What is the difference between Claude Opus 4.1 and Grok Code Fast 1?

Claude Opus 4.1 is developed by Anthropic while Grok Code Fast 1 is developed by xAI. Claude Opus 4.1 has a 200K token context window vs Grok Code Fast 1's 256K. in 75 community votes on Rival, Claude Opus 4.1 wins 85% of head-to-head matchups. These results are based on blind head-to-head voting across 53 challenges.

Which is better, Claude Opus 4.1 or Grok Code Fast 1?

Based on 75 community votes on Rival, Claude Opus 4.1 wins 85% of head-to-head matchups against Grok Code Fast 1. Claude Opus 4.1 is strongest in Web Design, Image Generation, Analysis.

How much does Claude Opus 4.1 cost compared to Grok Code Fast 1?

Claude Opus 4.1 costs $15/M input tokens and Grok Code Fast 1 costs $0.2/M input tokens. Grok Code Fast 1 is $14.80/M cheaper per input. The more expensive model wins 85% of duels, so the premium may be justified by quality.

How are Claude Opus 4.1 vs Grok Code Fast 1 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 75 votes have been collected for this pair across 53 challenges. All vote data is part of Rival's open dataset.

Updated Aug 2025

Claude Opus 4.1vsGrok Code Fast 1

Claude Opus 4.1 wins 85% of 75 blind community votes against Grok Code Fast 1 on Rival.

Claude Opus 4.1 and Grok Code Fast 1 compared across 53 shared prompts
Spec	Claude Opus 4.1	Grok Code Fast 1
Win rate	85%	15%
Input price	$15/M tokens	$0.2/M tokens
Output price	$75/M tokens	$1.5/M tokens
Context window	200K tokens	256K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Aug 2025	Aug 2025
SWE-bench Verified	74.5%	70.8%