What is the difference between Gemini 3.8 Flash and Grok 4.20 Multi-Agent Beta?

Gemini 3.8 Flash is developed by Google AI while Grok 4.20 Multi-Agent Beta is developed by xAI. Gemini 3.8 Flash has a 1.0M token context window vs Grok 4.20 Multi-Agent Beta's 2.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.8 Flash or Grok 4.20 Multi-Agent Beta?

It depends on your use case. Gemini 3.8 Flash and Grok 4.20 Multi-Agent Beta 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 3.8 Flash cost compared to Grok 4.20 Multi-Agent Beta?

Gemini 3.8 Flash costs $0.75/M input tokens and Grok 4.20 Multi-Agent Beta costs $2/M input tokens. Gemini 3.8 Flash is $1.25/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 3.8 Flash and Grok 4.20 Multi-Agent Beta on Rival?

This page shows a side-by-side comparison of Gemini 3.8 Flash and Grok 4.20 Multi-Agent Beta 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 Sep 2026

Gemini 3.8 FlashvsGrok 4.20 Multi-Agent Beta

Gemini 3.8 Flash is cheaper than Grok 4.20 Multi-Agent Beta at $0.75/M vs $2/M input tokens.

Gemini 3.8 Flash and Grok 4.20 Multi-Agent Beta compared across 53 shared prompts
Spec	Gemini 3.8 Flash	Grok 4.20 Multi-Agent Beta
Input price	$0.75/M tokens	$2/M tokens
Output price	$3.75/M tokens	$6/M tokens
Context window	1.0M tokens	2.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Mar 2026