Claude 3.5 Sonnet vs Gemini 1.5 Flash
Pricing, context window, and benchmark comparison · Last updated April 2026
Gemini 1.5 Flash is cheaper than Claude 3.5 Sonnet at $0.07/1M/1M vs $3.00/1M/1M input tokens — a 40.0x cost difference. Claude 3.5 Sonnet scores higher on quality benchmarks (ELO 1295). Choose Gemini 1.5 Flash for cost-sensitive workloads; choose Claude 3.5 Sonnet for maximum quality.
Which is cheaper: Claude 3.5 Sonnet or Gemini 1.5 Flash?
Gemini 1.5 Flash is the cheaper option at $0.07/1M per 1M input tokens, compared to $3.00/1M for Claude 3.5 Sonnet. That is a 40.0x cost difference on input tokens. Output pricing follows a similar pattern: Claude 3.5 Sonnet charges $15.00/1M/1M vs $0.30/1M/1M for Gemini 1.5 Flash.
Which has better quality: Claude 3.5 Sonnet or Gemini 1.5 Flash?
Based on LMSYS Chatbot Arena rankings, Claude 3.5 Sonnet achieves a higher ELO score (1295 vs 1211), suggesting stronger performance on open-ended tasks. Claude 3.5 Sonnet excels at 200k context window — best for long documents. Gemini 1.5 Flash is known for one of the cheapest high-quality models available.
Which should you choose: Claude 3.5 Sonnet or Gemini 1.5 Flash?
- → 200K context window — best for long documents
- → Industry-leading coding performance
- → Nuanced instruction following
- → One of the cheapest high-quality models available
- → 1M token context window
- → Very fast inference
Frequently Asked Questions
Which is cheaper: Claude 3.5 Sonnet or Gemini 1.5 Flash?
Gemini 1.5 Flash is cheaper at $0.07/1M per 1M input tokens, making it 40.0x more affordable.
Which has better quality: Claude 3.5 Sonnet or Gemini 1.5 Flash?
Claude 3.5 Sonnet scores higher on the LMSYS Chatbot Arena with an ELO of 1295, suggesting better overall quality for most tasks.
Which has a larger context window: Claude 3.5 Sonnet or Gemini 1.5 Flash?
Gemini 1.5 Flash has a larger context window at 1000K tokens.
Should I choose Claude 3.5 Sonnet or Gemini 1.5 Flash?
Choose Gemini 1.5 Flash if cost is the priority. Choose Claude 3.5 Sonnet if benchmark quality is most important. Consider your specific use case: Claude 3.5 Sonnet is best for coding and document-analysis, while Gemini 1.5 Flash excels at low-cost and fast-response.
Is Claude 3.5 Sonnet or Gemini 1.5 Flash open source?
Claude 3.5 Sonnet is proprietary. Gemini 1.5 Flash is proprietary.