What is the difference between GPT-5 and Grok Code Fast 1?

GPT-5 is developed by OpenAI while Grok Code Fast 1 is developed by xAI. GPT-5 has a 400K token context window vs Grok Code Fast 1's 256K. in 175 community votes on Rival, GPT-5 wins 78% of head-to-head matchups. These results are based on blind head-to-head voting across 52 challenges.

Which is better, GPT-5 or Grok Code Fast 1?

Based on 175 community votes on Rival, GPT-5 wins 78% of head-to-head matchups against Grok Code Fast 1. GPT-5 is strongest in Reasoning, Image Generation, Web Design. However, Grok Code Fast 1 leads in Conversation, Analysis.

How much does GPT-5 cost compared to Grok Code Fast 1?

GPT-5 costs $1.25/M input tokens and Grok Code Fast 1 costs $0.2/M input tokens. Grok Code Fast 1 is $1.05/M cheaper per input. The more expensive model wins 78% of duels, so the premium may be justified by quality.

How are GPT-5 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. 175 votes have been collected for this pair across 52 challenges. All vote data is part of Rival's open dataset.

Updated Aug 2025

GPT-5vsGrok Code Fast 1

GPT-5 wins 78% of 175 blind community votes against Grok Code Fast 1 on Rival.

GPT-5 and Grok Code Fast 1 compared across 52 shared prompts
Spec	GPT-5	Grok Code Fast 1
Win rate	78%	23%
Input price	$1.25/M tokens	$0.2/M tokens
Output price	$10/M tokens	$1.5/M tokens
Context window	400K tokens	256K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Aug 2025	Aug 2025
SWE-bench Verified	74.9%	70.8%