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Claude Haiku 5.5 matches Luna's price through 100,000 tokens

simonwillison.net 3 min read Editor score 7/10

Haiku 5.5 costs $0.10/$0.50 per million input/output tokens up to 100,000 tokens, but uses about 1.25 times as many tokens for the same long prompt as Haiku 4.5. Above 100,000 tokens its price rises fivefold, making workload length important to serving cost.

What

- Claude Haiku 5.5 is Anthropic’s new fast, low-cost model.

How

- Its input/output price is $0.10/$0.50 per million tokens through 100,000 tokens, then $0.50/$2.50; its tokenizer uses about 1.25x as many tokens as Haiku 4.5.

Why it matters

- For long prompts, tokenizer overhead and the higher price tier affect cost comparisons; the excerpt describes Luna as a better deal above 100,000 tokens.

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