Anthropic · Small Frontier Model

Claude Haiku 5.5

Anthropic's fastest model, released 7 October after Claude Opus 5.5 (week 40) and Sonnet 5.5 (week 41), and the first Haiku with effort levels. API pricing is $0.10 input and $0.50 output per million tokens for prompts up to 100K tokens, a tenth of Haiku 4.5's $1 and $5, rising to $0.50 and $2.50 above that. Against Haiku 4.5, Anthropic reports 72.4% on OSWorld versus 15.7%, 39.2% on Terminal-Bench versus 0.0%, and 1,620 versus 735 on GDPval-AA, all vendor-reported. Anthropic still recommends Sonnet 5.5 and Opus 5.5 for complex agentic coding and positions Haiku for narrow tasks and subagent work. Available on the Claude Platform, AWS, Google Cloud and Azure as claude-haiku-5-5.