GPT-5.4 Pro vs GPT-5.6 Terra
Compare GPT-5.4 Pro and GPT-5.6 Terra, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
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.
GPT-5.6 Terra is 12x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Pro
Input
$30.00
Output
$180.00
GPT-5.6 Terra
Input
$2.50
12× cheaper
Output
$15.00
12× cheaper
GPT-5.6 Terra is cheaper on both — 12× input, 12× output
Writing DNA
Style Comparison
Similarity
74%
GPT-5.6 Terra uses 5.6x more transitions
GPT-5.4 Pro
GPT-5.6 Terra
50%Vocabulary57%
35wSentence Length18w
0.70Hedging0.85
7.5Bold2.8
8.3Lists4.6
0.00Emoji0.00
2.52Headings1.12
0.01Transitions0.06
Based on 12 + 27 text responses
Research
What we learned reading every model
FAQ
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