Microsoft has developed a series of large language models (LLM) to rival OpenAI and Anthropic models.The LLM series, known as MAI, is being tested for performance and its potential use in Microsoft's Copilot AI assistants.Microsoft is developing a second LLM series optimized for reasoning tasks while the current MAI series is focused on general-purpose processing.The development of MAI models could reduce Microsoft's reliance on OpenAI and expand the support for multiple competing LLMs in Copilot.