What is the difference between Claude Opus 4.8 and Gemini 3.8 Flash?

Claude Opus 4.8 is developed by Anthropic while Gemini 3.8 Flash is developed by Google AI. Claude Opus 4.8 has a 1.0M token context window vs Gemini 3.8 Flash'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 3.8 Flash?

It depends on your use case. Claude Opus 4.8 and Gemini 3.8 Flash 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 3.8 Flash?

Claude Opus 4.8 costs $5/M input tokens and Gemini 3.8 Flash costs $0.75/M input tokens. Gemini 3.8 Flash is $4.25/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 3.8 Flash on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and Gemini 3.8 Flash 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 Sep 2026

Claude Opus 4.8vsGemini 3.8 Flash

Gemini 3.8 Flash is cheaper than Claude Opus 4.8 at $0.75/M vs $5/M input tokens.

Claude Opus 4.8 and Gemini 3.8 Flash compared across 54 shared prompts
Spec	Claude Opus 4.8	Gemini 3.8 Flash
Input price	$5/M tokens	$0.75/M tokens
Output price	$25/M tokens	$3.75/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2026	Sep 2026