Z.AI Unmasked as Creator of the Hottest AI Model This Month — But Can a Free Giveaway Justify a $60 Billion Valuation?

Shares of Z.AI (2513.HK) jumped 5.4% to HK$1,116 on August 27 after the Beijing-based company confirmed it built Ox Alpha, the new AI model that swept to the top of online usage charts with high performance at zero cost. The reveal electrified a stock that has already risen roughly 860% since its HK$116.20 IPO in January. With interim results due August 31, investors are betting Z.AI can convert viral buzz into paying customers — a leap the numbers have yet to confirm.

A Stealth Launch That Doubled DeepSeek's Traffic

Still free to use, Ox Alpha surged to the top spot on AI marketplace OpenRouter's leaderboard, more than doubling DeepSeek's usage.

The model is a 320-billion-parameter system that activates only 18 billion parameters per token, accepts text, images, and video, and supports a one-million-token context window — meaning it can read an entire codebase in one pass. Early tests suggest it surpasses top models from OpenAI and Anthropic on coding and software-agent tasks. That kind of developer adoption is real, but it happened at a price of zero.

Open Weights Mean Developer Love — and Pricing Pressure

Z.AI published the model weights on Hugging Face under the permissive MIT license, letting anyone download and run the model independently. A 50% launch discount runs through September 9, with promotional API pricing at $0.075 per million input tokens and $0.25 per million output tokens — rock-bottom rates that undercut most rivals but won't move the revenue needle quickly. Z.AI's 2025 revenue was 724 million yuan (~$107 million), against an adjusted net loss of 3.2 billion yuan, with R&D spending alone exceeding four times revenue.

The Valuation Math Is Daunting

Z.AI's market cap sits near HK$449 billion as of last close. JPMorgan projects over 534% revenue growth in 2026 — but even that forecast, which pencils in 4.6 billion yuan (~$640 million), leaves the stock trading at hundreds of times forward sales. One analysis applied OpenAI's own price-to-sales ratio and arrived at a "reasonable" Z.AI market cap of just $4–8 billion.

Interim Results Will Be the Real Test The August 31 board meeting to approve first-half results will show whether the first-quarter trend of 83% higher API pricing and a fourfold jump in paid token usage accelerated or stalled. The Ox Alpha stunt proved Z.AI can build a model developers want. The unanswered question: can it charge them enough to justify a stock price that already assumes it will.