Fable 5.1 becomes the default Fable model; repo-level bypass mode is ignored

What changed

Version 2.1.257 adds claude-fable-5-1 as the default Fable model, with 1M context at $10 / $50 per million tokens and $0.25 per million for cache reads; gateway sessions keep pointing at Fable 5 until gateways support 5.1. A defaultMode of bypassPermissions set in a repository’s .claude settings files is now ignored, as auto already was, and –add-dir and additionalDirectories refuse network paths such as UNC shares.

Who it affects

Fable users, gateway admins, and teams that set permission modes in repo settings.

What to do

Move any bypass-permissions setting to user or managed settings, or pass –permission-mode explicitly.

Source: https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md