Claude Opus 5.5 (Max, Default Fallback) vs GPT-6 Luna (Low)
Which is better for the money: Claude Opus 5.5 (Max, Default Fallback) by Anthropic or GPT-6 Luna (Low) by OpenAI? 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
Claude Opus 5.5 (Max, Default Fallback) scores 36.1 points higher (57.6 vs 21.5) but costs 819× as much to run the benchmark ($8708 vs $10.6; flagship vs budget cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Max, Default Fallback) when you need intelligence above 21.5, and GPT-6 Luna (Low) when 21.5 is enough.
| Metric | Claude Opus 5.5 (Max, Default Fallback) | GPT-6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 57.6 | 21.5 | −62.7% GPT-6 Luna (Low) is 62.7% less intelligent |
| Total AA cost (lower is better) | $8,708.20 | $10.63 | −99.9% GPT-6 Luna (Low) is 99.9% cheaper |
| End-to-end time (lower is better) | 626.13s | 6.60s | −98.9% GPT-6 Luna (Low) is 98.9% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Low) vs Claude Opus 5.5 (Max, Default Fallback): 62.7% less intelligence, 99.9% less cost to run the AA benchmark, and 98.9% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Opus 5.5 (Max, Default Fallback) is on today's frontier: nothing is both smarter and cheaper.
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
Claude Opus 5.5 (Max, Default Fallback)GPT-6 Luna (Low)Today's Pareto frontierEvery other model
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