The model picker no longer lists Claude Haiku 4.5, the previous Haiku version. Haiku 5.5 is the only Haiku. Anyone who had saved Haiku 4.5 as their model, on a board, a board default or an agent, is moved onto Claude Haiku 5.5 with no action needed and sees no error. Haiku 5.5 costs less than Haiku 4.5: $0.10 per million input tokens against $1.00.