ChatGPT-4o (March 2025)vsGemini 2.5 Flash Preview
Gemini 2.5 Flash Preview is cheaper than ChatGPT-4o (March 2025) at $0.15/M vs $5/M input tokens.
| Spec | ChatGPT-4o (March 2025) | Gemini 2.5 Flash Preview |
|---|---|---|
| Input price | $5/M tokens | $0.15/M tokens |
| Output price | $15/M tokens | $0.6/M tokens |
| Context window | 128K tokens | 1.0M tokens |
| Parameters | Not disclosed | Not disclosed |
| Free API (OpenRouter) | No | No |
| Released | Mar 2025 | Apr 2025 |
Our Verdict
ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview
Not enough votes to call it. On the specs, nothing separates them.
Gemini 2.5 Flash Preview costs 25x less per token.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Gemini 2.5 Flash Preview
Input
$0.15
33× cheaper
Output
$0.60
25× cheaper
Gemini 2.5 Flash Preview is cheaper on both: 33× input, 25× output.
Writing DNA
Style Comparison
Similarity
41%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview
55%Vocabulary51%
24wSentence Length15w
0.52Hedging0.70
3.3Bold4.1
6.0Lists3.3
0.94Emoji0.00
0.63Headings0.09
0.05Transitions0.24
Based on 15 + 12 text responses
Research
What we learned reading every model
FAQ
Common questions
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