DeepSeek R1 vs Google: Gemini 2.5 Flash Preview 09-2025
Compare DeepSeek R1 by DeepSeek against Google: Gemini 2.5 Flash Preview 09-2025 by Google AI, context windows of 128K vs 1.0M, tested across 51 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
DeepSeek R1Runner-up
No community votes yet. On paper, Google: Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
DeepSeek R1
Input
$0.55
Output
$2.19
1.1× cheaper
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
1.8× cheaper
Output
$2.50
Google: Gemini 2.5 Flash Preview 09-2025 wins input (1.8× cheaper)·DeepSeek R1 wins output (1.1× cheaper)
Writing DNA
Style Comparison
Similarity
66%
Google: Gemini 2.5 Flash Preview 09-2025 uses 3.1x more emoji
DeepSeek R1
Google: Gemini 2.5 Flash Preview 09-2025
62%Vocabulary53%
15wSentence Length19w
0.52Hedging0.30
8.0Bold5.8
5.7Lists3.1
0.04Emoji0.14
0.62Headings0.93
0.28Transitions0.22
Based on 22 + 22 text responses
Research
What we learned reading every model
FAQ
