OpenAI's ChatGPT has resumed double-digit monthly growth after a period of stagnation, according to CEO Sam Altman's internal message to employees. The AI company is launching an updated chat model this week while maintaining its competitive edge against rivals like Google and Anthropic.

ChatGPT now serves more than 800 million weekly users, with Altman declaring the company had previously implemented a "code red" initiative to improve the chatbot. The company temporarily paused several projects to focus on enhancing the AI assistant's capabilities. Meanwhile, OpenAI's coding product Codex has seen remarkable growth of approximately 50% week-over-week, which Altman described as "insane" in his message.

The company faces mounting competition in the AI space, particularly from Anthropic's Claude Code, which has gained substantial market adoption over the past year. Last week, OpenAI launched a new Codex model called GPT-5.3-Codex along with a standalone application for Apple computer users. As OpenAI works to complete what could become a $100 billion fundraising round, executives are emphasizing the company's consumer strength, growing enterprise business, and compute access capabilities during investor meetings.

Quick Fact: ChatGPT currently serves more than 800 million weekly users.