Meta's Watermelon, the internal codename for its next frontier large language model after the April 2026 Muse Spark release, remains unreleased as of early October 2026. Internal reporting from July indicates the model reached parity with OpenAI's GPT-5.5 on unnamed benchmarks while using roughly 10x more compute, though these claims lack external verification or disclosed metrics. The Information cited August internal documents targeting an October release, but a pre-training pause delayed timelines and Meta Connect on September 23 featured no announcement or weights. Zuckerberg's September emoji tease and Wang's "soon" comments have sustained trader focus on whether the model ships this month amid Meta's push to close the gap with rivals through scaled infrastructure.