LaunchDevelopersSeptember 1, 2026

Claude Code 2.1.258 fixes macOS 12 launch regression

Claude Code 2.1.258 fixes a regression from 2.1.255 that prevented launch on macOS 12 (Monterey), and resolves remote/scheduled session errors. It also adds Claude Fable 5.1 as the default Fable model with 1M context.

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