alt Hacker NewsMan this was last year and some Claude subreddit drama that I can’t furnish offf the top of my head but maybe one of the historians remember it.
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I asked a historian:
Two postmortems, neither quite "admitted to nerfing":
Sept 2025, infra bugs: "A small percentage of Claude Sonnet 4 requests experienced degraded output quality" [0], alongside "We never reduce model quality due to demand, time of day, or server load." [1]
April 2026, Claude Code: default reasoning effort was lowered from high to medium, plus a caching bug and a verbosity prompt. Per Anthropic, "The models themselves didn't regress, and the Claude API was not affected." [2]
So users were right that quality dropped, but the confirmed causes were bugs and a product default, not deliberate model degradation.
[0] https://status.claude.com/incidents/72f99lh1cj2c
[1] https://anthropic.com/engineering/a-postmortem-of-three-rece...
[2] https://texxr.com/handle/claudedevs
source: https://claude.ai/share/4435bbcf-d6df-44a0-b1db-f08a11858bc2
Noone can seem to remember anything with certainty when asked to actually substantiate these claims.