GPT-5.3 Chat vs Inception: Mercury
Compare GPT-5.3 Chat by OpenAI against Inception: Mercury by Inception, context windows of 128K vs 32K, tested across 53 shared challenges.
Our Verdict
GPT-5.3 Chat
Inception: MercuryRunner-up
No community votes yet. On paper, GPT-5.3 Chat has the edge — bigger model tier, newer, bigger context window, major provider backing.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
5.7× cheaper
Output
$14.00
Inception: Mercury
Input
$10.00
Output
$10.00
1.4× cheaper
GPT-5.3 Chat wins input (5.7× cheaper)·Inception: Mercury wins output (1.4× cheaper)
Writing DNA
Style Comparison
Similarity
73%
Inception: Mercury uses 4.3x more emoji
GPT-5.3 Chat
Inception: Mercury
59%Vocabulary55%
26wSentence Length40w
0.84Hedging0.39
1.7Bold4.9
6.6Lists3.8
0.00Emoji0.04
0.00Headings1.04
0.25Transitions0.03
Based on 23 + 17 text responses
Research
What we learned reading every model
FAQ
