Nothing to try yetTier: how much it should matter to you
4Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ModelsArea: what it touches
Internal ChangesKind: in v2.1.257,
What probably matters to youSection of the release
A new model id claude-fable-5-1 and its Vertex region constant VERTEX_REGION_CLAUDE_FABLE_5_1 were added. The opus/haiku fallback-list builders now check feature gate fable51 (replacing the previous fable5 check) before appending the model via WZe().
