GPT-5.3 Chat vs OpenAI: GPT-5.6 Terra
Compare GPT-5.3 Chat and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 128K vs 1.1M, tested across 53 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
GPT-5.3 ChatRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
1.4× cheaper
Output
$14.00
1.1× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
GPT-5.3 Chat is cheaper on both — 1.4× input, 1.1× output
Writing DNA
Style Comparison
Similarity
58%
OpenAI: GPT-5.6 Terra uses 112.3x more headings
GPT-5.3 Chat
OpenAI: GPT-5.6 Terra
59%Vocabulary57%
26wSentence Length18w
0.84Hedging0.85
1.7Bold2.8
6.6Lists4.6
0.00Emoji0.00
0.00Headings1.12
0.25Transitions0.06
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
