Presidents Trump and Xi discussed trade and artificial intelligence in a high-profile Washington summit, but the sensitive issue of Taiwan was reportedly confined to private talks.
The Chinese leader's visit includes high-level talks and a state dinner with President Trump.
Treasury Secretary Bessent said the deal, due to expire in November, now runs to January 10, with more expected from Beijing.
Presidents Trump and Xi are expected to agree to only limited cooperation on AI safety as warnings about the technology's risks grow louder.
Fentanyl precursors, rare earth supplies, tariffs, AI chip access and arms sales to Taiwan are among the topics expected to feature, according to TASS.
A report from Deutsche Welle — English sets out the main available details, with claims kept attributed to their sources.
Washington and Beijing are reportedly weighing a direct communication channel on artificial intelligence as competition and restrictions intensify.
RFI reports the US Treasury secretary met his Chinese counterpart in New York ahead of a planned Trump-Xi summit on trade.
Insider warnings, hacking scares during testing and a US-China race have split opinion in the industry and in Washington, France 24 reported.
France 24 reported that officials from both countries held talks in New York on Sunday aimed at progress on technology and trade before this week's summit.
France 24 reported that officials from both countries discussed a mechanism to communicate about serious AI incidents during New York talks on Sunday.
Discussions focused on AI security, rare earths and agricultural purchases, Anadolu Agency reported.
The Treasury secretary's comments come ahead of the Sept. 24 meeting between Presidents Trump and Xi, CNBC reported.