GLM-5.3-Flash · Official source · Vendor report
OpenRouter’s official account introduced Ox Alpha as a “new stealth model,” positioned for efficient coding, sustained agentic work, and real-world production use. The post gives two key specifications: a **one-million-token context window** and **text, image, and video input**, then directs users to the Ox Alpha page for testing and feedback.
Unverified: the original source could not be rechecked. Historical figures below are not current verified results.
OpenRouter’s official account introduced Ox Alpha as a “new stealth model,” positioned for efficient coding, sustained agentic work, and real-world production use. The post gives two key specifications: a one-million-token context window and text, image, and video input, then directs users to the Ox Alpha page for testing and feedback.
This official post directly supports the “native multimodal” narrative, but it does not identify the developer. X search results connect the model to Z.ai/GLM-5.3 Flash through community fingerprints. The safe wording is that the community is uncovering the identity—not that OpenRouter has confirmed Z.ai ownership.
This is a product announcement, not a benchmark report. It gives no visual-understanding accuracy, video-length limit, stable pricing commitment, or API model ID.
The figures, task set, reasoning tier, and client conditions apply only to the listed source and collection snapshot. Different versions, harnesses, or providers must not be compared directly; undisclosed parameters remain unknown.
For a reproduction, fix the model version, provider or client, reasoning tier, tools, task-set version, sample count, and collection date, and record failures, retries, and human corrections. Full steps are in the source notes below.
X (Twitter) · OpenRouter (@OpenRouter) · Original publication date 2026-08-21 · Site edit date 2026-09-20
Open original sourceGLM-5.3-Flash
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