●DESIGN — Claude Design gets a major update: design-system imports, direct canvas editing, and more export formats●CODE — Claude Design can start from your local codebase and hand a design off to Claude Code to implement●FABLE — Fable 5, a Mythos-class model made safe for general use, is now available in Claude Code v2.1.170●FIX — Mid-stream connection drops now preserve partial responses instead of showing a raw error●SCROLL — A new wheelScrollAccelerationEnabled setting disables mouse-wheel scroll acceleration in fullscreen●TIER — The Claude Design beta is available to Pro, Max, Team, and Enterprise customers●DESIGN — Claude Design gets a major update: design-system imports, direct canvas editing, and more export formats●CODE — Claude Design can start from your local codebase and hand a design off to Claude Code to implement●FABLE — Fable 5, a Mythos-class model made safe for general use, is now available in Claude Code v2.1.170●FIX — Mid-stream connection drops now preserve partial responses instead of showing a raw error●SCROLL — A new wheelScrollAccelerationEnabled setting disables mouse-wheel scroll acceleration in fullscreen●TIER — The Claude Design beta is available to Pro, Max, Team, and Enterprise customers

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cache-invalidation

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claude-api¹ caching¹ redis¹ semantic-cache¹ production¹ observability¹

⬡ API & SDK/2026-06-18Advanced

When Your Claude API Response Cache Returns Stale Answers and Near-Miss Wrong Ones — Field Notes on Freshness and False-Hit Suppression

A Claude API response cache improves latency and cost immediately, but the problems that hurt in production are not average hit rate — they are stale hits and semantic false hits. Here is the key design, freshness management, false-hit suppression, and observability that keep a cache honest.