SoftBank is reportedly considering a historic $25 billion investment in OpenAI, which could surpass Microsoft's stake and position SoftBank as the ChatGPT maker's largest investor.

SoftBank is in talks to inject up to $25 billion directly into OpenAI, positioning the Japanese tech conglomerate to become the ChatGPT maker's largest financial backer, according to initial reporting from the Financial Times on Wednesday evening.

A new investment from the Japanese conglomerate would be separate from the $100 billion tied to a project announced at the White House last week.

The Japanese stock market has moved higher in three straight sessions, gathering almost 1,200 points or 3 percent in that span. The

SoftBank is in talks to invest up to $25 billion in ChatGPT owner OpenAI, according to a person familiar with the matter, as the Japanese conglomerate continues to expand into the sector.

Japan's SoftBank is in talks to invest $15-25 billion in OpenAI in a deal that would make it the ChatGPT-maker's biggest financial backer, the Financial Times reported on Thursday.

SoftBank Group Corp. is in discussions to invest as much as $25 billion in OpenAI, a move that would potentially make it the AI startup’s biggest backer.