Anthropic has launched Claude Haiku 5.5, which it calls the cheapest, fastest and most capable small model it has ever released.

Released on October 7, the model costs $0.10 per million input tokens and $0.50 per million output tokens for prompts up to 100,000 tokens, about 90% less per token than Haiku 4.5.

It keeps a 1 million token context window and up to 128,000 output tokens, and is the first Haiku with an adjustable effort setting for reasoning.

Anthropic says it runs around 75% cheaper on average than Haiku 4.5, since about 90% of requests to the older model stayed under 100,000 tokens.

The model is available on the Claude API, Amazon Bedrock, Google Cloud and Microsoft Foundry, and targets high-volume work like summaries, classification and subagents.

The launch completes Anthropic's three-model Claude 5.5 lineup after Opus 5.5 and Sonnet 5.5.