GPT-5.3-Codex vs Meta: Muse Spark 1.1
Compare GPT-5.3-Codex by OpenAI against Meta: Muse Spark 1.1 by Meta AI, context windows of 400K vs 1.0M, tested across 53 shared challenges.
Our Verdict
GPT-5.3-Codex
Meta: Muse Spark 1.1
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
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-Codex
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
34%
GPT-5.3-Codex uses 15.8x more emoji
GPT-5.3-Codex
Meta: Muse Spark 1.1
65%Vocabulary61%
23wSentence Length20w
0.51Hedging0.10
6.5Bold3.7
6.2Lists2.0
0.16Emoji0.01
1.90Headings0.52
0.03Transitions0.02
Based on 23 + 29 text responses
Research
What we learned reading every model
FAQ
