APEX FLASH-1

Summary from the TLDR InfoSec newsletter

Apex Flash-1 is an open-weights security research model from Cantina and Yeta Labs, a GLM-5.3-Flash fine-tune trained with GRPO reinforcement learning on 150 tasks built from 50 real vulnerability cases. It solved 40 of 60 tasks on Cantina's internal held-out eval versus 36 for the base model and 43 for Claude Opus 5 High, at an estimated $2.38 per run against $74.68, though each model ran the set only once. It is built as a worker model orchestrated by a larger one, and ships with an abliterated variant for teams running self-hosted security agents.