Meta’s Watermelon remains an unreleased frontier large language model from its Superintelligence Labs, internally positioned as the successor to the April 2026 Muse Spark release (codenamed Avocado). Alexandr Wang told employees in early July that the still-training model had reached parity with OpenAI’s GPT-5.5 on unnamed internal benchmarks while using roughly 10x the compute; those claims have not been independently verified. Reporting from The Information and others cited an October 2026 public target, but Meta Connect on September 23 featured no launch or weights release, only further Muse Spark updates and the Muse agent rollout. Traders are therefore watching whether the model clears internal testing, safety reviews, and integration in time for any Text Arena-style text evaluation or public debut before the frontier shifts further with models like GPT-5.6.