NEW YORK (Reuters) - Chinese state-linked social media accounts amplified narratives celebrating the launch of Chinese startup DeepSeek's AI models last week, days before the news tanked U.S. tech stocks, according to online analysis firm Graphika.

The accounts involved in the effort, including those of Chinese diplomats, embassies and state media, amplified media coverage of the launch and promoted the idea that DeepSeek challenged U.S. dominance in the AI sector, New York-based Graphika said in a report it provided to Reuters on Thursday.

The messaging was rolled out on platforms such as Elon Musk's X and Meta Platforms' ( META ) Facebook and Instagram, as well as Chinese services Toutiao and Weibo ( WB ), Graphika said.

"This activity shows how China is able to quickly mobilize a range of actors that seed and amplify online narratives casting Beijing as surpassing the U.S. in critical areas of geopolitical competition, including the race to develop and deploy the most advanced AI technologies," Graphika Chief Intelligence Officer Jack Stubbs told Reuters.

"We've consistently seen overt and covert Chinese state-linked actors among the first movers in leveraging AI to scale their operations in the information environment."

Graphika said it also found a video featuring pro-China, anti-Western content on a YouTube channel whose activity resembled that of Shadow Play, a coordinated influence campaign involving at least 30 YouTube channels that was first identified by the Australian Strategic Policy Institute in 2023.

YouTube owner Alphabet, Meta, X and the Chinese embassy in Washington, D.C. did not immediately respond to requests for comment on the report.

Graphika said it found a small spike in discussion about DeepSeek's advancements in relation to OpenAI's ChatGPT on X immediately after DeepSeek released its models on Jan. 20, followed by a much larger uptick that started on Friday and continued to build over the weekend.

By Monday, DeepSeek's free AI assistant had overtaken U.S. rival ChatGPT in downloads from Apple's app store and global investors dumped U.S. tech stocks, wiping $593 billion off chipmaker Nvidia's ( NVDA ) market value in a record one-day loss for any company on Wall Street.

Nvidia ( NVDA ) declined to comment on the Graphika report.

DeepSeek's researchers claim to have developed aspects of their AI model at a far lower cost than U.S. rivals, sparking worries that U.S. companies that have plowed tens of billions of dollars into AI data centers could face a price war with China.

Shares of Microsoft ( MSFT ), a major investor in OpenAI that operates data centers on behalf of the ChatGPT creator, slid earlier this week when it disclosed slower cloud revenue growth than Wall Street expected while it continued to plow billions into capital expenditures.

Microsoft ( MSFT ) and Meta have vowed to continue deep investments in AI for the foreseeable future.

DeepSeek's rise to prominence was celebrated in China as a sign that the nation was beating back Washington's attempts to contain China's tech industry with curbs on technology exports.

In the U.S., DeepSeek's accomplishments sparked accusations that it had improperly accessed technology from OpenAI and other leaders, though the allegations remain unproved.

The U.S. Commerce Department is looking into whether DeepSeek has been using U.S. chips that are not allowed to be shipped to China, a person familiar with the matter said.