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Checked fact 2981 Oct 2026Research

Anthropic’s Frontier Red Team published GLM-5.3 and the spread of advanced cyber capabilities on 29 September 2026.

The exact words it rests on

GLM-5.3 and the spread of advanced cyber capabilities

What the source said when we opened it, on 1 Oct 2026.

The source

GLM-5.3 and the spread of advanced cyber capabilities
Anthropic · 2026-09-29

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In the story

Anthropic says GLM-5.3 builds exploits close to Claude Mythos Preview 1 Oct 2026

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