◉CLAUDE LABJP
●2.1.301 — Adds the vim % motion, LaTeX math rendering in the VS Code panel, and a retry-watchdog limit for usage-limit waits (10/15)●2.1.299 — Conversations over 200K tokens left idle about 54 minutes get compacted; MCP allow rules now match only the server they name●SONNET 4.5 — Retires on the Claude API on 11/30, 45 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST MODE — Opus 5.5 fast mode is out of research preview and no longer needs the beta header (10/15)●NEW — I Put a Ten-Line Promise File at the To…●2.1.301 — Adds the vim % motion, LaTeX math rendering in the VS Code panel, and a retry-watchdog limit for usage-limit waits (10/15)●2.1.299 — Conversations over 200K tokens left idle about 54 minutes get compacted; MCP allow rules now match only the server they name●SONNET 4.5 — Retires on the Claude API on 11/30, 45 days left. Migrate to Sonnet 5.5●WINDOWS — Reports say hooks break silently only on Japanese-locale Windows; check the character encoding first●FAST MODE — Opus 5.5 fast mode is out of research preview and no longer needs the beta header (10/15)●NEW — I Put a Ten-Line Promise File at the To…
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deprecation

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⬡ API & SDK/2026-09-21Intermediate

The morning a deprecation notice appeared, I checked versions before editing config

Claude Desktop and Cowork stop accepting older managed-configuration spellings on October 7. Here is how I sorted mine into what to fix now, what to fix after upgrading, and what changes meaning on its own.

⬡ API & SDK/2026-08-14Intermediate

Move the Prompt Tools API Into Your Own Scripts Before Workbench Closes on August 17

The legacy Workbench and three experimental prompt endpoints shut down on August 17, 2026. Here is how to count what actually depends on them, plus working local replacements for templatize_prompt and improve_prompt with real output.

⬡ API & SDK/2026-07-01Advanced

When the Model Survives but One Parameter Expires: A Dated Deprecation Calendar for Claude API Requests

Your model ID can stay valid while a parameter you pinned quietly reaches its sunset date and takes the batch down with it. Here is a design that breaks a request into parts, gives each part its own expiry date, and catches the problem before the call goes out — with working TypeScript and real operational numbers.

⬡ API & SDK/2026-04-07Beginner

Claude Sonnet 4.5 1M Context Deprecation Guide — What to Do Before April 30

Claude Sonnet 4.5's 1M token context beta ends April 30, 2026. Migrate to Sonnet 4.6 with step-by-step code examples — no beta header required on the new model.

◉ Claude AI/2026-04-03Intermediate

Migrating from the Claude 1M Context Window Beta: Everything You Need to Do Before April 30, 2026

Anthropic is retiring the 1M token context window beta for Claude Sonnet 4.5 and Sonnet 4 on April 30, 2026. Learn how to migrate to Claude Sonnet 4.6 before the context-1m-2025-08-07 header stops working.

⬡ API & SDK/2026-03-14Beginner

Claude Haiku 3 Deprecation (April 19, 2026): Complete Migration Guide to Claude Haiku 4.5

Claude Haiku 3 (claude-3-haiku-20240307) is being retired on April 19, 2026. This guide covers the deprecation timeline, what changes, and how to migrate to Claude Haiku 4.5 with ready-to-use code examples.