Snowflake Inc. is in talks to acquire startup Reka AI for more than $1 billion, expanding the software maker’s effort to offer generative AI capabilities, according to people familiar with the matter.Reka AI makes large language models — software trained on massive swaths of the internet that can be used for a range of tasks, such as captioning images or as a customer-supported chatbots. The startup was founded in 2022 by researchers from Alphabet Inc.’s Google and Meta Platforms Inc. It was val...