Claude Code 2.1.260 fixes Fable 5.1 cache and effort mid-session; npm latest is 2.1.260.
v2.1.260: fullscreen /diff panel beside the chat; /cost and status prompt_cache name why a cache missed; /effort on Fable 5.1 no longer busts the prompt cache mid-session; Fable tool-result context is cached again (it was re-sent uncached every tool turn); model: fable agents honour [1m] on ANTHROPIC_DEFAULT_FABLE_MODEL; /model shows Fable 5.1 for orgs that have it. The 2.1.259 Bash Read() deny expansion is reverted — it blocked npm run build under Read(.//build/).12
npm dist-tags: latest/next 2.1.260, stable still 2.1.236.2 Copilot adds Gemini 3.8 Flash (intro pricing through 31 Dec 2026) and schedules Gemini 3.5/3.6 Flash, Kimi K2.7 Code, and Claude Opus 4.7 off on 2 Oct 2026.34
Pin Claude Code ≥2.1.260 if you run Fable 5.1. On Copilot, enable Gemini 3.8 Flash and plan the 2 Oct model cutover.