What is the difference between Claude Opus 4.8 and OpenRouter Fusion · Budget (Jun 2026)?

Claude Opus 4.8 is developed by Anthropic while OpenRouter Fusion · Budget (Jun 2026) is developed by OpenRouter. Claude Opus 4.8 has a 1.0M token context window vs OpenRouter Fusion · Budget (Jun 2026)'s 256K. You can compare their actual outputs across 45 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or OpenRouter Fusion · Budget (Jun 2026)?

It depends on your use case. Claude Opus 4.8 and OpenRouter Fusion · Budget (Jun 2026) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 45 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.8 and OpenRouter Fusion · Budget (Jun 2026) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and OpenRouter Fusion · Budget (Jun 2026) 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 Jun 2026

Claude Opus 4.8vsOpenRouter Fusion · Budget (Jun 2026)

Claude Opus 4.8 has a larger context window than OpenRouter Fusion · Budget (Jun 2026) (1.0M tokens vs 256K tokens).

Claude Opus 4.8 and OpenRouter Fusion · Budget (Jun 2026) compared across 45 shared prompts
Spec	Claude Opus 4.8	OpenRouter Fusion · Budget (Jun 2026)
Input price	$5/M tokens	—
Output price	$25/M tokens	—
Context window	1.0M tokens	256K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	May 2026	Jun 2026