Expired50% confidenceFactExact time
Claude's flagship models Opus 4.8 and Sonnet 5, when calling Pi's editing tool, fabricate extra fields out of thin air in the nested edits[] array, causing the parameter structure to be non-compliant with the schema.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/7/2026
First Seen
Valid until: 10/5/2026(expired)
Sources
Related Claims
UnverifiedThe latest and most powerful Claude models (Opus 4.8 and Sonnet 5) actually perform worse than older models when calling Pi's custom editing tool.82% similarUnverifiedClaude Code may default to calling a Sonnet-level model rather than Opus 473% similarUnverifiedThe key turning point for Claude Code's performance improvement was the evolution of underlying models: Sonnet 4, Opus 4, and Opus 4.570% similarUnverifiedOpus 4.5 performed excellently in the iteration phase, inheriting the essence of the original design and making meaningful changes at the detail level.66% similar
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