Claude Opus 4.8 and Sonnet 5 seem worse at tool calls than older models, likely due to post-training that assumes Claude Code-like harnesses as targets (Armin Ronacher/Armin Ronacher's Thoughts and Writings)

Armin Ronacher / Armin Ronacher's Thoughts and Writings:
Claude Opus 4.8 and Sonnet 5 seem worse at tool calls than older models, likely due to post-training that assumes Claude Code-like harnesses as targets  —  A very strange Pi issue sent me down a rabbit hole over the last two days.  The short version is that newer Claude models sometimes call Pi's edit tool …

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