GPT-6 Luna vs Muse Spark Open
Price, context window & benchmark comparison
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Compare different models
Verdict: GPT-6 Luna is 10.0× cheaper than Muse Spark Open on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 1M).
| GPT-6 Luna | Muse Spark Open | |
|---|---|---|
| Input price / 1M | $0.10 | $1.25 |
| Output price / 1M | $0.50 | $4.25 |
| Blended price (3:1) | $0.20 | $2.00 |
| Cached input / 1M | $0.01 | $0.15 |
| Context window | 1.1M | 1M |
| Max output | 128K | 131K |
| Intelligence index | 27.8 | — |
| Coding index | — | — |
| Providers | 7 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2026-10-15 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-6 Luna or Muse Spark Open?
GPT-6 Luna is 10.0× cheaper than Muse Spark Open on a typical 3:1 input/output mix.
GPT-6 Luna vs Muse Spark Open: which has a bigger context window?
GPT-6 Luna: 1,050,000 tokens. Muse Spark Open: 1,048,576 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Muse Spark Open ≈ $4,625.
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