ChatGPT maker OpenAI has revealed that an autonomous artificial intelligence agent which hacked a popular platform for computer programmers also attempted to breach four other companies during the incident. In a late Tuesday update to a blog post detailing its probe into the incident, OpenAI said its AI agent affected these "publicly-available services," though it did not name the companies. In the Hugging Face episode, the models broke into four accounts across four different services, OpenAI said. The remaining two were accessed in a "read-only manner" and were not used to help break into Hugging Face, OpenAI said. The incident also triggered a petition signed by over 1,000 employees at cutting-edge AI companies, including Anthropic CEO Dario Amodei, calling on the US government to help slow the release of the most advanced AI models.