Claude Haiku 5.5 is the newest model in Anthropic's fast Haiku line, built for quick, high-volume work. On Magnus it is the one to pick when you want replies to start fast and your credits to go far.
Released October 7, 2026 by Anthropic. Haiku 5.5 has a 1M-token context window and adaptive thinking - the model decides how much to think before it answers. It is the lowest-priced Claude model: from $0.10 per million input tokens and $0.50 per million output tokens.
On the All-inclusive plan a Haiku 5.5 reply costs 1 credit, the same as Haiku 4.5.
Voice conversations, everyday chat, quick-fire agents and busy days where credits matter. It runs the full Claude toolset - integrations, web search, PDFs - so a fast model does not mean a stripped-down one.