Gemini 1.5 Pro vs Gemini 1.5 Flash
Pricing, context window, and benchmark comparison · Last updated April 2026
Gemini 1.5 Flash is cheaper than Gemini 1.5 Pro at $0.07/1M/1M vs $1.25/1M/1M input tokens — a 16.7x cost difference. Gemini 1.5 Pro scores higher on quality benchmarks (ELO 1266). Choose Gemini 1.5 Flash for cost-sensitive workloads; choose Gemini 1.5 Pro for maximum quality.
Which is cheaper: Gemini 1.5 Pro or Gemini 1.5 Flash?
Gemini 1.5 Flash is the cheaper option at $0.07/1M per 1M input tokens, compared to $1.25/1M for Gemini 1.5 Pro. That is a 16.7x cost difference on input tokens. Output pricing follows a similar pattern: Gemini 1.5 Pro charges $5.00/1M/1M vs $0.30/1M/1M for Gemini 1.5 Flash.
Which has better quality: Gemini 1.5 Pro or Gemini 1.5 Flash?
Based on LMSYS Chatbot Arena rankings, Gemini 1.5 Pro achieves a higher ELO score (1266 vs 1211), suggesting stronger performance on open-ended tasks. Gemini 1.5 Pro excels at 2m token context window — largest available commercially. Gemini 1.5 Flash is known for one of the cheapest high-quality models available.
Which should you choose: Gemini 1.5 Pro or Gemini 1.5 Flash?
- → 2M token context window — largest available commercially
- → Strong multimodal capabilities (text, images, video, audio)
- → Excellent price-to-quality ratio
- → One of the cheapest high-quality models available
- → 1M token context window
- → Very fast inference
Frequently Asked Questions
Which is cheaper: Gemini 1.5 Pro or Gemini 1.5 Flash?
Gemini 1.5 Flash is cheaper at $0.07/1M per 1M input tokens, making it 16.7x more affordable.
Which has better quality: Gemini 1.5 Pro or Gemini 1.5 Flash?
Gemini 1.5 Pro scores higher on the LMSYS Chatbot Arena with an ELO of 1266, suggesting better overall quality for most tasks.
Which has a larger context window: Gemini 1.5 Pro or Gemini 1.5 Flash?
Gemini 1.5 Pro has a larger context window at 2000K tokens.
Should I choose Gemini 1.5 Pro or Gemini 1.5 Flash?
Choose Gemini 1.5 Flash if cost is the priority. Choose Gemini 1.5 Pro if benchmark quality is most important. Consider your specific use case: Gemini 1.5 Pro is best for long-context and document-analysis, while Gemini 1.5 Flash excels at low-cost and fast-response.
Is Gemini 1.5 Pro or Gemini 1.5 Flash open source?
Gemini 1.5 Pro is proprietary. Gemini 1.5 Flash is proprietary.