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Which Claude Model, When
Stop paying your principal engineer to rename files. This card maps each model — Default, Sonnet 5, Opus 5, Fable 5.1, Haiku 4.5 — to its best use, agentic role, and relative speed/compute, then separates model choice from Effort and Thinking so you escalate capability only when the task actually earns it.
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Build 025 — Cheatsheet 02: Models
