Claude Code 2.1.257
Added Claude Fable 5.1 (claude-fable-5-1), now the default Fable model — 1M context, 0/$50 per Mtok with $0.25/Mtok cache reads Added "Time format"…
Claude Code 2.1.257 makes Claude Fable 5.1 (claude-fable-5-1) the default Fable model, with a 1M-token context window and cache reads priced at $0.25/Mtok. The release also adds several settings and a new safety rule:
- A "Time format" setting and a time zone setting let the turn-end clock and transcript-view timestamps use 12-hour, 24-hour, 24-hour UTC, or a custom strftime pattern.
- Auto mode gets a Containment Escape rule: cloud metadata-credential fetches, egress evasion, and cross-tenant reach are no longer auto-approved unless the environment marks them expected.
- A new CLAUDE_CODE_SUBAGENT_MODEL_FORCE environment variable applies CLAUDE_CODE_SUBAGENT_MODEL, or the main model, to every subagent, overriding per-spawn and agent-definition model choices.
- "/effort s" changes the effort level for the current session only, matching how "/model" already works.
- "/doctor" now warns about stale sandbox mask files left behind by a killed session.
- Auto mode now asks once, before the first file read outside the working directories, with an option to block such reads entirely via the permissions.blockReadsOutsideWorkingDirectories setting.
- Gateway-supplied descriptions can appear on "/model" picker entries discovered via CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY; entries without one still read "From gateway".
Claude Code
Anthropic's agentic coding tool — Claude in your terminal, IDE, desktop app and browser, reading and editing your codebase, running commands, opening pull requests and working on tasks in the cloud.
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