GPT-5.1 ChatvsMuse Spark 1.3 Contributor
Muse Spark 1.3 Contributor is cheaper than GPT-5.1 Chat at $0.1/M vs $1.25/M input tokens.
| Spec | GPT-5.1 Chat | Muse Spark 1.3 Contributor |
|---|---|---|
| Input price | $1.25/M tokens | $0.1/M tokens |
| Output price | $10/M tokens | $0.2/M tokens |
| Context window | 128K tokens | 1.0M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Sep 2026 |
Our Verdict
Muse Spark 1.3 Contributor
GPT-5.1 ChatRunner-up
Not enough votes to call it. On the specs, Muse Spark 1.3 Contributor has the edge: newer, bigger context window.
Muse Spark 1.3 Contributor costs 50x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-5.1 Chat
Input
$1.25
Output
$10.00
Muse Spark 1.3 Contributor
Input
$0.10
13× cheaper
Output
$0.20
50× cheaper
Muse Spark 1.3 Contributor is cheaper on both: 13× input, 50× output.
Where to run it
1 host
GPT-5.1 Chat
No hosts listed on OpenRouter.
Muse Spark 1.3 Contributor1 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
54%
Muse Spark 1.3 Contributor uses 44.2x more headings
GPT-5.1 Chat
Muse Spark 1.3 Contributor
73%Vocabulary58%
18wSentence Length13w
0.45Hedging0.27
1.1Bold2.8
2.4Lists2.3
0.00Emoji0.00
0.00Headings0.44
0.06Transitions0.02
Based on 15 + 27 text responses
Research
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