Development

Anthropic evaluates GLM-5.3 cyber capabilities

development2026-09-30models

Claim

The newsletter reports Anthropic finding Zhipu's open-weight GLM-5.3 nearly matching Claude Mythos Preview at exploit construction and reporting that safeguards could be removed for $4,400.

Reported metric: $4,400

Reporting date: 2026-09-30 (not necessarily the event date)

Sources

Attribution and reporting linked by this record; links do not imply independent verification.

Welcome to September 30, 2026 (theinnermostloop.substack.com)
Source linked by the September 30 issue (www.anthropic.com)

Indexed from the September 30 newsletter. Linked-source claims have not been independently verified.

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About

Reported in

Welcome to September 30, 2026

Actor

Anthropic

Referenced by

Welcome to September 30, 2026

Cite or correct this record

Citation formatCitation text

Anthropic evaluates GLM-5.3 cyber capabilities
Innermost Loop KB — secondary record
Reporting date: 2026-09-30
KB permalink: https://nicholsn.github.io/innermost-loop-kb/developments/2026-09-30-glm-cyber
Claim: The newsletter reports Anthropic finding Zhipu's open-weight GLM-5.3 nearly matching Claude Mythos Preview at exploit construction and reporting that safeguards could be removed for $4,400.
Attributed sources:
- Welcome to September 30, 2026 — https://theinnermostloop.substack.com/p/welcome-to-september-30-2026
- Source linked by the September 30 issue — https://www.anthropic.com/research/glm-5-3-and-the-spread-of-advanced-cyber-capabilities
This citation does not imply independent verification of linked-source claims.

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