◉CLAUDE LABJP
●2.1.296 — Sonnet 5.5 cache reads drop to $0.10/Mtok (was $0.20), and the MCP description limit rises to 4,096 characters●2.1.295 — Hooks gain onFailure: "block", so a failed or timed-out hook no longer lets the action through●SONNET 4.5 — Retires on the Claude API on 11/30, 51 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: the console jumps back to the top of history whenever output is appended●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — When first requests keep missing, hand over a one-page description of your work first●2.1.296 — Sonnet 5.5 cache reads drop to $0.10/Mtok (was $0.20), and the MCP description limit rises to 4,096 characters●2.1.295 — Hooks gain onFailure: "block", so a failed or timed-out hook no longer lets the action through●SONNET 4.5 — Retires on the Claude API on 11/30, 51 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: the console jumps back to the top of history whenever output is appended●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — When first requests keep missing, hand over a one-page description of your work first
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⬡ 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.

◉ Claude AI/2026-03-26Intermediate

Claude Opus 4.6 Complete Feature Guide: 1M Context, Adaptive Thinking & Agent Teams

Claude Opus 4.6 and Sonnet 4.6 released March 25, 2026. Explore 1M context at standard pricing, 128k output, Adaptive Thinking, Dynamic Filtering, Compaction, and Fast Mode with code examples.