Claude Haiku 5.5
Simon Willison’s Weblog 4 hours ago ● 5 sources
Anthropic released Claude Haiku 5.5 as a faster, lower-cost model and adjusted its pricing and tokenizer compared with Haiku 4.5. It is priced at $0.10 per million input tokens and $0.50 per million output tokens up to 100,000 tokens, then rises 5x beyond that. Pricing becomes similar to GPT-6 Luna only within 100,000 tokens, while long prompts cost more due to a less generous tokenizer, and Anthropic also halved cache-read prices and added monthly API credits for subscribers (with non-rollover credits).