GPT-5 vs GPT-5.1 Chat
Compare GPT-5 and GPT-5.1 Chat, both from OpenAI, context windows of 400K vs 128K, tested across 52 shared challenges.
Our Verdict
GPT-5
GPT-5.1 ChatRunner-up
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
Output
$10.00
GPT-5.1 Chat
Input
$1.25
Output
$10.00
Writing DNA
Style Comparison
Similarity
57%
GPT-5 uses 16.2x more headings
GPT-5
GPT-5.1 Chat
65%Vocabulary73%
13wSentence Length18w
0.20Hedging0.45
0.2Bold1.1
4.6Lists2.4
0.00Emoji0.00
0.16Headings0.00
0.03Transitions0.06
Based on 16 + 15 text responses
Research
What we learned reading every model
FAQ
