What changed since publication
- Ox Alpha launched on OpenRouter on August 20, 2026 as stealth/ox-alpha. OpenRouter's current listing now identifies it as Z.AI GLM-5.3-Flash. Its model page still documents a 1,048,576-token context window and text, image and video input. The earlier anonymous-preview description is no longer current.
- The former zero-price preview claim is historical, not a current offer. OpenRouter's current Stealth FAQ names Space Bunny Alpha—not Ox Alpha—as available at no cost. Check the exact model route and price shown in your account before sending requests; do not assume Nous Portal or another router has the same availability.
Choose and verify a current route
- If you are evaluating the OpenRouter route, confirm that stealth/ox-alpha is selectable for your account and inspect the current price and limits before use. Do not reuse old instructions that described it as a free-tier route or imply another portal still offers the same model.
- Model aliases, access and terms can differ across routers. Record the exact provider, model ID, date checked, billing status and retention terms used by your application.
Identity does not remove the data-handling risk
- OpenRouter's current page attributes Ox Alpha to Z.AI and reveals it as GLM-5.3-Flash. The listing says prompts and completions are retained by the provider and are not used for training; this is not a zero-retention promise. Avoid secrets, personal data and regulated content unless your own review approves the terms.
- The preview-era price and privacy terms may not describe the current GLM-5.3-Flash route. Read the provider and router terms for the exact endpoint you will call, then run a small non-sensitive test and check current limits.
What to do next
- Treat Ox Alpha as a historical preview name when reading older launch coverage. For a new integration, start from the current provider listing, verify the GLM-5.3-Flash model ID, route, billing and retention, and compare it against your existing baseline.
- Run a bounded non-sensitive test of the behaviors your application needs—tool calling, structured output and long context—before any production use. Recheck price and terms before each material change to the integration.
Frequently asked questions
Is Ox Alpha an official release?
OpenRouter's current listing identifies it as Z.AI GLM-5.3-Flash. Older anonymous-preview descriptions are historical.
Is the model really free?
That was a preview-era claim. OpenRouter's current Stealth FAQ lists Space Bunny Alpha as free, not Ox Alpha; verify the exact current route and price before use.
Should I send production or personal data to it?
OpenRouter says prompts and completions are retained by the provider and not used for training. That is not zero retention; avoid sensitive data unless the current terms and your policy permit it.
AI assistance is disclosed; every factual claim was reviewed.
Originally published August 24, 2026 and refreshed October 5, 2026 against OpenRouter's current model listing and Stealth page. The listing now identifies Ox Alpha as Z.AI GLM-5.3-Flash and states that prompts and completions are retained but not used for training. Price and access are route-specific and must be checked at use time.