What model was Ox Alpha?

Ox Alpha was revealed to be ZAI GLM-5.3-Flash, which can be used here: https://openrouter.ai/z-ai/glm-5.3-flash

What is the context length of Ox Alpha?

Ox Alpha has a 1,048,576 token context window.

What inputs and outputs does Ox Alpha support?

Ox Alpha accepts text, images, and video as input and returns text.

When was Ox Alpha released?

Ox Alpha was released on August 20, 2026.

This stealth model was developed and operated by ZAI, revealed to be ZAI GLM-5.3-Flash. Prompts and completions for this model were retained by the provider and are not used for training; all other use is governed by the Stealth Model Terms.

Ox Alpha

stealth/ox-alpha

Ox Alpha is a reasoning model designed for coding, sustained agentic work, and production workloads. It is suited for long-horizon software engineering, complex reasoning, and workflows that combine text with visual context.

Ox Alpha is a stealth model. It is developed and operated by a third-party provider who has chosen to remain anonymous during this preview. OpenRouter routes requests to it and is not its developer, owner, or provider. Prompts and completions are retained by the provider and are not used for training; all other use is governed by the Stealth Model Terms.

Modalities

Context

1.0M

Released

Aug 20, 2026

Not currently available through EU in-region routing. In-region routing docs

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Ox Alpha

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Ox Alpha

Activity

Frequently asked questions

What model was Ox Alpha?

What is Ox Alpha?

What is the context length of Ox Alpha?

What inputs and outputs does Ox Alpha support?

When was Ox Alpha released?

Explore more models

More models from Stealth

More models from Stealth