GPT-5.1 vs OpenAI: GPT-5.6 Terra
Compare GPT-5.1 and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 400K vs 1.1M, tested across 51 shared challenges.
Our Verdict
GPT-5.1
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
GPT-5.1
Input
$1.25
2.0× cheaper
Output
$10.00
1.5× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
GPT-5.1 is cheaper on both — 2.0× input, 1.5× output
Writing DNA
Style Comparison
Similarity
62%
OpenAI: GPT-5.6 Terra uses 3.0x more hedging
GPT-5.1
OpenAI: GPT-5.6 Terra
62%Vocabulary57%
19wSentence Length18w
0.29Hedging0.85
3.5Bold2.8
7.2Lists4.6
0.00Emoji0.00
0.61Headings1.12
0.03Transitions0.06
Based on 14 + 27 text responses
Research
What we learned reading every model
FAQ
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