GPT-5.1-Codex-Mini vs GPT-5.6 Terra
Compare GPT-5.1-Codex-Mini and GPT-5.6 Terra, both from OpenAI, context windows of 400K vs 1.1M, tested across 54 shared challenges.
Our Verdict
GPT-5.1-Codex-Mini
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
GPT-5.1-Codex-Mini
Input
$1.50
1.7× cheaper
Output
$6.00
2.5× cheaper
GPT-5.6 Terra
Input
$2.50
Output
$15.00
GPT-5.1-Codex-Mini is cheaper on both — 1.7× input, 2.5× output
Writing DNA
Style Comparison
Similarity
64%
GPT-5.6 Terra uses 14.5x more headings
GPT-5.1-Codex-Mini
GPT-5.6 Terra
65%Vocabulary57%
20wSentence Length18w
0.56Hedging0.85
3.3Bold2.8
3.4Lists4.6
0.00Emoji0.00
0.08Headings1.12
0.05Transitions0.06
Based on 13 + 27 text responses
Research
What we learned reading every model
FAQ
