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Summary
This guide documents behavioral differences between Claude Fable 5.1 and Claude Mythos 5.1 and provides prompting patterns to correct each.
It covers effort-level tuning, progress-update visibility, tool-call batching in agent loops, append-only conversation history, writing density, compaction summaries, and safeguard false positives. Each section pairs a specific observed behavior with a concrete prompt line or API configuration fix.