> Like Claude Mythos Preview, GLM-5.3 has strong capabilities for autonomously building end-to-end cyber exploits. But GLM-5.3 is unlike other frontier models in that it has been released without meaningful safeguards to limit misuse. We find that attackers can bypass GLM-5.3’s safeguards between 64% and 100% of the time with simple techniques in our simulated tests.
> We find that GLM-5.3 develops end-to-end exploits in 50 of 410 attempts. Claude Mythos Preview did so at a similar rate—in 56 of 410 attempts.
I may end up going that direction. I would ideally like to find something that is purpose built to do code pen-testing so I do not have to bypass anything. There are forks of other models built for this, maybe there is a fork of GLM too.
Grok is telling me it can do code security reviews but I am not sure I believe it.
I've been using GLM 5.3 and 5.3 Flash to reverse-engineer some old firmwares, and it hasn't protested at all. Full 5.3 has a scary-good grasp of debugging assembly, QEMU and hex dumps in my experience, it would make for a good "sleuth" model to find potential vulns. 5.3 Flash is closer to 5.5 Sonnet/6 Luna capabilities-wise, but still smart enough to implement the easy fixes or steer your red team agent.
It's been about a year since I switched from Claude Code to Z.AI, so I don't know what I'm missing out on. But I also don't really feel any FOMO, I'd rather support open model releases than amortize another gated-release model like Mythos.
Yeah Opus 5.5 is great but for code review and security checks I think Astra-6 is really great like it'd go so deep and find bugs so small everybody missed that too with using external skills for review.
It found out over 60 bugs and also very token efficient and after that I've done all reviews with Astra only and I'm happy with results :)
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bigyabai 26h ago on HN
> Like Claude Mythos Preview, GLM-5.3 has strong capabilities for autonomously building end-to-end cyber exploits. But GLM-5.3 is unlike other frontier models in that it has been released without meaningful safeguards to limit misuse. We find that attackers can bypass GLM-5.3’s safeguards between 64% and 100% of the time with simple techniques in our simulated tests.
> We find that GLM-5.3 develops end-to-end exploits in 50 of 410 attempts. Claude Mythos Preview did so at a similar rate—in 56 of 410 attempts.
Bender (author) 25h ago on HN
Grok is telling me it can do code security reviews but I am not sure I believe it.
bigyabai 21h ago on HN
It's been about a year since I switched from Claude Code to Z.AI, so I don't know what I'm missing out on. But I also don't really feel any FOMO, I'd rather support open model releases than amortize another gated-release model like Mythos.