What is the difference between Claude Opus 4.8 and Gemini 3 Flash Preview?

Claude Opus 4.8 is developed by Anthropic while Gemini 3 Flash Preview is developed by Google AI. Claude Opus 4.8 has a 1.0M token context window vs Gemini 3 Flash Preview's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or Gemini 3 Flash Preview?

It depends on your use case. Claude Opus 4.8 and Gemini 3 Flash Preview 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 Claude Opus 4.8 cost compared to Gemini 3 Flash Preview?

Claude Opus 4.8 costs $5/M input tokens and Gemini 3 Flash Preview costs $0.5/M input tokens. Gemini 3 Flash Preview is $4.50/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 Opus 4.8 and Gemini 3 Flash Preview on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 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 May 2026

Claude Opus 4.8vsGemini 3 Flash Preview

Gemini 3 Flash Preview is cheaper than Claude Opus 4.8 at $0.5/M vs $5/M input tokens.

Claude Opus 4.8 and Gemini 3 Flash Preview compared across 54 shared prompts
Spec	Claude Opus 4.8	Gemini 3 Flash Preview
Input price	$5/M tokens	$0.5/M tokens
Output price	$25/M tokens	$3/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2026	Dec 2025