Forensic Summary
The UK AI Security Institute has evaluated GPT-5.5 and found it comparable to Claude Mythos in identifying security vulnerabilities, with both models now generally available to the public. This parity raises serious concerns about the lowered barrier to entry for offensive cyber operations, as adversaries can leverage widely accessible models for vulnerability research. Commentary from security experts highlights that LLM-based vulnerability discovery is constrained to known attack patterns, but the existence of jailbreaks means guardrails provide only partial mitigation.
Read the full technical deep-dive on Grid the Grey: https://gridthegrey.com/posts/gpt-5-5-matches-specialist-models-in-vulnerability-discovery-democratising-cyber/
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