What is the difference between Grok Code Fast 1 and OpenAI o3?

Grok Code Fast 1 is developed by xAI while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Grok Code Fast 1 or OpenAI o3?

It depends on your use case. Grok Code Fast 1 and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Grok Code Fast 1 cost compared to OpenAI o3?

Grok Code Fast 1 costs $0.2/M input tokens and OpenAI o3 costs $10/M input tokens. Grok Code Fast 1 is $9.80/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 Code Fast 1 and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Grok Code Fast 1 and OpenAI o3 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 Aug 2025

Grok Code Fast 1vsOpenAI o3

Grok Code Fast 1 is cheaper than OpenAI o3 at $0.2/M vs $10/M input tokens.

Grok Code Fast 1 and OpenAI o3 compared across 54 shared prompts
Spec	Grok Code Fast 1	OpenAI o3
Input price	$0.2/M tokens	$10/M tokens
Output price	$1.5/M tokens	$40/M tokens
Context window	256K tokens	—
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	Apr 2025
SWE-bench Verified	70.8%	69.1%