ChatGPT-4o (March 2025)vsGemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking) 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 05-20 (thinking) |
|---|---|---|
| Input price | $5/M tokens | $0.15/M tokens |
| Output price | $15/M tokens | $3.5/M tokens |
| Context window | 128K tokens | 1.0M tokens |
| Released | Mar 2025 | May 2025 |
Our Verdict
ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview 05-20 (thinking)
Not enough votes to call it. On the specs, nothing separates them.
Gemini 2.5 Flash Preview 05-20 (thinking) costs 4.3x 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 05-20 (thinking)
Input
$0.15
33× cheaper
Output
$3.50
4.3× cheaper
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 33× input, 4.3× output
Writing DNA
Style Comparison
Similarity
41%
ChatGPT-4o (March 2025) uses 51.6x more hedging
ChatGPT-4o (March 2025)
Gemini 2.5 Flash Preview 05-20 (thinking)
55%Vocabulary70%
24wSentence Length11w
0.52Hedging0.00
3.3Bold4.2
6.0Lists7.3
0.94Emoji0.00
0.63Headings0.00
0.05Transitions0.00
Based on 15 + 3 text responses
Research
What we learned reading every model
FAQ
Common questions
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