Claude Opus 4.6 vs OpenAI: GPT-5.6 Terra
Compare Claude Opus 4.6 by Anthropic against OpenAI: GPT-5.6 Terra by OpenAI, context windows of 1.0M vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Opus 4.6
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
Claude Opus 4.6
Input
$5.00
Output
$25.00
OpenAI: GPT-5.6 Terra
Input
$2.50
2.0× cheaper
Output
$15.00
1.7× cheaper
OpenAI: GPT-5.6 Terra is cheaper on both — 2.0× input, 1.7× output
Writing DNA
Style Comparison
Similarity
53%
Claude Opus 4.6 uses 20.7x more emoji
Claude Opus 4.6
OpenAI: GPT-5.6 Terra
53%Vocabulary57%
35wSentence Length18w
0.68Hedging0.85
5.2Bold2.8
2.9Lists4.6
0.21Emoji0.00
1.34Headings1.12
0.03Transitions0.06
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
