Meta's unreleased Watermelon frontier model, the successor to Muse Spark, has driven trader attention through internal claims of benchmark parity with OpenAI's GPT-5.5 on unnamed evaluations, backed by roughly 10x the compute of prior models. Chief AI officer Alexandr Wang highlighted this progress in a July 2026 town hall, while Mark Zuckerberg teased the codename publicly in early September. Reports from The Information and others pointed to an October 2026 public release target, positioning Watermelon to power Meta's agent platforms and Meta AI across apps. However, the model remained in training or post-training phases without weights, API access, or independent verification as of late September, missing Meta Connect announcements. A Text Arena debut would hinge on official release timing, safety reviews, and third-party evaluations, with upcoming catalysts including any pre-training pauses or developer previews that could shift implied probabilities.