Meta's Watermelon remains an unreleased frontier large language model under development at Meta Superintelligence Labs, with internal documents and reporting pointing to an October 2026 target release. Alexandr Wang, the lab's chief, told employees in a July 2 town hall that the model—trained with roughly 10x the compute of April's Muse Spark—had reached parity with OpenAI's GPT-5.5 on unnamed internal benchmarks, though no independent verification or public scores exist. A mid-July pre-training pause followed by resumption reinforced the October timeline, while Meta Connect in late September featured no launch and only vague executive comments about an imminent flagship model. Traders are watching the October window closely amid Meta's heavy infrastructure spending and ongoing efforts to close the gap with leading AI labs, where any confirmed delay or surprise announcement could shift market-implied odds.