Anthropic 被曝静默下调 Claude Code 缓存时间，开发者质疑成本”暗涨”17%

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agent-wars.com (https://agent-wars.com/news/2026-04-12-anthropic-silently-cut-cache-ttl-from-1h-to-5min-on-march-6th)
Anthropic silently cut cache TTL from 1h to 5min on March 6th
Analysis of Claude Code session data shows Anthropic quietly changed the prompt cache TTL default from 1 hour to 5 minutes around March 6-8, 2026. The regression drove a 20-32% increase in cache creation costs. Data confirms 1h TTL worked...