Claude Sonnet 5 (Medium) vs GPT-5.6 Luna (Xhigh)
Which is better for the money: Claude Sonnet 5 (Medium) by Anthropic or GPT-5.6 Luna (Xhigh) 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-5.6 Luna (Xhigh)
GPT-5.6 Luna (Xhigh) vs Claude Sonnet 5 (Medium): 23.1% more intelligence, 85.3% less cost to run the AA benchmark, and 392.5% slower end-to-end.
| Metric | Claude Sonnet 5 (Medium) | GPT-5.6 Luna (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 28.1 | 34.6 | +23.1% GPT-5.6 Luna (Xhigh) is 23.1% more intelligent |
| Total AA cost (lower is better) | $1,218.17 | $179.33 | −85.3% GPT-5.6 Luna (Xhigh) is 85.3% cheaper |
| End-to-end time (lower is better) | 9.30s | 45.80s | +392.5% GPT-5.6 Luna (Xhigh) is 392.5% slower |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
Against the frontier
- Claude Sonnet 5 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Terra (Medium) scores 41.30 for $175.
Claude Sonnet 5 (Medium)GPT-5.6 Luna (Xhigh)Today's Pareto frontierEvery other model
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-sonnet-5-medium/gpt-5-6-luna-xhigh · Markdown: /api/v1/compare/claude-sonnet-5-medium/gpt-5-6-luna-xhigh?format=md · llms.txt · agent skill