No sign yet that Meta's Watermelon model has surfaced by deadline

The most concrete fact here is that Meta's own research pages show a steady drumbeat of Muse Spark releases, with version 1.3 arriving on September 2, 2026, complete with same-day availability in Muse Code and the Meta Model API. That cadence is real and documented, but nowhere in the official record does the name Watermelon appear, nor does any model get identified by Meta or by credible reporting as that codename. That absence matters. The question requires not just a release, but confirmation that the released model is the one referenced as Watermelon, plus genuine public access rather than a closed preview or a label on a website. Muse Spark 1.1, 1.2 and 1.3, along with Muse Glimmer and Muse Voice Transcribe, all show Meta's pattern of announcing and shipping on the same day. That habit is exactly why a small chance of a late surprise remains plausible. Still, with roughly two weeks left in the window at the time of the most recent evidence, two separate things would need to happen in quick succession: public identification of Watermelon, and a qualifying access channel opening up. Neither has occurred yet. Given Meta has not even named the model in public materials, the more likely outcome is that the window closes without it. The single thing to watch is whether Meta's research blog or app store listings suddenly attach the Watermelon name to any upcoming model, however briefly, in the campaign's final days.