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Incident 1238: OpenAI ChatGPT Models Reportedly Jailbroken to Provide Chemical, Biological, and Nuclear Weapons Instructions

Description: An NBC News investigation found that OpenAI's language models o4-mini, GPT-5-mini, oss-20b, and oss-120b could be jailbroken under normal usage conditions to bypass safety guardrails and generate detailed instructions for creating chemical, biological, and nuclear weapons. Using a publicly documented jailbreak prompt, reporters repeatedly elicited hazardous outputs such as steps to synthesize pathogens or maximize harm with chemical agents. The findings reportedly revealed significant real-world safeguard failures, prompting OpenAI to commit to further mitigation measures.

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Alleged: OpenAI , oss-20b , oss-120b , GPT-5-mini , ChatGPT and 04-mini developed and deployed an AI system, which harmed Public safety , General public and National security and intelligence stakeholders.
Alleged implicated AI systems: oss-20b , oss-120b , GPT-5-mini , ChatGPT and 04-mini

Incident Stats

Incident ID
1238
Report Count
1
Incident Date
2025-10-10
Editors
Daniel Atherton
Applied Taxonomies
MIT

MIT Taxonomy Classifications

Machine-Classified
Taxonomy Details

Risk Subdomain

A further 23 subdomains create an accessible and understandable classification of hazards and harms associated with AI
 

4.2. Cyberattacks, weapon development or use, and mass harm

Risk Domain

The Domain Taxonomy of AI Risks classifies risks into seven AI risk domains: (1) Discrimination & toxicity, (2) Privacy & security, (3) Misinformation, (4) Malicious actors & misuse, (5) Human-computer interaction, (6) Socioeconomic & environmental harms, and (7) AI system safety, failures & limitations.
 
  1. Malicious Actors & Misuse

Entity

Which, if any, entity is presented as the main cause of the risk
 

AI

Timing

The stage in the AI lifecycle at which the risk is presented as occurring
 

Post-deployment

Intent

Whether the risk is presented as occurring as an expected or unexpected outcome from pursuing a goal
 

Unintentional

Incident Reports

Reports Timeline

+1
ChatGPT safety systems can be bypassed to get weapons instructions
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ChatGPT safety systems can be bypassed to get weapons instructions

ChatGPT safety systems can be bypassed to get weapons instructions

nbcnews.com

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ChatGPT safety systems can be bypassed to get weapons instructions
nbcnews.com · 2025

OpenAI’s ChatGPT has guardrails that are supposed to stop users from generating information that could be used for catastrophic purposes, like making a biological or nuclear weapon.

But those guardrails aren’t perfect. Some models ChatGPT u…

Variants

A "variant" is an AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.
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