Claude Haiku 5.5 (Medium) vs GPT-5.6 Luna (Low)
Which is better for the money: Claude Haiku 5.5 (Medium) by Anthropic or GPT-5.6 Luna (Low) 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
Claude Haiku 5.5 (Medium) scores 13.5 points higher (34.5 vs 21.0) but costs 2.1× as much to run the benchmark ($56.4 vs $27.0; mid-range vs budget cost classes). Pick Claude Haiku 5.5 (Medium) when the extra intelligence is worth the premium, otherwise GPT-5.6 Luna (Low).
| Metric | Claude Haiku 5.5 (Medium) | GPT-5.6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.5 | 21.0 | −39.1% GPT-5.6 Luna (Low) is 39.1% less intelligent |
| Total AA cost (lower is better) | $56.36 | $27.02 | −52.1% GPT-5.6 Luna (Low) is 52.1% cheaper |
| End-to-end time (lower is better) | 15.74s | 5.68s | −63.9% GPT-5.6 Luna (Low) is 63.9% faster |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Luna (Low) vs Claude Haiku 5.5 (Medium): 39.1% less intelligence, 52.1% less cost to run the AA benchmark, and 63.9% faster 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 (Low) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
Claude Haiku 5.5 (Medium)GPT-5.6 Luna (Low)Today's Pareto frontierEvery other model
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