GPT-5.1 vs OpenAI o3
Compare GPT-5.1 and OpenAI o3, both from OpenAI, tested across 52 shared challenges.
Our Verdict
GPT-5.1
OpenAI o3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.1 is 4.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
8.0× cheaper
Output
$10.00
4.0× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
GPT-5.1 is cheaper on both — 8.0× input, 4.0× output
Writing DNA
Style Comparison
Similarity
55%
GPT-5.1 uses 5.0x more bold
GPT-5.1
OpenAI o3
62%Vocabulary68%
19wSentence Length14w
0.29Hedging0.26
3.5Bold0.7
7.2Lists3.0
0.00Emoji0.00
0.61Headings0.38
0.03Transitions0.12
Based on 14 + 16 text responses
Research
What we learned reading every model
FAQ
Common questions
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