Claude Opus 5.5 just took a big drop on NerfBench.
Yesterday it was scoring above launch. Today it's at 94.2%.
GPT 6 Astra: 98.0%
Sonnet 5.5: 100.9%
GPT 6.1 Sol: 106.7%
94.2% is still inside normal variance, so we can't call it a nerf yet.
But we're watching Opus 5.5 very closely.