Claude Opus 5.5 (Xhigh, Default Fallback) vs GPT-6 Luna (High)
Which is better for the money: Claude Opus 5.5 (Xhigh, Default Fallback) by Anthropic or GPT-6 Luna (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
Claude Opus 5.5 (Xhigh, Default Fallbac… scores 23.1 points higher (56.0 vs 32.9) but costs 85× as much to run the benchmark ($4057 vs $47.9; flagship vs budget cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Xhigh, Default Fallbac… when you need intelligence above 32.9, and GPT-6 Luna (High) when 32.9 is enough.
| Metric | Claude Opus 5.5 (Xhigh, Default Fallback) | GPT-6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 56.0 | 32.9 | −41.3% GPT-6 Luna (High) is 41.3% less intelligent |
| Total AA cost (lower is better) | $4,056.65 | $47.85 | −98.8% GPT-6 Luna (High) is 98.8% cheaper |
| End-to-end time (lower is better) | 149.28s | 18.45s | −87.6% GPT-6 Luna (High) is 87.6% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (High) vs Claude Opus 5.5 (Xhigh, Default Fallback): 41.3% less intelligence, 98.8% less cost to run the AA benchmark, and 87.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Opus 5.5 (Xhigh, Default Fallback) is on today's frontier: nothing is both smarter and cheaper.
- GPT-6 Luna (High) is on today's frontier: nothing is both smarter and cheaper.
Claude Opus 5.5 (Xhigh, Default Fallback)GPT-6 Luna (High)Today's Pareto frontierEvery other model
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