Compare · updated 2026-11-01
GPT-6 Luna vs Muse Spark
GPT-6 Luna is better at quick answers, writing, coding, structured data, translation; Muse Spark is better at reasoning, maths, long documents. GPT-6 Luna is the cheaper of the two on output.
Measured quality by task
| Task | GPT-6 Luna | Muse Spark | Better |
|---|---|---|---|
| Quick answers | 93/100 | 89/100 | GPT-6 Luna |
| Writing | 90/100 | 86/100 | GPT-6 Luna |
| Coding | 84/100 | 84/100 | GPT-6 Luna |
| Reasoning | 77/100 | 83/100 | Muse Spark |
| Maths | 70/100 | 80/100 | Muse Spark |
| Structured data | 93/100 | 88/100 | GPT-6 Luna |
| Long documents | 88/100 | 90/100 | Muse Spark |
| Translation | 90/100 | 89/100 | GPT-6 Luna |
Quality is Nivana’s measured score for each kind of task, from weekly pairwise evals judged by models from several labs. Prices are live AI Gateway list prices per million tokens. Updated 2026-11-01. How this is measured.
Price and context
| GPT-6 Luna | Muse Spark | |
|---|---|---|
| Lab | OpenAI | Meta |
| Input per 1M tokens | $0.1 | $1.25 |
| Output per 1M tokens | $0.5 | $4.25 |
| Typical chat answer | $0.00050 | $0.00485 |
| Context window | 1.05M | 1.05M |
| Router picks it for | 16 of 24 request types | Fallback only |
Which should you use?
Use the one that wins the kind of work you do most, unless the price gap outweighs the quality gap for easy requests. Or don’t choose: Nivana scores both, and the rest of the pool, on every request and sends it to whichever is best for that request.
Questions
Is GPT-6 Luna better than Muse Spark?
On Nivana’s weekly evals GPT-6 Luna scores higher on 5 of 8 task types (quick answers, writing, coding, structured data, translation) and Muse Spark on 3 (reasoning, maths, long documents). Neither is better at everything.
Which is better for coding, GPT-6 Luna or Muse Spark?
GPT-6 Luna: 84/100 against 84/100 for Muse Spark on Nivana’s coding evals.
Which is better for writing, GPT-6 Luna or Muse Spark?
GPT-6 Luna: 90/100 against 86/100 for Muse Spark on Nivana’s writing evals.
Which is cheaper, GPT-6 Luna or Muse Spark?
GPT-6 Luna: $0.5 per million output tokens against $4.25 for Muse Spark, about 8.5× less. A typical chat answer costs about $0.0005 on GPT-6 Luna and $0.0049 on Muse Spark.
Or let the router pick, per request
Nivana sends every message to the model that scores best for it, sets how hard it thinks, and tells you which one answered. 2,000 free credits to start, no card.