Writing about backend systems

Notes from production work: authentication, messaging, migrations and AI-assisted delivery.

12 Nov 2026 Claude Models Explained: Haiku, Sonnet, Opus, and Fable as Tools in a Workshop Super Intelligence Claude has several models, and each one fits a different job. This post uses a workshop analogy: Haiku is a screwdriver, Sonnet is a power drill, Opus is a CNC machine, and Fable is an industrial robot arm. It shows how to pick the right model for each task to save time and cost.