◉CLAUDE LABJP
●2.1.312 — Fixes Claude overwriting very large CLAUDE.md files and skills going missing after a Bash cd●API — The Messages API maximum request size grew from 32 MB to 128 MB (10/28)●SONNET 4.5 — Retires on the Claude API on 11/30, 29 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST — Opus 4.8 fast mode is deprecated and will be removed on 11/30. Migrate to Opus 5.5●NEW — I Put a Ten-Line Promise File at the To…●2.1.312 — Fixes Claude overwriting very large CLAUDE.md files and skills going missing after a Bash cd●API — The Messages API maximum request size grew from 32 MB to 128 MB (10/28)●SONNET 4.5 — Retires on the Claude API on 11/30, 29 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST — Opus 4.8 fast mode is deprecated and will be removed on 11/30. Migrate to Opus 5.5●NEW — I Put a Ten-Line Promise File at the To…
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Sonnet 4.5

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◉ Claude AI/2026-11-01Beginner

"Not Sooner Than November 24" Is Not a Retirement Date: Matching My Own Model IDs to the Table on a Sunday

How to read Active, Deprecated and Retired in Claude's model retirement table, and why a 'not sooner than' date is only a floor. Includes a 60-line Python script that counts the model IDs in your own files, with the output from my run.

◉ Claude AI/2026-10-27Beginner

A Retirement Notice Landed This Morning: Three Screens to Open Before You Change Anything

An English deprecation email from Anthropic arrives and you don't write code. Here are three things to check first: whether it concerns you, what the date really means, and who to tell what.

⬡ API & SDK/2026-10-18Intermediate

43 Days Until Sonnet 4.5 Retires: I Counted Callers From the Usage CSV, Not From grep

claude-sonnet-4-5 retires on November 30. grep only shows what is written in code. Here is a single script that cross-checks model IDs in your code against the Console's Usage CSV, with the results from running it.