GPT-4.5 vs OpenAI: GPT-5.6 Terra
Compare GPT-4.5 and OpenAI: GPT-5.6 Terra, both from OpenAI, context windows of 128K vs 1.1M, tested across 24 shared challenges.
Our Verdict
GPT-4.5
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.
OpenAI: GPT-5.6 Terra is 10x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.5
Input
$75.00
Output
$150.00
OpenAI: GPT-5.6 Terra
Input
$2.50
30× cheaper
Output
$15.00
10× cheaper
OpenAI: GPT-5.6 Terra is cheaper on both — 30× input, 10× output
Writing DNA
Style Comparison
Similarity
61%
GPT-4.5 uses 9.5x more transitions
GPT-4.5
OpenAI: GPT-5.6 Terra
63%Vocabulary57%
16wSentence Length18w
0.57Hedging0.85
4.7Bold2.8
6.4Lists4.6
0.00Emoji0.00
1.30Headings1.12
0.54Transitions0.06
Based on 11 + 27 text responses
Research
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