Google: Gemini 2.5 Flash Preview 09-2025 vs GPT OSS 120B
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against GPT OSS 120B by OpenAI, context windows of 1.0M vs 131K, tested across 51 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
GPT OSS 120BRunner-up
No community votes yet. On paper, Google: Gemini 2.5 Flash Preview 09-2025 has the edge — newer, bigger context window.
GPT OSS 120B is 3.1x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
Output
$2.50
GPT OSS 120B
Input
$0.18
1.7× cheaper
Output
$0.80
3.1× cheaper
GPT OSS 120B is cheaper on both — 1.7× input, 3.1× output
Writing DNA
Style Comparison
Similarity
71%
Google: Gemini 2.5 Flash Preview 09-2025 uses 1.7x more lists
Google: Gemini 2.5 Flash Preview 09-2025
GPT OSS 120B
53%Vocabulary52%
19wSentence Length19w
0.30Hedging0.28
5.8Bold7.4
3.1Lists1.8
0.14Emoji0.15
0.93Headings0.73
0.22Transitions0.17
Based on 22 + 21 text responses
Research
What we learned reading every model
FAQ
