Old skills may be hurting Claude Opus 5 because they clash with Fable-era prompts
dbreunig · x · 2026-07-29
The post argues that many Opus 5 complaints may come from incompatible skills left over from Fable. The attached guidance says older prompts and skills built for prior models can be too prescriptive for Claude Fable 5, hurting output quality, and recommends refactoring or removing outdated instructions when the default model behavior is better.
Related event: Anthropic releases Claude Opus 5 prompting guide(7 posts)→
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