What is the difference between Gemini 3 Flash Preview and Grok 3?

Gemini 3 Flash Preview is developed by Google AI while Grok 3 is developed by xAI. Gemini 3 Flash Preview has a 1.0M token context window vs Grok 3's 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3 Flash Preview or Grok 3?

It depends on your use case. Gemini 3 Flash Preview and Grok 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How can I compare Gemini 3 Flash Preview and Grok 3 on Rival?

This page shows a side-by-side comparison of Gemini 3 Flash Preview and Grok 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Dec 2025

Gemini 3 Flash PreviewvsGrok 3

Gemini 3 Flash Preview has a larger context window than Grok 3 (1.0M tokens vs 128K tokens).

Gemini 3 Flash Preview and Grok 3 compared across 53 shared prompts
Spec	Gemini 3 Flash Preview	Grok 3
Input price	$0.5/M tokens	—
Output price	$3/M tokens	—
Context window	1.0M tokens	128K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Dec 2025	Feb 2025
SWE-bench Verified	78.0%	63.8%