Claude Opus 5 vs OpenRouter Fusion · Quality (Jun 2026)
Compare Claude Opus 5 by Anthropic against OpenRouter Fusion · Quality (Jun 2026) by OpenRouter, context windows of 1.0M vs 256K, tested across 54 shared challenges.
Our Verdict
Claude Opus 5
OpenRouter Fusion · Quality (Jun 2026)Runner-up
No community votes yet. On paper, Claude Opus 5 has the edge — newer, bigger context window, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
OpenRouter Fusion · Quality (Jun 2026)
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
82%
OpenRouter Fusion · Quality (Jun 2026) uses 39.7x more emoji
Claude Opus 5
OpenRouter Fusion · Quality (Jun 2026)
54%Vocabulary55%
21wSentence Length21w
0.40Hedging0.47
3.9Bold4.0
1.9Lists2.0
0.02Emoji0.68
0.71Headings0.73
0.05Transitions0.09
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
