Claude Haiku 5.5 (Medium) vs GPT-5.6 Luna (Xhigh)
Which is better for the money: Claude Haiku 5.5 (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 2026-10-27.
Trade-off
Verdict
Depends on your budget
GPT-5.6 Luna (Xhigh) scores 0.1 points higher (34.6 vs 34.5) but costs 3.2× as much to run the benchmark ($179 vs $56.4; both mid-range class). They are not alternatives at one budget: pick GPT-5.6 Luna (Xhigh) when you need intelligence above 34.5, and Claude Haiku 5.5 (Medium) when 34.5 is enough.
| Metric | Claude Haiku 5.5 (Medium) | GPT-5.6 Luna (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.5 | 34.6 | +0.3% GPT-5.6 Luna (Xhigh) is 0.3% more intelligent |
| Total AA cost (lower is better) | $56.36 | $179.33 | +218.2% GPT-5.6 Luna (Xhigh) is 3.2× more expensive |
| End-to-end time (lower is better) | 15.74s | 39.18s | +148.9% GPT-5.6 Luna (Xhigh) is 148.9% slower |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Luna (Xhigh) vs Claude Haiku 5.5 (Medium): 0.3% more intelligence, 218.2% more cost to run the AA benchmark, and 148.9% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Haiku 5.5 (Medium) is on today's frontier: nothing is both smarter and cheaper.
- 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 Haiku 5.5 (Medium)GPT-5.6 Luna (Xhigh)Today's Pareto frontierEvery other model
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