights
- No
Specification comparison
| Spec | Claude 3.7 Sonnet Turbo | Gemini 3 Flash | Edge |
|---|---|---|---|
| Input price / 1M | $15.56 | $15.67 | A |
| Output price / 1M | $63.75 | $70.15 | A |
| Context window | 200,000 | 128,000 | A |
| Max output | 16,384 | 65,536 | B |
| Average score | 82.3 | 83.6 | B |
| Arena Elo | 1458.8 | 1450.7 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude 3.7 Sonnet Turbo wins 4, Gemini 3 Flash wins 8, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude 3.7 Sonnet Turbo | Gemini 3 Flash | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 82.1 | 83.7 | 1.6 | Gemini 3 Flash |
| GPQA Diamond | 79.7 | 80.3 | 0.6 | Gemini 3 Flash |
| SWE-bench Verified | 73.9 | 72.5 | 1.4 | Claude 3.7 Sonnet Turbo |
| HumanEval | 87.6 | 86.2 | 1.4 | Claude 3.7 Sonnet Turbo |
| MATH-500 | 86.8 | 89.0 | 2.2 | Gemini 3 Flash |
| AIME 2025 | 81.4 | 84.5 | 3.1 | Gemini 3 Flash |
| LiveCodeBench | 75.5 | 79.3 | 3.8 | Gemini 3 Flash |
| IFEval | 87.4 | 91.0 | 3.6 | Gemini 3 Flash |
| TruthfulQA | 82.6 | 84.8 | 2.2 | Gemini 3 Flash |
| HellaSwag | 91.0 | 89.8 | 1.2 | Claude 3.7 Sonnet Turbo |
| MMMU | 77.6 | 78.2 | 0.6 | Gemini 3 Flash |
| Arena Elo | 1458.8 | 1450.7 | 8.1 | 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 Gemini 3 Flash costs about $29.29. Claude 3.7 Sonnet Turbo is roughly 6% cheaper than Gemini 3 Flash. 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 Gemini 3 Flash. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude 3.7 Sonnet Turbo wins 4, Gemini 3 Flash wins 8, and 0 are tied. On the index average, Gemini 3 Flash leads Claude 3.7 Sonnet Turbo by 1.3 points (83.6 versus 82.3).
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 Gemini 3 Flash for quality-sensitive work and Claude 3.7 Sonnet Turbo 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 Turbo if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 200,000-token context window.
Choose Gemini 3 Flash if
- You want the higher average benchmark score in this index.
- You need the larger 65,536-token output limit.
FAQ
Is Claude 3.7 Sonnet Turbo better than Gemini 3 Flash?
On the index average, Gemini 3 Flash leads Claude 3.7 Sonnet Turbo by 1.3 points (83.6 versus 82.3). The better choice depends on price, context and your task. Claude 3.7 Sonnet Turbo wins 4 benchmarks, Gemini 3 Flash wins 8.
Which is cheaper, Claude 3.7 Sonnet Turbo or Gemini 3 Flash?
Claude 3.7 Sonnet Turbo is cheaper on a blended 3:1 basis at about $27.61 per million tokens, versus $29.29 for Gemini 3 Flash.
Which has the larger context window?
Claude 3.7 Sonnet Turbo has the larger context window at 200,000 tokens. Gemini 3 Flash has 128,000 tokens.
Are these models open weights?
Claude 3.7 Sonnet Turbo is proprietary; Gemini 3 Flash is proprietary.
Which should I choose for production?
If you need a single default, start with Gemini 3 Flash for quality-sensitive work and Claude 3.7 Sonnet Turbo for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.