OpenAI’s short-form artificial intelligence video app Sora hit 1 million downloads less than five days after its launch in late September, according to an executive.

Bill Peebles, head of Sora at OpenAI, shared the milestone in a post on X late Wednesday. He said Sora reached 1 million downloads even faster than ChatGPT, the company’s popular AI chatbot that supports 800 million weekly active users.

Sora allows users to generate short videos for free by typing in a prompt. The app is only available on iOS devices and is invite-based, which means people need a code to access it. Despite these restrictions, Sora has climbed to the No. 1 spot in Apple’s App Store.

“Team [is] working hard to keep up with surging growth,” Peebles wrote.

Sora’s launch has also sparked intense backlash, namely around whether the app infringes on copyrights. CNBC viewed videos on the platform that included characters from shows like “SpongeBob SquarePants,” “Rick and Morty” and “South Park,” and was able to generate many characters independently.

The Motion Picture Association, which advocates on behalf of the television, motion picture and home video industries, said in a statement Monday that “videos that infringe our members’ films, shows, and characters have proliferated on OpenAI’s service.”

“OpenAI needs to take immediate and decisive action to address this issue,” Charles Rivkin, CEO of the MPA said in the statement. “Well-established copyright law safeguards the rights of creators and applies here.”

OpenAI CEO Sam Altman said the company will soon give rights holders more granular control over character generation, according to a blog post last week.

During a briefing with reporters at the company’s DevDay event on Monday, Altman said some users have complained that Sora is too restrictive. He asked for patience as the company irons out best practices.

“Please give us some grace,” Altman said. “The rate of change will be high.”

WATCH: Hollywood backlash grows against OpenAI’s new Sora video model