OpenAI: GPT-5.6 Terra vs Inception: Mercury 2
Compare OpenAI: GPT-5.6 Terra by OpenAI against Inception: Mercury 2 by Inception, context windows of 1.1M vs 128K, tested across 53 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
Inception: Mercury 2Runner-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.
Inception: Mercury 2 is 20x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
Inception: Mercury 2
Input
$0.25
10× cheaper
Output
$0.75
20× cheaper
Inception: Mercury 2 is cheaper on both — 10× input, 20× output
Writing DNA
Style Comparison
Similarity
54%
Inception: Mercury 2 uses 8.2x more emoji
OpenAI: GPT-5.6 Terra
Inception: Mercury 2
57%Vocabulary53%
18wSentence Length22w
0.85Hedging0.40
2.8Bold6.6
4.6Lists2.6
0.00Emoji0.08
1.12Headings0.87
0.06Transitions0.14
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
