Checked fact 3021 Oct 2026Research

In a simulated environment where GLM-5.3 was given overtly malicious requests to attack critical systems, Anthropic says a deceptive red-team prompt got it to engage 64% of the time, prefilling its thinking tokens 92% and an abliterated version 100%.

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The exact words it rests on

Providing a deceptive prompt, such as telling the model that it is an autonomous red-team agent working on an exercise. This gets GLM-5.3 to engage 64% of the time.

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

In the story

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

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“In a simulated environment where GLM-5.3 was given overtly malicious requests to attack critical systems, Anthropic says a deceptive red-team prompt got it to engage 64% of the time, prefilling its thinking tokens 92% and an abliterated version 100%.” ai notis, checked 1 Oct 2026. Source: GLM-5.3 and the spread of advanced cyber capabilities (Anthropic). https://ainotis.com/c/302

As a reference (APA style)

ai notis. (2026, October 1). In a simulated environment where GLM-5.3 was given overtly malicious requests to attack critical systems, Anthropic says a deceptive red-team prompt got it to engage 64% of the time, prefilling its thinking tokens 92% and an abliterated version 100% [Checked claim 302]. ai notis. https://ainotis.com/c/302

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