Claude Opus 5 (High) vs GPT-6 Luna (Low)
Which is better for the money: Claude Opus 5 (High) by Anthropic or GPT-6 Luna (Low) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
Claude Opus 5 (High) scores 26.6 points higher (48.1 vs 21.5) but costs 407× as much to run the benchmark ($4332 vs $10.6; flagship vs budget cost classes). They are not alternatives at one budget: pick Claude Opus 5 (High) when you need intelligence above 21.5, and GPT-6 Luna (Low) when 21.5 is enough.
| Metric | Claude Opus 5 (High) | GPT-6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 48.1 | 21.5 | −55.3% GPT-6 Luna (Low) is 55.3% less intelligent |
| Total AA cost (lower is better) | $4,331.68 | $10.63 | −99.8% GPT-6 Luna (Low) is 99.8% cheaper |
| End-to-end time (lower is better) | 26.50s | 7.32s | −72.4% GPT-6 Luna (Low) is 72.4% faster |
| Price per 1M tokens (in / out) | $5.00 / $25.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Low) vs Claude Opus 5 (High): 55.3% less intelligence, 99.8% less cost to run the AA benchmark, and 72.4% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Opus 5 (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
Claude Opus 5 (High)GPT-6 Luna (Low)Today's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-high/gpt-6-luna-low · Markdown: /api/v1/compare/claude-opus-5-high/gpt-6-luna-low?format=md · llms.txt · agent skill