Despite Mark Zuckerberg hailing Meta’s Llama AI model as among the best in tech, his company is happy to also use a rival when needed. Meta’s internal coding tool, Metamate, incorporates OpenAI’s GPT-4 model, alongside Meta’s own Llama model, to make the tool more useful for developers and other Meta employee who use it, two people who have used the tool told Fortune. OpenAI’s model has been a part of Metamate since at least early this year. The people, a current and a former Meta employee who r...