GPT-5.1vsMuse Spark 1.3 Contributor
Muse Spark 1.3 Contributor is cheaper than GPT-5.1 at $0.1/M vs $1.25/M input tokens.
| Spec | GPT-5.1 | 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 | 400K tokens | 1.0M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Sep 2026 |
Our Verdict
GPT-5.1
Muse Spark 1.3 Contributor
Not enough votes to call it. On the specs, nothing separates them.
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
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
3 hosts
Muse Spark 1.3 Contributor1 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Sep 2026.
Writing DNA
Style Comparison
Similarity
48%
GPT-5.1 uses 3.1x more lists
GPT-5.1
Muse Spark 1.3 Contributor
62%Vocabulary58%
19wSentence Length13w
0.29Hedging0.27
3.5Bold2.8
7.2Lists2.3
0.00Emoji0.00
0.61Headings0.44
0.03Transitions0.02
Based on 14 + 27 text responses
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