The Bottom Line: The security filter in Claude 3.5 Sonnet blocks legitimate security requests, limiting its usability for CTOs performing security audits and vulnerability assessments.
Researchers show that Anthropic’s Claude 3.5 Sonnet overreacts to cybersecurity queries, blocking or refusing even harmless or necessary requests for security analysis.
Researchers have documented that Anthropic’s Claude 3.5 Sonnet applies its security filter too restrictively. Merely mentioning terms like “Security Audit” or related security contexts causes the model to reject requests or provide evasive standard responses – even when the query is factual and constructive.
For CTOs, this represents a practical limitation: legitimate use cases such as code review in a security context, vulnerability assessment, or preparation for penetration testing are hindered by the filter. The model cannot differentiate whether a request is actually harmful or part of standard security practice.
The problem lies in the binary filter logic: instead of examining what exactly is being asked, the system reacts to trigger words and phrases. This results in false positives that reduce productivity and cause development and security teams to resort to alternative tools – precisely where Claude would otherwise be valuable.
Source: www.heise.de · Published June 11, 2026
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