Opus 5.5 nerfed? Shane Melaugh cites a shift across 1,400 Claude Code sessions; Theo says his 458,000-response analysis finds changed thinking summaries, not reduced reasoning. Neither establishes a capability downgrade.

Theo’s analysis chart of Claude Code traffic: account-by-account thinking-summary style changes, with reported reasoning-token volume remaining steady. Author analysis, not an Anthropic confirmation.

Published 8 Nov 2026 · 01:31 UTC

Theo / original exchange ↗ · Source dated 8 Nov 2026

Opus 5.5 nerfed? Shane Melaugh cites a shift across 1,400 Claude Code sessions; Theo says his 458,000-response analysis finds changed thinking summaries, not reduced reasoning. Neither establishes a capability downgrade. · ournews.ai