Anthropic's Workbench moves into a new Build section

Anthropic has revamped Workbench and moved it into a new Build section with a redesigned interface. You can send a request to the Messages API, see Claude's response, and copy the code. Claude Fable 5 now supports configuring a fallback model.
Claude Managed Agents also gains an Observability tab that tracks token spend, error rates, and other metrics.
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