Question 1

What is the difference between xAI: Grok 4 and Claude Opus 4?

Accepted Answer

xAI: Grok 4 is developed by xAI while Claude Opus 4 is developed by Anthropic. xAI: Grok 4 has a 256K token context window vs Claude Opus 4's 200K. in 61 community votes on RIVAL, Claude Opus 4 wins 80% of head-to-head matchups. These results are based on blind head-to-head voting across 28 challenges.

Question 2

Which is better, xAI: Grok 4 or Claude Opus 4?

Accepted Answer

Based on 61 community votes on RIVAL, Claude Opus 4 wins 80% of head-to-head matchups against xAI: Grok 4. Claude Opus 4 is strongest in Web Design, Image Generation, Reasoning.

Question 3

How much does xAI: Grok 4 cost compared to Claude Opus 4?

Accepted Answer

xAI: Grok 4 costs $3/M input tokens and Claude Opus 4 costs $15/M input tokens. xAI: Grok 4 is $12.00/M cheaper per input. The more expensive model wins 80% of duels, so the premium may be justified by quality.

Question 4

How are xAI: Grok 4 vs Claude Opus 4 votes collected on RIVAL?

Accepted Answer

RIVAL presents both models' outputs side-by-side in blind duels — voters see the responses but don't know which model produced each one. This eliminates brand bias. 61 votes have been collected for this pair across 28 challenges. All vote data is part of RIVAL's open dataset.