TOKYO, May 11 (Reuters) - Big technology firms increased their borrowing to fund artificial intelligence on Monday, with Alphabet unveiling plans to issue its first yen-denominated bonds and Amazon preparing to launch its first Swiss franc-denominated bonds.

Bond sales in foreign debt markets underscore how increased spending on artificial intelligence is driving US technology companies to attract investors from outside the United States in a risky race.

Big technology companies are expected to spend more than $700 billion on artificial intelligence infrastructure this year, a sharp increase from $410 billion in 2025. This has led companies to rely more on debt after using their huge cash flows for years.

Alphabet, Google's parent company, and Amazon did not disclose the size of the releases.

An informed source said Alphabet's total issuance is expected to reach several hundred billion yen, adding that the terms are expected to be determined this month.

The source was not authorized to speak on the matter and requested anonymity. Alphabet did not respond to a Reuters request for comment on the size of the offering.

Alphabet hired Mizuho, Bank of America and Morgan Stanley to work on this deal.

Alphabet raised nearly $17 billion days ago through the sale of bonds worth nine billion euros ($10.6 billion) and 8.5 billion Canadian dollars ($6.2 billion).

An Amazon spokesperson said today that proceeds from the new release will be used for corporate purposes, explaining that these may include business investments and future capital expenditures.

An informed source, who asked not to be identified due to the confidential nature of the matter, said that the e-commerce giant had commissioned banks including BNP Paribas, Deutsche Bank and JPMorgan Chase to issue bonds in six tranches with maturities ranging from three to 25 years.

BNP Paribas did not respond to a Reuters request for comment, while JPMorgan Chase declined to comment.

(US$1 = 1.3689 Canadian dollars)

(US$1 = €0.8508)