OpenAI, the research lab behind the viral ChatGPT chatbot, is in talks to sell existing shares in a tender offer that would value the company at around $29 billion, according to people familiar with the matter, making it one of the most valuable U.S. startups on paper despite generating little revenue.Venture-capital firms Thrive Capital and Founders Fund are in talks to buy shares, the people said.The deal is structured as a tender offer, with the investors buying shares from existing shareholders such as employees, the people said.Sign In- adidas:adidas Promo Code: 30% Off Sneakers + Free Shipping- Nike:60% off running shoes and apparel at Nike without a promo code- American Eagle Outfitters:All Jeans + Pants 25% off!Plus, 60% off clearance with American Eagle promo code- Michael Kors:Sign Up For KORSVIP + Get 10% OFF your first purchase w/ Michael Kors Promo Code- JCPenney:Today's JCPenney coupon code - 30% off entire purchase- Target:Get 20% off with online Target promo code"