Tips for Claude Fable 5.1: Low-Effort Mode and Cost Optimization
RLanceMartin · x · 2026-09-02
Tips for optimizing Claude Fable 5.1:
- Low-Effort Mode: Competitive with Opus and Sonnet on cost per task. On CursorBench, it matches high-effort Fable 5 at a third of the cost.
- Caching: Prompt cache reads are now 4x cheaper ($0.25 vs $1.00/MTok). Use Claude Console to monitor hit rates or run /claude-api cost-optimize.
- Simplify Prompts: Remove verification rituals and stale examples. Run /claude-api prompt-audit to inspect for anti-patterns.
Related event: Anthropic Releases Fable 5.1 and Mythos 5.1 with 75% Cheaper Caching(174 posts)→
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