GPT-5 Pro vs OpenAI: GPT-5.6 Terra
Compare GPT-5 Pro and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 400K vs 1.1M, tested across 41 shared challenges.
Our Verdict
GPT-5 Pro
OpenAI: GPT-5.6 Terra
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
OpenAI: GPT-5.6 Terra is 8.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
OpenAI: GPT-5.6 Terra
Input
$2.50
6.0× cheaper
Output
$15.00
8.0× cheaper
OpenAI: GPT-5.6 Terra is cheaper on both — 6.0× input, 8.0× output
Writing DNA
Style Comparison
Similarity
65%
OpenAI: GPT-5.6 Terra uses 275.5x more bold
GPT-5 Pro
OpenAI: GPT-5.6 Terra
65%Vocabulary57%
15wSentence Length18w
0.32Hedging0.85
0.0Bold2.8
2.9Lists4.6
0.00Emoji0.00
0.00Headings1.12
0.01Transitions0.06
Based on 11 + 27 text responses
Research
What we learned reading every model
FAQ
