What is the difference between Grok 3 Beta and Mercury 2?

Grok 3 Beta is developed by xAI while Mercury 2 is developed by Inception. Grok 3 Beta has a 131K token context window vs Mercury 2's 128K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Grok 3 Beta or Mercury 2?

It depends on your use case. Grok 3 Beta and Mercury 2 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 Grok 3 Beta cost compared to Mercury 2?

Grok 3 Beta costs $2/M input tokens and Mercury 2 costs $0.25/M input tokens. Mercury 2 is $1.75/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 Grok 3 Beta and Mercury 2 on Rival?

This page shows a side-by-side comparison of Grok 3 Beta and Mercury 2 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 Mar 2026

Grok 3 BetavsMercury 2

Mercury 2 is cheaper than Grok 3 Beta at $0.25/M vs $2/M input tokens.

Grok 3 Beta and Mercury 2 compared across 53 shared prompts
Spec	Grok 3 Beta	Mercury 2
Input price	$2/M tokens	$0.25/M tokens
Output price	$4/M tokens	$0.75/M tokens
Context window	131K tokens	128K tokens
Free API (OpenRouter)	No	No
Released	Apr 2025	Mar 2026