Claude Opus 4.5vsOpenRouter Fusion · Quality (Jun 2026)
OpenRouter Fusion · Quality (Jun 2026) is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | OpenRouter Fusion · Quality (Jun 2026) |
|---|---|---|
| Context window | — | 256K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Jun 2026 |
Our Verdict
Claude Opus 4.5
OpenRouter Fusion · Quality (Jun 2026)
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Reviewing agent-written code?See a Brief PR report
Where to run it
4 hosts
OpenRouter Fusion · Quality (Jun 2026)
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 12 Sep 2026.
Writing DNA
Style Comparison
Similarity
47%
OpenRouter Fusion · Quality (Jun 2026) uses 3.7x more emoji
Claude Opus 4.5
OpenRouter Fusion · Quality (Jun 2026)
66%Vocabulary55%
51wSentence Length21w
0.82Hedging0.47
6.0Bold4.0
4.5Lists2.0
0.18Emoji0.68
1.46Headings0.73
0.05Transitions0.09
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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