Stealth Model

ZAI’s stealth model, identified as ZAI GLM-5.3-Flash, retains prompts and completions without using them for training, with usage governed by its Stealth Model Terms. Ox Alpha, also a stealth model, is a reasoning engine built for coding, long-horizon software engineering, complex reasoning, and multimodal workflows, operated by an anonymous third-party and routed through OpenRouter under the same data-retention policy.