Claude Code 2.1.283 lets admins pin exact model versions with availableModelsMatch and deniedModels, and moves prompt-audit into /doctor
Version 2.1.283, released 25 Sep, adds an availableModelsMatch "exact" managed setting. With it, an availableModels entry allows only the version it names, so new model releases stay blocked until someone lists them, and a new deniedModels setting blocks specific models outright. /doctor prompt-audit now checks CLAUDE.md files, skills, agents and commands for patterns written for older models, and it lists stale paths, stale commands and contradicting instruction files first. Two behavior changes matter for unattended runs. Managed sandbox settings with one invalid nested value used to be ignored entirely and now fail closed for that value only. Interactive sessions on third-party providers or with telemetry off now start in auto mode when no permission mode is configured, so set permissions.defaultMode explicitly if you rely on prompts.
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