Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-4.5
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against GPT-4.5 by OpenAI, context windows of 1.0M vs 128K, tested across 9 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Flash Preview 05-20 (thinking) is 43x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
500× cheaper
Output
$3.50
43× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 500× input, 43× output
Writing DNA
Style Comparison
Similarity
48%
GPT-4.5 uses 56.5x more hedging
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-4.5
70%Vocabulary63%
11wSentence Length16w
0.00Hedging0.57
4.2Bold4.7
7.3Lists6.4
0.00Emoji0.00
0.00Headings1.30
0.00Transitions0.54
Based on 3 + 11 text responses
Research
What we learned reading every model
FAQ
