◉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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⬡ API & SDK/2026-05-29Advanced

Splitting Claude API prompt cache into 5m and 1h tiers — separate TTLs cut cost and stabilize ops

Anthropic's cache_control supports two TTLs: 5 minutes and 1 hour. Splitting them into a two-tier layout — 1h for static system/tools, 5m for variable few-shot — meaningfully changed both my costs and my on-call life. Here's the design with the numbers I observed.

⬡ API & SDK/2026-04-28Intermediate

Diagnosing Claude API Prompt Cache Misses — How to Read the usage Field

If your Claude API prompt cache isn't reducing your bill, the usage field is where to start. This guide walks through the five most common reasons cache_read_input_tokens stays at zero and how to fix each one.

⬡ API & SDK/2026-03-26Advanced

Claude API Cost Optimization Production Guide — Combining Batch API, Prompt Caching, and Adaptive Thinking for Up to 90% Savings

Learn practical implementation patterns to cut Claude API costs by up to 90%. Covers Batch API, Prompt Caching, and Adaptive Thinking strategies, plus production monitoring and budget management.