OpenAI: GPT-5.6 Luna Pro vs Seed 2.0 Lite
Compare OpenAI: GPT-5.6 Luna Pro by OpenAI against Seed 2.0 Lite by ByteDance, context windows of 1.1M vs 262K, tested across 53 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna Pro
Seed 2.0 LiteRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Luna Pro has the edge — newer, bigger context window, major provider backing.
Seed 2.0 Lite is 3.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Seed 2.0 Lite
Input
$0.25
4.0× cheaper
Output
$2.00
3.0× cheaper
Seed 2.0 Lite is cheaper on both — 4.0× input, 3.0× output
Writing DNA
Style Comparison
Similarity
47%
OpenAI: GPT-5.6 Luna Pro uses 53.7x more emoji
OpenAI: GPT-5.6 Luna Pro
Seed 2.0 Lite
58%Vocabulary53%
18wSentence Length31w
0.81Hedging0.28
2.9Bold0.9
5.1Lists1.7
0.54Emoji0.00
1.10Headings1.27
0.09Transitions0.05
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
