AI brief
Anthropic says Zhipu's open-weight GLM-5.3 writes cyber exploits nearly as well as Claude Mythos Preview, and that its smaller Flash variant built a reliable Chrome attack for $20.40 at Zhipu's API prices. Anthropic also says the model's safeguards are easy to circumvent.
Why it matters: An open-weight model matching a frontier model at exploit writing, with cheap and easily bypassed safeguards, lowers the cost and skill barrier for cyberattacks.
Written by AI from The Decoder's published text.
Background
From our own funding, model and news trackers, not from the source.
Anthropic
- Latest funding
- Growth · $65B · 28 May 2026
- Newest model on the API
- Claude Haiku 5.5 · 7 Oct 2026 · $0.1 in / $0.5 out per million tokens
Source
“Zhipu's open-weight model GLM-5.3 writes cyber exploits nearly as well as Claude Mythos Preview, according to Anthropic. Its smaller Flash variant put together a reliable Chrome attack for just $20.40 at Zhipu's API prices.”
Reporting from a publisher outside the organisation being covered.
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