Introducing Claude Haiku 5.5 simonwillison.net Breaking

Anthropic released Claude Haiku 5.5 at $0.10 per million input tokens and $0.50 per million output tokens for prompts up to 100,000 tokens, with rates five times higher above that; blogger Simon Willison notes its tokenizer uses about 25% more tokens than Haiku 4.5. Anthropic also halved Sonnet 5.5 cache-read prices and announced monthly API credits of up to $100 for Max 5x, $200 for Max 20x, and $500 pooled for Team subscribers; credits expire monthly.