Haiku 5.5 costs 75% less than Haiku 4.5, supports effort controls for cost-vs-intelligence tuning, and runs as subagents paired with Opus 5.5 for hierarchical workflows.
Summary
Enables cost-effective scaling of repetitive tasks (classification, routing, code review, document summarization) without sacrificing multi-step tool use or computer-use capabilities. Effort controls let you tune inference budgets per task instead of picking one setting for entire workloads.
Why it matters
Enables cost-effective scaling of repetitive tasks (classification, routing, code review, document summarization) without sacrificing multi-step tool use or computer-use capabilities. Effort controls let you tune inference budgets per task instead of picking one setting for entire workloads.
Implementation verdict
Replaces Haiku 4.5 for volume work; requires AWS account with Bedrock access, Boto3/Anthropic SDK, and IAM permissions (bedrock:InvokeModel). Ready now—three invocation paths available (Boto3 InvokeModel, Converse API, Anthropic SDK via bedrock-runtime). Start with Bedrock Playground, then move to code.
Sources
Dev Signal
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