Livenerf finds no change in Opus 5.5 accuracy in its first 10-day window

Window 1 (days 11 to 20, from October 4) scored 0.592 against a 0.584 launch-week baseline, a difference of +0.007 plus or minus 0.018 over 780 samples, which the pre-registered rule calls no change. Median output rose from 588 to 606 tokens. Day 19 ran on API credits because the Max weekly meter was exhausted.