Anthropic launches Claude Haiku 5.5, a fast and low-cost model

Anthropic has released Claude Haiku 5.5, the latest version of its fast, low-cost model line, following a timeline the company previously indicated when it released Claude Sonnet 5.5 in late September. The announcement appeared on Anthropic’s website under the title “Introducing Claude Haiku 5.5,” according to the summary compiled by Simon Willison, who covered the release on his blog on October 7.

Willison noted that the prior version, Claude Haiku 4.5, had been showing its age. That model was released nearly a year earlier, in October of the previous year, and was priced at $1 per million input tokens and $5 per million output tokens. Willison characterized that pricing as relatively expensive even at the time of Haiku 4.5’s release.

The available material does not specify the pricing, benchmarks, or technical details of the new Haiku 5.5 release itself. It is presented as part of a progression in Anthropic’s model lineup, arriving after the Sonnet 5.5 release that Willison had flagged weeks earlier as a signal that a new Haiku model was forthcoming.

Further specifics on Haiku 5.5’s capabilities or cost structure were not included in the excerpted source material reviewed for this bulletin.