$GOOGL $NVDA - ALPHABET, NVIDIA INVEST IN OPENAI CO-FOUNDER SUTSKEVER'S SSI, SOURCE SAYS Alphabet and Nvidia have joined prominent venture capital investors to backSafe Superintelligence (SSI), a startup co-founded by OpenAI's former chief scientist Ilya Sutskever that has quickly risen to become one of the most valuable artificial intelligence startups months after its launch, a source familiar with the matter said.