Release date: 2026-10-07. This update is based on the vendor’s announcement and was added to the Worksflow.ai guide on October 11, 2026.
Anthropic announced Claude Haiku 5.5 on October 7, 2026, describing it as its fastest and least expensive current small model. The company highlights repetitive, high-volume tasks such as summaries, classification, customer support, and subagent work.
What the update means
For a high-volume workflow, compare quality and total cost on representative traffic, including difficult and ambiguous examples. Confirm the active model identifier, rate limits, and current terms in Anthropic’s platform documentation before routing live traffic.
What to verify before you update a workflow
- Confirm the exact model or product identifier in the vendor’s live documentation.
- Check whether the announcement describes a general release, preview, or restricted rollout.
- Test the same representative tasks, tool calls, and failure cases used in your current workflow.
- Record the vendor’s source and the date your team checked it.
Official sources
Details and availability can change after publication. Recheck the source before acting on this guide.