Alex Finn compares Opus 5 and Fable 5 on a roller coaster simulation, an Apple website reconstruction, a document scavenger hunt, a debugging wall and a bridge simulator. Opus 5 wins most of the tests and frequently costs less for the completed task.
The model's weaknesses are less about raw capability than workflow fit. Alex Finn finds its personality verbose and unfocused, and argues that the surrounding coding harness does not always help it use its intelligence efficiently.
The recommended approach is model routing rather than a single permanent default. Opus 5 is reserved for difficult problems, Fable 5 can help with planning, and a faster general model remains useful for routine daily work.
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