OpenAI: GPT-5.6 Terra vs Inception: Mercury
Compare OpenAI: GPT-5.6 Terra by OpenAI against Inception: Mercury by Inception, context windows of 1.1M vs 32K, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
Inception: MercuryRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — bigger model tier, newer, bigger context window, major provider backing.
Slight edge
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Terra
Input
$2.50
4.0× cheaper
Output
$15.00
Inception: Mercury
Input
$10.00
Output
$10.00
1.5× cheaper
OpenAI: GPT-5.6 Terra wins input (4.0× cheaper)·Inception: Mercury wins output (1.5× cheaper)
Writing DNA
Style Comparison
Similarity
53%
Inception: Mercury uses 4.3x more emoji
OpenAI: GPT-5.6 Terra
Inception: Mercury
57%Vocabulary55%
18wSentence Length40w
0.85Hedging0.39
2.8Bold4.9
4.6Lists3.8
0.00Emoji0.04
1.12Headings1.04
0.06Transitions0.03
Based on 27 + 17 text responses
Research
What we learned reading every model
FAQ
