Anthropic released Claude Haiku 5.5: the cheapest, fastest, and most capable small model

On average, it costs around 75% less to run than Claude Haiku 4.5.

Haiku 5.5 is designed for high-volume, cost-sensitive tasks. It reliably handles repetitive work like summaries and classification, and pairs well with Claude Opus 5.5 and Sonnet 5.5 as a subagent on coding work.

It’s also fast enough for live customer support and browser use.

Haiku 5.5 is first Haiku model with an adjustable effort setting, so you can decide whether to optimize for cost or intelligence on each task.