Claude Opus 4.5vsGemini 2.5 Pro (I/O Edition)
Claude Opus 4.5 is the newer model, released after Gemini 2.5 Pro (I/O Edition).
| Spec | Claude Opus 4.5 | Gemini 2.5 Pro (I/O Edition) |
|---|---|---|
| Input price | — | $1.25/M tokens |
| Output price | — | $10/M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | May 2025 |
Our Verdict
Claude Opus 4.5
Gemini 2.5 Pro (I/O Edition)
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
Where to run it
6 hosts, cheapest first
Gemini 2.5 Pro (I/O Edition)2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
52%
Claude Opus 4.5 uses 18.5x more emoji
Claude Opus 4.5
Gemini 2.5 Pro (I/O Edition)
66%Vocabulary58%
51wSentence Length16w
0.82Hedging0.38
6.0Bold5.8
4.5Lists5.0
0.18Emoji0.00
1.46Headings0.63
0.05Transitions0.01
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
Common questions
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