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Switching Effort Nuked My Prompt Cache. The Next Day It Didn't.

karanbansal.in · published 4 September 2026

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https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1
platform.claude.com
https://www.anthropic.com/claude-fable-and-mythos-5-1
anthropic.com
https://github.com/anthropics/claude-code/releases/tag/v2.1.260
github.com
Prompt Caching Doesn't Cache Prompts Read at the source ↗
karanbansal.in
https://platform.claude.com/docs/en/build-with-claude/prompt-caching
platform.claude.com
https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages
platform.claude.com
https://platform.claude.com/docs/en/build-with-claude/effort
platform.claude.com
https://platform.claude.com/docs/en/release-notes/overview
platform.claude.com
https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md
github.com