GPT-5.2vsMuse Spark 1.3
Muse Spark 1.3 is cheaper than GPT-5.2 at $1.25/M vs $1.75/M input tokens.
| Spec | GPT-5.2 | Muse Spark 1.3 |
|---|---|---|
| Input price | $1.75/M tokens | $1.25/M tokens |
| Output price | $14/M tokens | $4.25/M tokens |
| Context window | 400K tokens | 1.0M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Dec 2025 | Sep 2026 |
Our Verdict
GPT-5.2
Muse Spark 1.3
Not enough votes to call it. On the specs, nothing separates them.
Muse Spark 1.3 costs 3.3x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-5.2
Input
$1.75
Output
$14.00
Muse Spark 1.3
Input
$1.25
1.4× cheaper
Output
$4.25
3.3× cheaper
Muse Spark 1.3 is cheaper on both: 1.4× input, 3.3× output.
Where to run it
3 hosts
Muse Spark 1.31 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
39%
GPT-5.2 uses 5.8x more emoji
GPT-5.2
Muse Spark 1.3
64%Vocabulary59%
16wSentence Length14w
0.34Hedging0.28
9.4Bold2.6
3.9Lists2.3
0.06Emoji0.00
0.89Headings0.48
0.31Transitions0.02
Based on 15 + 27 text responses
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