Group of 2 Under the hood
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The gate controlling whether the fable model is added to opus and haiku lists was renamed from fable5 to fable51.
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().
Names in the bundlefable51