How to bring Opus closer to Fable 5 performance using local logs
Anthropic has removed Fable 5, but every Claude Code session is saved locally in a JSONL file. These files contain prompts, responses, and tool calls, with every turn tagged by the model. Your previous Fable 5 sessions are already on your machine.
The process is straightforward. Ask Claude Code to write a Python script to clean the files of noise and filter the claude-fable-5 turns into a single corpus. From there, perform a behavioral analysis: count steps per task, frequency of file reading before edits, and planning frequency before actions.
Distill the results into a playbook file and inject it via a start hook or the CLAUDE.md file. If you lack your own sessions, the community has uploaded datasets to HuggingFace: Glint-Research/Fable-5-traces, which is 69.8 MB.
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