Oct 20 (Reuters) - Anthropic’s net loss widened sharply to $80.7 billion in the first half of this year, in large part due ​to a rise in the fair value of bonds convertible into shares of the ‌AI startup, according to a draft prospectus for a planned initial public offering that was reviewed by Reuters.

The San Francisco-based company is expected to go public in November and some investors are now weighing a lower valuation of around $1.5 trillion ​following its latest financial disclosures, Reuters reported last week.

Its first-half loss, widening from a loss of $13 ​billion a year earlier, included a $72 billion accounting charge reflecting an increase in the ⁠estimated value of bonds that could eventually convert into Anthropic shares, rather than cash costs tied to ​its operations, the document said.

The disclosures underscore the hefty costs of the AI race even as investors ​give greater scrutiny to whether the vast sums being poured into chips and data centers will generate sufficient returns.