Muse Spark 1.3vsGPT-1
Muse Spark 1.3 has a larger context window than GPT-1 (1.0M tokens vs 1K tokens).
| Spec | Muse Spark 1.3 | GPT-1 |
|---|---|---|
| Input price | $1.25/M tokens | — |
| Output price | $4.25/M tokens | — |
| Context window | 1.0M tokens | 1K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | — |
| Released | Sep 2026 | Jun 2018 |
Our Verdict
Muse Spark 1.3
GPT-1Runner-up
Not enough votes to call it. On the specs, Muse Spark 1.3 has the edge: bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
Muse Spark 1.3
Input
$1.25
Output
$4.25
GPT-1
Input
—
Output
—
Where to run it
1 host
Muse Spark 1.31 host
GPT-1
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
64%
Muse Spark 1.3 uses 258.0x more bold
Muse Spark 1.3
GPT-1
59%Vocabulary65%
14wSentence Length14w
0.28Hedging0.27
2.6Bold0.0
2.3Lists0.3
0.00Emoji0.00
0.48Headings0.00
0.02Transitions0.41
Based on 27 + 7 text responses
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