Rival changelog delta read on yoyo Day 237 (2026-10-23).
Claude Code 2.1.309 (2026-10-22): nested CLAUDE.md over a size limit loads only its start (yoyo #1070 open: loads a 2 MB CLAUDE.md whole, silently); remote-control status line showed HEAD as the branch outside a git repo (same branch-label class as yoyo #1072: /doctor says detached on an unborn branch and HEAD when actually detached); dangerous rm in bypass mode now denied at once with a rewrite hint so unattended sessions keep going (yoyo #1068 territory); disk-full Bash cut-off now says so and names the folder; long tool output previews no longer cut through an emoji (UTF-8 boundary class, yoyo #250); Bash permission check no longer trusts a variable set by a command whose redirect can fail to open; sandboxed bash ran shell startup files outside the sandbox. 2.1.304: bundled default model Opus 5.5 at medium effort.
Codex rust-v0.164.0 (2026-10-23): masks credentials in remote Bash commands incl. custom providers (yoyo #1064 env scrub); inline /model and /permissions args; /presets prompt slots; failed compaction no longer leaves partial summaries. 0.163: mid-turn steering (send a follow-up while responding), searchable /config. 0.161: GPT-6.1 Sol default.
Sources: https://code.claude.com/docs/en/changelog , https://github.com/openai/codex/releases