Claude Code 2.1.257 发布：新增 Fable 5.1 模型及多项修复

AI 摘要

Claude Code 发布 2.1.257 版本更新，新增 Claude Fable 5.1 模型作为默认模型，支持 1M 上下文，定价为 $10/$50 每百万 token，缓存读取 $0.25/Mtok。更新还引入了时间格式设置、自动模式下的 Containment Escape 规则，以及多个修复，包括远程控制、MCP 服务器、后台会话等问题。

正文节选

- Added Claude Fable 5.1 (`claude-fable-5-1`), now the default Fable model — 1M context, $10/$50 per Mtok with $0.25/Mtok cache reads - Added "Time format" (`timeFormat`) and `timeZone` settings: 12-hour, 24-hour, 24-hour UTC, or a strftime pattern for the turn-end clock and transcript-view timestamps - Added a Containment Escape rule to auto mode so cloud metadata-credential fetches, egress evasion, and cross-tenant reach are no longer auto-approved unless your environment marks them expected -

发布时间：—

抓取时间：2026-09-07 03:46

来源机构：Anthropic