Gemini 2.5 Flash Preview (thinking) vs OpenAI: GPT-5.6 Terra
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against OpenAI: GPT-5.6 Terra by OpenAI, context windows of 1.0M vs 1.1M, tested across 20 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
Gemini 2.5 Flash Preview (thinking)Runner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview (thinking) is 4.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
14× cheaper
Output
$3.50
4.3× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 14× input, 4.3× output
Writing DNA
Style Comparison
Similarity
34%
OpenAI: GPT-5.6 Terra uses 112.3x more headings
Gemini 2.5 Flash Preview (thinking)
OpenAI: GPT-5.6 Terra
53%Vocabulary57%
14wSentence Length18w
0.38Hedging0.85
4.4Bold2.8
4.1Lists4.6
0.00Emoji0.00
0.00Headings1.12
0.24Transitions0.06
Based on 7 + 27 text responses
Research
What we learned reading every model
FAQ
