ChatGPT-4o (March 2025) vs OpenAI: GPT-5.6 Terra
Compare ChatGPT-4o (March 2025) and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 128K vs 1.1M, tested across 32 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
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.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
OpenAI: GPT-5.6 Terra
Input
$2.50
2.0× cheaper
Output
$15.00
Writing DNA
Style Comparison
Similarity
52%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
OpenAI: GPT-5.6 Terra
55%Vocabulary57%
24wSentence Length18w
0.52Hedging0.85
3.3Bold2.8
6.0Lists4.6
0.94Emoji0.00
0.63Headings1.12
0.05Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
