Claude Opus 4.5vsGemini 3 Flash Preview
Gemini 3 Flash Preview is the newer model, released after Claude Opus 4.5.
| Spec | Claude Opus 4.5 | Gemini 3 Flash Preview |
|---|---|---|
| Input price | — | $0.5/M tokens |
| Output price | — | $3/M tokens |
| Context window | — | 1.0M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Dec 2025 |
| SWE-bench Verified | 80.9% | 78.0% |
Our Verdict
Claude Opus 4.5
Gemini 3 Flash PreviewRunner-up
Not enough votes to call it. On the specs, Claude Opus 4.5 has the edge: bigger model tier.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
Gemini 3 Flash Preview
Input
$0.50
Output
$3.00
Where to run it
6 hosts, cheapest first
Gemini 3 Flash Preview2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
44%
Claude Opus 4.5 uses 18.5x more emoji
Claude Opus 4.5
Gemini 3 Flash Preview
66%Vocabulary57%
51wSentence Length18w
0.82Hedging0.41
6.0Bold7.4
4.5Lists4.2
0.18Emoji0.00
1.46Headings0.77
0.05Transitions0.08
Based on 27 + 28 text responses
Research
What we learned reading every model
FAQ
Common questions
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