Meta's unreleased frontier large language model, internally codenamed Watermelon and developed by its Superintelligence Labs, is the focus of trader attention due to August reporting citing internal documents that set an October 2026 public release target. Chief AI officer Alexandr Wang stated in a July town hall that the model, still in pre-training at the time, had reached parity with OpenAI's GPT-5.5 on unnamed internal benchmarks while using roughly 10 times the compute of the prior Muse Spark release. A mid-July training pause and the absence of any launch at the September Meta Connect event have kept the timeline tight, with heavy infrastructure spending and competitive pressure from OpenAI underscoring the stakes. Key near-term catalysts include potential executive updates, developer conferences, or leaks that could confirm weights, API access, or a firm rollout date.