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Gemini 1.5 Pro vs Gemini 3.5 Flash

Google vs Google — benchmarks, pricing, and capabilities side by side.

  • Gemini 3.5 Flash has the higher intelligence index (92.2 vs 67.3)
  • Gemini 1.5 Pro is cheaper ($1.25 vs $1.50 per 1M input)
  • Gemini 3.5 Flash is faster
  • Gemini 1.5 Pro has a larger context window (2M)
Gemini 1.5 ProGemini 3.5 Flash
Intelligence index67.392.2
DeveloperGoogleGoogle
TypeMultimodalMultimodal
AccessAPI onlyAPI only
Context window2,000,000 tokens1,048,576 tokens
Input price$1.25 / 1M$1.50 / 1M
Output price$5.00 / 1M$9.00 / 1M
Speed85 tok/s221 tok/s
ReleasedFebruary 15, 2024May 19, 2026
Parameters
Input modalitiesText, Image, Audio, VideoText, Image, Audio, Video
Output modalitiesTextText

Shared benchmarks

Gemini 1.5 Pro
Gemini 3.5 Flash
GPQA Diamond
59.1
92.2
Humanity’s Last Exam
4.9
41