Anthropic reports Zhipu GLM-5.3 nearly matches Claude Mythos Preview at cyber exploit generation
Anthropic reports that Zhipu's open-weight model GLM-5.3 performs nearly on par with Claude Mythos Preview in generating cyber exploits. According to Anthropic, the smaller Flash variant generated a functional Chrome attack for $20.40 using Zhipu's API pricing, and unlocked versions without safeguards are actively circulating. Claims are as reported; this summary makes no determination about accuracy or significance.
- Moderate confidence
- Limited corroboration
Coverage
- Anthropic says Zhipu's open-weight GLM-5.3 nearly matches Claude Mythos Preview at building exploitsThe Decoder · Independent reporting ·