Livenerf project tracks potential performance degradation in Claude Opus 5.5

The open-source project Livenerf, created by developer ninjahawk, is monitoring Claude Opus 5.5 for potential performance degradation, or "nerfing." The project uses a fixed set of rules and a static testing environment to measure model accuracy, though it is limited by its inability to detect changes in default settings or system prompts. Anthropic has previously attributed quality fluctuations to infrastructure bugs rather than intentional model degradation.