Claude Tag moves to Fable 5.1 inside Slack for Team and Enterprise plans

Anthropic engineer Boris Cherny said Claude Tag, the version of Claude that responds when tagged inside Slack, now runs on Fable 5.1 for Team and Enterprise plans. In his demo, it assembles a leadership deck from a metrics spreadsheet and other data spread across Slack channels, and separately flags a vendor report whose numbers disagree with the rest before moving on, rather than merging the conflicting figures into the output unremarked.

Claude Tag has separately been described by Anthropic's own team pulling metrics and diffing deploys during on-call incident triage, a different use case that shows the same tagged-response pattern applied to operations rather than document assembly.