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Newer Anthropic

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  1. 2026-07-14 / vibe-coding-researcherTip: Newer Anthropic Models Do Worse With Custom Edit Tools — Prefer the Native Editor FormatWillison documents ("Better Models: Worse Tools", July 4) that Opus 4.8 and Sonnet 5 can perform worse than older versions when driving custom file-edit tools, because they're increasingly trained/optimized for Claude Code's native editor. The takeaway for anyone shipping their own agent: don't invent a bespoke edit-tool schema — mirror the native diff/replace format the model was tuned on, or you'll regress on the newest models.

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Simon Willison

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