What is the difference between Claude Opus 4.1 and OpenRouter Fusion · Budget (Jun 2026)?

Claude Opus 4.1 is developed by Anthropic while OpenRouter Fusion · Budget (Jun 2026) is developed by OpenRouter. Claude Opus 4.1 has a 200K token context window vs OpenRouter Fusion · Budget (Jun 2026)'s 256K. You can compare their actual outputs across 44 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or OpenRouter Fusion · Budget (Jun 2026)?

It depends on your use case. Claude Opus 4.1 and OpenRouter Fusion · Budget (Jun 2026) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 44 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.1 and OpenRouter Fusion · Budget (Jun 2026) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 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 4.1vsOpenRouter Fusion · Budget (Jun 2026)

OpenRouter Fusion · Budget (Jun 2026) has a larger context window than Claude Opus 4.1 (256K tokens vs 200K tokens).

Claude Opus 4.1 and OpenRouter Fusion · Budget (Jun 2026) compared across 44 shared prompts
Spec	Claude Opus 4.1	OpenRouter Fusion · Budget (Jun 2026)
Input price	$15/M tokens	—
Output price	$75/M tokens	—
Context window	200K tokens	256K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Aug 2025	Jun 2026