Claude Code Changelog shipped v2.1.263 focused on CLI bug fixes and reliability improvements meant to reduce crashes and stabilize commands. The release notes highlight CLI-side changes; everyday users can upgrade for a steadier terminal experience.
ELI5, built by Claude Code teammate Thariq and published in anthropics/claude-plugins-community, turns /eli5 <topic> into HTML artifacts with big pictures and short sentences—handy for grasping module behavior, design tradeoffs, and incident root causes. Anthropic uses it internally. Install via marketplace add anthropics/claude-plugins-community, then claude plugin install eli5@claude-community.
Japanese aggregator @Nag09Tak reports Anthropic shipped Claude Code v2.1.261 on 2026-09-05: org-policy diagnostics via /status and claude doctor, bash/task output caps raised to ~128k chars, new /skill-doctor for unused skills, plus Remote Control, session, and VS Code fixes.
Developer Yuki Yoshioka (@yoppy0123) notes that from Claude Code v2.1.260, Fable 5.1 keeps the prompt cache valid when effort is changed mid-conversation, cutting repeated prefill cost from effort switches. The post warns Opus 5 is not listed in the notes and likely lacks the same fix yet, so treat models differently after upgrading.
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