Ox Alpha is GLM-5.3 Flash

Large language models (LLMs) are advanced AI systems trained on massive text datasets to understand, generate, and reason about human language, powering applications such as chatbots, code generation, summarization, and scientific discovery.

Systems trained on data to learn patterns and make predictions or generate outputs, such as text, images, or decisions, by approximating relationships between inputs and outputs without being explicitly programmed for each task.

AI models whose trained weights are published for anyone to download, run, and modify.

An anonymous frontier model released on OpenRouter in August 2026 with a one-million-token context window.

Models that process and generate language. Used in communication and content tasks.

Z.ai's 320B-A18B open-weight model, released under the MIT License and previewed anonymously as Ox Alpha.