Meta's internal codename for its next frontier large language model after Muse Spark, Watermelon has drawn trader attention due to August 2026 reporting from The Information citing documents that target an October release. Chief AI officer Alexandr Wang told staff in a July town hall that the still-training model reached parity with OpenAI's GPT-5.5 on unnamed benchmarks after an order-of-magnitude increase in compute, though independent verification is absent and pre-training was briefly paused that month before resuming. The model was not unveiled at Meta Connect in late September, keeping focus on whether Meta can meet the internal October window or slip into November amid ongoing scaling and competitive pressure from faster-moving labs.