What is the difference between Gemini 3.1 Pro Preview and Grok 4.3?

Gemini 3.1 Pro Preview is developed by Google AI while Grok 4.3 is developed by xAI. Gemini 3.1 Pro Preview has a 1.0M token context window vs Grok 4.3's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.1 Pro Preview or Grok 4.3?

It depends on your use case. Gemini 3.1 Pro Preview and Grok 4.3 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 much does Gemini 3.1 Pro Preview cost compared to Grok 4.3?

Gemini 3.1 Pro Preview costs $2/M input tokens and Grok 4.3 costs $1.25/M input tokens. Grok 4.3 is $0.75/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 3.1 Pro Preview and Grok 4.3 on Rival?

This page shows a side-by-side comparison of Gemini 3.1 Pro Preview and Grok 4.3 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 May 2026

Gemini 3.1 Pro PreviewvsGrok 4.3

Grok 4.3 is cheaper than Gemini 3.1 Pro Preview at $1.25/M vs $2/M input tokens.

Gemini 3.1 Pro Preview and Grok 4.3 compared across 53 shared prompts
Spec	Gemini 3.1 Pro Preview	Grok 4.3
Input price	$2/M tokens	$1.25/M tokens
Output price	$12/M tokens	$2.5/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Feb 2026	May 2026