What is the difference between Claude 3 Opus and Gemini 3 Flash Preview?

Claude 3 Opus is developed by Anthropic while Gemini 3 Flash Preview is developed by Google AI. Claude 3 Opus has a 200K token context window vs Gemini 3 Flash Preview's 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or Gemini 3 Flash Preview?

It depends on your use case. Claude 3 Opus and Gemini 3 Flash Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to Gemini 3 Flash Preview?

Claude 3 Opus costs $15/M input tokens and Gemini 3 Flash Preview costs $0.5/M input tokens. Gemini 3 Flash Preview is $14.50/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 3 Opus and Gemini 3 Flash Preview on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and Gemini 3 Flash Preview 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 Dec 2025

Claude 3 OpusvsGemini 3 Flash Preview

Gemini 3 Flash Preview is cheaper than Claude 3 Opus at $0.5/M vs $15/M input tokens.

Claude 3 Opus and Gemini 3 Flash Preview compared across 12 shared prompts
Spec	Claude 3 Opus	Gemini 3 Flash Preview
Input price	$15/M tokens	$0.5/M tokens
Output price	$75/M tokens	$3/M tokens
Context window	200K tokens	1.0M tokens
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Mar 2024	Dec 2025