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Gemini 3.5 Flash vs Grok 4.20 0309

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

  • Gemini 3.5 Flash has the higher intelligence index (92.2 vs 88.5)
  • Gemini 3.5 Flash is cheaper ($1.50 vs $2.00 per 1M input)
  • Gemini 3.5 Flash is faster
Gemini 3.5 FlashGrok 4.20 0309
Intelligence index92.288.5
DeveloperGooglexAI
TypeMultimodalLLM
AccessAPI only
Context window1,048,576 tokens
Input price$1.50 / 1M$2.00 / 1M
Output price$9.00 / 1M$6.00 / 1M
Speed221 tok/s97 tok/s
ReleasedMay 19, 2026March 10, 2026
Parameters
Input modalitiesText, Image, Audio, Video
Output modalitiesText

Shared benchmarks

Gemini 3.5 Flash
Grok 4.20 0309
GPQA Diamond
92.2
88.5
Humanity’s Last Exam
41
30