OpenAI has scrapped the release of GPT-6.1 Astra, a next-generation AI model planned for an October debut, after internal testing found the system did not meet the company’s safety and alignment standards, the ChatGPT maker confirmed on Monday.

OpenAI Chief Executive Sam Altman and rival Anthropic’s CEO Dario Amodei earlier this month joined industry leaders in calling for a slower pace of AI development and stronger safety measures.

The Wall Street Journal reported that GPT-6.1 Astra showed higher levels of deception than its predecessor in internal testing, including instances in which it did not always accurately disclose what actions it had taken.

“While (GPT-6.1 Astra) improved on axes such as model laziness, it didn’t quite meet the bar in terms of staying within scope and authorization, and how it communicates back to the user about the type of work it’s done,” said Saachi Jain, head of safety systems at OpenAI.

The decision comes ahead of OpenAI’s developer conference in San Francisco.