Checked fact 3051 Oct 2026Research

Anthropic says NIST’s CAISI published its own assessment of GLM-5.3 on Sept. 17 and found it "the most cyber-capable open-weight model released to date", lagging the US frontier by about four months on an aggregate of its cyber benchmarks.

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The exact words it rests on

CAISI found that GLM-5.3 is “the most cyber-capable open-weight model released to date” and that it lags the US frontier by about four months on an aggregate of CAISI’s cyber benchmarks.

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

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Checked by the notis newsroom on 1 Oct 2026, against the source above.

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

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“Anthropic says NIST’s CAISI published its own assessment of GLM-5.3 on Sept. 17 and found it "the most cyber-capable open-weight model released to date", lagging the US frontier by about four months on an aggregate of its cyber benchmarks.” ai notis, checked 1 Oct 2026. Source: GLM-5.3 and the spread of advanced cyber capabilities (Anthropic). https://ainotis.com/c/305

As a reference (APA style)

ai notis. (2026, October 1). Anthropic says NIST’s CAISI published its own assessment of GLM-5.3 on Sept. 17 and found it "the most cyber-capable open-weight model released to date", lagging the US frontier by about four months on an aggregate of its cyber benchmarks [Checked claim 305]. ai notis. https://ainotis.com/c/305

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