ANTHROPIC : According to the latest report from METR, Anthropic is accelerating its internal AI model development, and this is attributable to Anthropic’s extensive use of AI for R&D

> Anthropic have accelerated 1.9x since October 2025. 

> The chart categorizes Opus 5.5 as "non-frontier" and highlights internal models named Model 3 and Model 4, with substantial improvement achieved in a very short period.  

RSI bench?