GPT-5.6 Luna (Medium) vs Muse Spark Open (Xhigh)
Which is better for the money: GPT-5.6 Luna (Medium) by OpenAI or Muse Spark Open (Xhigh) by Meta? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
Muse Spark Open (Xhigh) scores 13.9 points higher (38.9 vs 25.0) but costs 27× as much to run the benchmark ($1185 vs $44.3; premium vs budget cost classes). They are not alternatives at one budget: pick Muse Spark Open (Xhigh) when you need intelligence above 25.0, and GPT-5.6 Luna (Medium) when 25.0 is enough.
| Metric | GPT-5.6 Luna (Medium) | Muse Spark Open (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 25.0 | 38.9 | +55.6% Muse Spark Open (Xhig… is 55.6% more intelligent |
| Total AA cost (lower is better) | $44.32 | $1,184.90 | +2573.5% Muse Spark Open (Xhig… is 27× more expensive |
| End-to-end time (lower is better) | 6.11s | 16.47s | +169.6% Muse Spark Open (Xhig… is 169.6% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $1.25 / $4.25 | |
| Input modalities | Text, Image | Text, Image, Speech, Video |
Muse Spark Open (Xhigh) vs GPT-5.6 Luna (Medium): 55.6% more intelligence, 2573.5% more cost to run the AA benchmark, and 169.6% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Medium) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
- Muse Spark Open (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.6 Luna (Medium)Muse Spark Open (Xhigh)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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