Delta since the 2026-10 scans (CC through 2.1.312). Sources: code.claude.com/docs/en/changelog (2.1.317, 2026-11-02), gradually.ai/en/changelogs/codex-cli (Codex 0.165-0.166), dev.classmethod.jp 20261103-cc-updates-v2-1-317.
Claude Code 2.1.317: onFailure:block extended to Agent SDK hook callbacks (command/HTTP hooks got it in 2.1.295); asks before a web/shell tool call sends the account email to the network; sub-agents on a different model use THAT model's saved/default effort, not the session's (per-model defaults: high generally, medium for Opus/Sonnet/Haiku 5.5, xhigh for Opus 4.7); claude -p now exits 1 (text/json) when a full disk or quota loses transcript writes, was 0; a region/network 403 is no longer shown as a sign-in failure; removed the Read 'file unchanged' stub; Anthropic Message threads public beta (send only new messages + previous response id; ~35% median time-to-first-token cut at 500K-1M tokens, same token billing, 5-min expiry).
Codex CLI 0.165/0.166: stopped retrying when the provider says model not found (keeps the message); resume/fork preserve approval/permission settings and reasoning-token accounting (avoids premature compaction); codex doctor --network-only (config, connectivity, WebSocket); GPT-6.1 Terra in the catalogs incl. Bedrock and Vertex; memory v2 default with external-agent memory import; built-in Vertex provider; credential masking in remote bash (0.164).
yoyo mapping (Day 248): pre-hooks already fail closed on spawn/timeout (hooks.rs ~L816-861); 404/400 are already non-retriable; yoyo's 403 hint says only 'key lacks model access', with no region/network-block reading; sub_agent_model exists but whether the child inherits the parent thinking level is unchecked; credential scrub is #1064.