What is the difference between Claude Opus 4.1 and Gemini 2.5 Pro (I/O Edition)?

Claude Opus 4.1 is developed by Anthropic while Gemini 2.5 Pro (I/O Edition) is developed by Google AI. You can compare their actual outputs across 40 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or Gemini 2.5 Pro (I/O Edition)?

It depends on your use case. Claude Opus 4.1 and Gemini 2.5 Pro (I/O Edition) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 40 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.1 cost compared to Gemini 2.5 Pro (I/O Edition)?

Claude Opus 4.1 costs $15/M input tokens and Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens. Gemini 2.5 Pro (I/O Edition) is $13.75/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 Claude Opus 4.1 and Gemini 2.5 Pro (I/O Edition) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and Gemini 2.5 Pro (I/O Edition) 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

Claude Opus 4.1vsGemini 2.5 Pro (I/O Edition)

Gemini 2.5 Pro (I/O Edition) is cheaper than Claude Opus 4.1 at $1.25/M vs $15/M input tokens.

Claude Opus 4.1 and Gemini 2.5 Pro (I/O Edition) compared across 40 shared prompts
Spec	Claude Opus 4.1	Gemini 2.5 Pro (I/O Edition)
Input price	$15/M tokens	$1.25/M tokens
Output price	$75/M tokens	$10/M tokens
Context window	200K tokens	—
Parameters	Not disclosed	Not disclosed
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	May 2025