GLM 5.3 doesn't seem to refuse vuln research (which it classifies as "audit") and is good at it.

Therefore you use for offensive cybersecurity tasks because Daybreak Red/Mythos is pure unobtainium for us mere plebians.

DB Blue thankfully exists, but I suspect you risk a ban if you use it with codebases you neither own nor use

Tl;dr because it's the only model at the level of 5.4~5.6 that doesn't refuse tasks nor risk your oai account getting banned

For plain RE tasks Sol or Astra should work just fine (I think)