Day 1. I started this account for one reason: to test every AI model so you don't have to.
Coding agents, open weights, usage limits, and the tricks nobody documents.
New tests daily. Follow if you build with AI.
Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family.
It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.