Users suspect Claude Desktop shipped a silent system prompt upgrade; Opus 5.5 'feels like 5.8'
bcherny · x · 2026-10-15
Developer Chad Moran tweets that the latest Claude Desktop update feels like a "major system prompt/harness upgrade" — Opus 5.5 now feels like Opus 5.8 — and pings Anthropic staff for confirmation. The tweet was amplified by Meta engineer Boris Cherny, sparking community speculation about silent backend changes (unverified).
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