The provided article content is paywalled and contains no substantive details about Biren Technology's funding round beyond the headline "Chinese AI Chip Firm Biren Plans $1 Billion Fundraising." As a result, the accessible text does not disclose the milestone of the round, key investors, planned use of funds/expansion plans, or notable metrics such as clients, revenue, pipeline, or employee count. A factual, data-rich summary cannot be generated from this source alone without hallucinating details not present in the excerpt.