LiveNerf tracks Opus 5.5 for 3 weeks, finds no evidence of post-launch nerf

TheOnlyVibemaster · reddit · 2026-10-15

A Reddit-run project called LiveNerf has measured Claude Opus 5.5 daily for 21 days using a frozen 78-question panel (1,638 samples) to test claims that Anthropic quietly degrades its models after launch.

• The first 10 days set a baseline mean of 58.4% with high variance.
• The following 11 days show shrinking variance and regression to the mean; the latest score is 62.8% — no capability drop in the data so far.
• The author cautions this doesn't rule out time-of-day throttling or other adjustment methods.
• The GitHub repo passed 1.5k stars in three weeks; a final verdict is promised in 10 days.

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