DeltaSignal Research
Apple opened its Private Cloud Compute models to third-party developers in June 2026, at WWDC26, and the OS 27 generation shipped on September 14, 2026. This report is a single sourced account of what that access actually is: the architecture and its five privacy guarantees, who is eligible and what it costs, and the daily quota Apple counts against each user’s iCloud account while publishing no number for it, including the second, undocumented rate limit that quota checks cannot see. It then covers the working surface, the WWDC 2024–2026 sessions that matter and the on-device and cloud models side by side, and the two quality questions every builder on this stack now faces: how multiple machines and multiple deployments combine, and what the published evidence actually supports for raising a small local model’s accuracy with multiple passes and distillation. Every figure is labeled: documented by Apple or a primary paper, or reported by the community.
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