GPT-5.1 Chat vs OpenAI o3
Compare GPT-5.1 Chat and OpenAI o3, both from OpenAI, tested across 53 shared challenges.
Our Verdict
GPT-5.1 Chat
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 Chat is 4.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1 Chat
Input
$1.25
8.0× cheaper
Output
$10.00
4.0× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
GPT-5.1 Chat is cheaper on both — 8.0× input, 4.0× output
Writing DNA
Style Comparison
Similarity
77%
OpenAI o3 uses 37.9x more headings
GPT-5.1 Chat
OpenAI o3
73%Vocabulary68%
18wSentence Length14w
0.45Hedging0.26
1.1Bold0.7
2.4Lists3.0
0.00Emoji0.00
0.00Headings0.38
0.06Transitions0.12
Based on 15 + 16 text responses
Research
What we learned reading every model
FAQ
