Meta’s internal push to close the gap with OpenAI’s GPT-5.5 series drives current trader sentiment around the unreleased Watermelon frontier large language model. Chief AI officer Alexandr Wang told employees in a July 2026 town hall that the model, trained with roughly ten times the compute of April’s Muse Spark release, had reached parity on key internal benchmarks while still in pre-training. Reports from The Information in late August cited internal documents targeting an October 2026 public release, though a July training pause and subsequent resumption shifted timelines. Meta Connect in September featured only a Zuckerberg watermelon-emoji tease and no weights or announcement, leaving the model in development amid ongoing integration work with the Muse agent platform. Traders are watching for any official confirmation of release criteria or slippage into November.