GPT-6 Astra (Medium) vs GPT-6 Luna (Low)
Which is better for the money: GPT-6 Astra (Medium) by OpenAI or GPT-6 Luna (Low) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-28.
Trade-off
Verdict
Depends on your budget
GPT-6 Astra (Medium) scores 41.8 points higher (51.5 vs 9.7) but costs 290× as much to run the benchmark ($2638 vs $9.09; flagship vs budget cost classes). They are not alternatives at one budget: pick GPT-6 Astra (Medium) when you need intelligence above 9.7, and GPT-6 Luna (Low) when 9.7 is enough.
| Metric | GPT-6 Astra (Medium) | GPT-6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.5 | 9.7 | −81.2% GPT-6 Luna (Low) is 81.2% less intelligent |
| Total AA cost (lower is better) | $2,638.29 | $9.09 | −99.7% GPT-6 Luna (Low) is 99.7% cheaper |
| End-to-end time (lower is better) | 13.60s | 6.72s | −50.6% GPT-6 Luna (Low) is 50.6% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Low) vs GPT-6 Astra (Medium): 81.2% less intelligence, 99.7% less cost to run the AA benchmark, and 50.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6 Astra (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 54.50 for $1124.
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
GPT-6 Astra (Medium)GPT-6 Luna (Low)Today's Pareto 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-astra-medium/gpt-6-luna-low · Markdown: /api/v1/compare/gpt-6-astra-medium/gpt-6-luna-low?format=md · llms.txt · agent skill