Meta on Wednesday debuted Muse Spark, a homegrown AI model it says significantly narrows the performance gap with models from OpenAI, Anthropic and others.Why it matters: The model — code-named Avocado and built over the past nine months by a team led by Alexandr Wang — is a major upgrade over its Llama 4 models, Meta tells.Driving the news: Muse Spark will power queries in the Meta AI app and Meta.ai website immediately, with plans to expand across Facebook, Instagram and WhatsApp.The model acc...