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Vibe Coding2026-07-18 · source-backed
The writeup covers a 4.0 stable adding database migrations, nested transactions via db.atomic(), and compound foreign keys, with rc2 work costing about $149.25 in Fable usage. The transferable technique isn't "have the model write code." It's running a model as a dedicated reviewer over a finished diff, where it surfaced five release blockers including a serious transaction bug. Upgrade guide and release notes were written by Fable 5, Opus 4.8, and GPT-5.5 in combination. Heterogeneous model routing applied to documentation, not just subtask dispatch. I've started doing the reviewer pass and it catches things I don't, mostly because it doesn't get bored on file 40.
Each link below shares sources, entities, or timing with this story.
Anthropic released Fable / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Fable); both cover Fable, Opus, Simon Willison; reported by the same outlet (simonwillison.net).
Simon Willison uses Claude / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Simon Willison uses Claude); both cover Fable, GPT, Opus; overlapping topics (code, fable).
Simon Willison uses Claude Code / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Simon Willison uses Claude Code); both cover Fable, GPT, Opus; overlapping topics (code, fable, model).
Anthropic released Fable / Shared entities / Same source domain / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Anthropic released Fable); both cover Opus, Simon Willison; reported by the same outlet (simonwillison.net).
Linked by a graph relationship (Anthropic released Fable); both cover Opus, Simon Willison; reported by the same outlet (simonwillison.net).
Anthropic released Fable / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Fable); both cover Fable, Simon Willison; reported by the same outlet (simonwillison.net).
Simon Willison uses Claude Code / Shared entities / Same source domain / Shared topic / Earlier coverage
Linked by a graph relationship (Simon Willison uses Claude Code); both cover GPT, Simon Willison; reported by the same outlet (simonwillison.net).
Anthropic released Fable / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Fable); both cover Fable, GPT, Opus; overlapping topics (model, release).