Claude Opus 5.5 (Medium, Default Fallback) vs GPT-6 Luna (Non-reasoning)
Which is better for the money: Claude Opus 5.5 (Medium, Default Fallback) by Anthropic or GPT-6 Luna (Non-reasoning) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Depends on your budget
Claude Opus 5.5 (Medium, Default Fallba… scores 32.7 points higher (51.2 vs 18.5) but costs 85× as much to run the benchmark ($1627 vs $19.2; premium vs budget cost classes). They are not alternatives at one budget: pick Claude Opus 5.5 (Medium, Default Fallba… when you need intelligence above 18.5, and GPT-6 Luna (Non-reasoning) when 18.5 is enough.
| Metric | Claude Opus 5.5 (Medium, Default Fallback) | GPT-6 Luna (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.2 | 18.5 | −63.9% GPT-6 Luna (Non-reaso… is 63.9% less intelligent |
| Total AA cost (lower is better) | $1,626.81 | $19.16 | −98.8% GPT-6 Luna (Non-reaso… is 98.8% cheaper |
| End-to-end time (lower is better) | 25.34s | 5.09s | −79.9% GPT-6 Luna (Non-reaso… is 79.9% faster |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Non-reasoning) vs Claude Opus 5.5 (Medium, Default Fallback): 63.9% less intelligence, 98.8% less cost to run the AA benchmark, and 79.9% faster end-to-end.
Against the frontier
- Claude Opus 5.5 (Medium, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GPT-6 Luna (Non-reasoning) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-opus-5-5-medium/gpt-6-luna-non-reasoning · Markdown: /api/v1/compare/claude-opus-5-5-medium/gpt-6-luna-non-reasoning?format=md · llms.txt · agent skill