GLM-5.3-Flash

Z.ai's first natively multimodal model in the GLM-5 family, designed for efficient coding, agentic work, visual reasoning, and long-context tasks. It uses a 320B-parameter sparse mixture-of-experts architecture with 18B active parameters, hybrid linear and sparse attention, and a context window of up to one million tokens. The model weights are released under the MIT license for local deployment with frameworks including SGLang and vLLM.