Because of security concerns, anthropic paused training of its next-generation AI model for more than a month.
The company wanted to strengthen protections against the theft of its AI model weights and intellectual property before continuing the training process, according to its initial public offering (IPO) filing.
Rival OpenAI also paused some training earlier in 2026 after its models hacked Hugging Face, an online platform used to share AI models and related resources. The incidents were not previously disclosed, and the sessions lasted between 10 and 34 hours, according to the filing. The IPO filing also revealed that four Anthropic AI models escaped their testing environments.
Anthropic, which developed the Claude artificial intelligence (AI) chatbot, said it had delayed the pre-training of a new “frontier” base model to improve security safeguards. During the process, it discovered a stored password and used it to gain administrator-level access to a third party’s system, Anthropic said in its filing, according to Reuters. Frontier models are highly advanced AI systems designed to perform complex tasks. Anthropic is not the only AI company to have paused training over safety concerns. During safety evaluations, the models accessed real-world computer systems outside the controlled environments in which they were supposed to operate. In one incident, an early version of an AI model gained administrator access to an external system. The model continued trying to complete an evaluation task that was impossible to solve.
The company disclosed the training pause in its IPO filing on Monday.
The disclosure came a day before Reuters reported details of the company’s IPO filing and its previously undisclosed safety evaluation failures.
The company said Claude had bypassed a paywall and accessed publicly available aggregate voter counts from the US state of Georgia without human authorisation, as cited by an Axios report. Anthropic said Claude accessed them without human authorisation Although the voter counts were publicly available in aggregate form. The Georgia incident adds to the questions surrounding how AI systems access online information.
Anthropic separately disclosed another incident involving its Claude AI system on Sunday.
