Claude Opus 4vsGemini 2.5 Pro (I/O Edition)
Claude Opus 4 and Gemini 2.5 Pro (I/O Edition) are dead even across 45 blind community votes on Rival.
| Spec | Claude Opus 4 | Gemini 2.5 Pro (I/O Edition) |
|---|---|---|
| Win rate | 48% | 52% |
| Input price | $15/M tokens | $1.25/M tokens |
| Output price | $75/M tokens | $10/M tokens |
| Context window | 200K tokens | — |
| Parameters | Not disclosed | Not disclosed |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | May 2025 |
Our Verdict
Claude Opus 4
Gemini 2.5 Pro (I/O Edition)
Too close to call. Pick based on your use case.
Pick Claude Opus 4 for Conversation, Web Design. Pick Gemini 2.5 Pro (I/O Edition) for Image Generation. Gemini 2.5 Pro (I/O Edition) costs 7.5x less per token.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
12× cheaper
Output
$10.00
7.5× cheaper
Gemini 2.5 Pro (I/O Edition) is cheaper on both: 12× input, 7.5× output.
Where to run it
3 hosts, cheapest first
Claude Opus 41 host
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
66%
Claude Opus 4 uses 118.4x more emoji
Claude Opus 4
Gemini 2.5 Pro (I/O Edition)
65%Vocabulary58%
57wSentence Length16w
0.67Hedging0.38
3.8Bold5.8
6.8Lists5.0
1.18Emoji0.00
1.42Headings0.63
0.22Transitions0.01
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
Common questions
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