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The unread manual
Claude has never seen 68% of the Claude Code docs.
We replayed 15 months of the official Claude Code docs, one week at a time (3,604 syncs of a community mirror, July 2025 to October 2026), and compared what each Claude model could have read at its training cutoff with the docs today.
- 68% of what the docs say today was not in them at the end of June 2026, the training cutoff of Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5.
- Claude Haiku 4.5, cutoff February 2025: at least 98.6%.
- Since June, 11 CLI flags, 21 slash commands, 3 hook events and 168 environment variables reached the reference tables.
- Half of all sentences are deleted or reworded within 196 days.
Read it, with interactive charts: https://derob98.github.io/ailmanac/docs/whats-new/unread-manual/
The since-cutoff plugin
A SessionStart hook that tells Claude which flags, commands and hook events were documented after its own training cutoff. POSIX sh, no Node, no network.
claude plugin marketplace add derob98/ailmanac --sparse .claude-plugin plugins
claude plugin install since-cutoff@ailmanacReproduce it
node scripts/research/docs-decay.mjs <clone of web3dev1337/claude-code-docs> rebuilds the numbers in about 15 seconds. Method and limits are on the page.
Full list of changes: CHANGELOG.md