Developer flags Opus 5 output regression, says AI progress stalled in 2026
julianharris · x · 2026-09-13
Developer Julian Harris compares AI progress from Jan 2025 to Jan 2026 and finds the earlier period striking — but this year feels different. He cites Claude Opus 5 producing dubious diagram-like output ("sort of a schema, but not; sort of an illustration, but not") as evidence that frontier model progress may be stalling.
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