The Powerful Stealth AI Model ‘Ox Alpha’ Is Now GLM-5.3-Flash, and You Can Use It

The anonymous Ox Alpha AI model that popped up on OpenRouter, the unified AI platform, last week has been claimed by the Chinese company Z.ai. Now officially known as GLM-5.3-Flash, the model is both powerful and cheap, challenging the capabilities and cost of popular models from Anthropic and OpenAI.

When it was first teased, Ox Alpha became the most popular model for the week on OpenRouter and all of its traffic was served through Chinese-made AI chips. After it was confirmed to be the company behind the new model, Z.ai’s stock price soared, Bloomberg reports.

Ox Alpha was described as a “frontier model built for efficient coding, sustained…

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