GPT-5.3 Chat vs Meta: Muse Spark 1.1
Compare GPT-5.3 Chat by OpenAI against Meta: Muse Spark 1.1 by Meta AI, context windows of 128K vs 1.0M, tested across 53 shared challenges.
Our Verdict
Meta: Muse Spark 1.1
GPT-5.3 ChatRunner-up
No community votes yet. On paper, Meta: Muse Spark 1.1 has the edge — newer, bigger context window.
Meta: Muse Spark 1.1 is 3.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
Output
$14.00
Meta: Muse Spark 1.1
Input
$1.25
1.4× cheaper
Output
$4.25
3.3× cheaper
Meta: Muse Spark 1.1 is cheaper on both — 1.4× input, 3.3× output
Writing DNA
Style Comparison
Similarity
33%
GPT-5.3 Chat
Meta: Muse Spark 1.1
59%Vocabulary61%
26wSentence Length20w
0.84Hedging0.10
1.7Bold3.7
6.6Lists2.0
0.00Emoji0.01
0.00Headings0.52
0.25Transitions0.02
Based on 23 + 29 text responses
Research
What we learned reading every model
FAQ
