GPT-6 Luna (Medium) vs Muse Spark Open (Xhigh)
Which is better for the money: GPT-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 2026-10-24.
Trade-off
Verdict
Depends on your budget
Muse Spark Open (Xhigh) scores 9.0 points higher (38.9 vs 29.9) but costs 38× as much to run the benchmark ($1185 vs $31.2; premium vs budget cost classes). They are not alternatives at one budget: pick Muse Spark Open (Xhigh) when you need intelligence above 29.9, and GPT-6 Luna (Medium) when 29.9 is enough.
| Metric | GPT-6 Luna (Medium) | Muse Spark Open (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.9 | 38.9 | +30.1% Muse Spark Open (Xhig… is 30.1% more intelligent |
| Total AA cost (lower is better) | $31.17 | $1,184.90 | +3701.4% Muse Spark Open (Xhig… is 38× more expensive |
| End-to-end time (lower is better) | 8.25s | 17.34s | +110.2% Muse Spark Open (Xhig… is 110.2% slower |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $1.25 / $4.25 | |
| Input modalities | Text, Image | Text, Image, Speech, Video |
Muse Spark Open (Xhigh) vs GPT-6 Luna (Medium): 30.1% more intelligence, 3701.4% more cost to run the AA benchmark, and 110.2% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
- 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-6 Luna (Medium)Muse Spark Open (Xhigh)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-luna-medium/muse-spark-open · Markdown: /api/v1/compare/gpt-6-luna-medium/muse-spark-open?format=md · llms.txt · agent skill