Claude Sonnet 5 (Low) vs GPT-6 Luna (Medium)
Which is better for the money: Claude Sonnet 5 (Low) by Anthropic or GPT-6 Luna (Medium) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Clear winner
Verdict
Pick GPT-6 Luna (Medium)
GPT-6 Luna (Medium) vs Claude Sonnet 5 (Low): 23.0% more intelligence, 95.2% less cost to run the AA benchmark, and end-to-end time not fully reported.
| Metric | Claude Sonnet 5 (Low) | GPT-6 Luna (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 24.3 | 29.9 | +23.0% GPT-6 Luna (Medium) is 23.0% more intelligent |
| Total AA cost (lower is better) | $652.70 | $31.17 | −95.2% GPT-6 Luna (Medium) is 95.2% cheaper |
| End-to-end time (lower is better) | 8.64s | Not reported | — not comparable |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
Against the frontier
- Claude Sonnet 5 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
- GPT-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
Claude Sonnet 5 (Low)GPT-6 Luna (Medium)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-sonnet-5-low/gpt-6-luna-medium · Markdown: /api/v1/compare/claude-sonnet-5-low/gpt-6-luna-medium?format=md · llms.txt · agent skill