ResearchSeptember 29, 2026
27
🌶️
Opus 5.5 Under Constant Watch
The Livenerf benchmark tracks whether Anthropic's Opus 5.5 quietly degrades after launch.
#Anthropic#Benchmark#Model Drift#Evaluation#Opus
🔥 What happened
A new open-source benchmark called livenerf launched to track whether Claude Opus 5.5 quietly degrades after release. It runs daily for 30 days with frozen prompts and a pinned CLI to statistically measure drift.
💡 Why it matters
First clean day-0 baseline against Anthropic's notorious "nerfing" rumors. The tool detects a 7.5-point accuracy drop per 10-day window for just 3.6% of the weekly plan. Output tokens reveal effort reductions far earlier than accuracy does.
⚡ Our take
Finally, someone replacing vibes-based arguments with hard data. If Anthropic really degrades models post-launch, this repo will prove it—or bury the conspiracy theory for good.
The title, summary and analysis of this item were produced automatically by an AI system and have not been editorially reviewed. They may contain errors, bias or omissions — when in doubt, read the linked original source.
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