GLM 5.3 Flash

Facts

Released

2026-08-25 the day the repository was first published on Hugging Face Hugging Face, read 2026-09-24

Licence

mit the licence the model card declares Hugging Face, read 2026-09-24

Open weights

Yes the weights are published in this Hugging Face repository Hugging Face, read 2026-09-24

Parameters

321.3 billion counted from the safetensors weight files Hugging Face, read 2026-09-24

Active parameters

25.4 billion estimate estimated from the expert counts and sizes in the configuration model configuration, read 2026-09-24

Knowledge cutoff

Unknown

Context window

• 1,048,576 tokens the maximum position embeddings in the model configuration model configuration, read 2026-09-24
• 1,310,720 tokens the context length OpenRouter lists OpenRouter, read 2026-09-24

Longest output

• 943,718 tokens the largest output OpenRouter's first provider allows OpenRouter, read 2026-09-24

Tool calling

• Yes OpenRouter lists tools among the supported parameters OpenRouter, read 2026-09-24

Structured output

• Yes OpenRouter lists structured outputs among the supported parameters OpenRouter, read 2026-09-24

Reasoning controls

• Yes OpenRouter lists reasoning controls, with the efforts max, high, low OpenRouter, read 2026-09-24

Inputs and outputs

text, image in, text out Hugging Face, read 2026-09-24

Good for

• Vision: Hugging Face files it under image-text-to-text Hugging Face, read 2026-09-24
• Reasoning: OpenRouter lists reasoning controls for it OpenRouter, read 2026-09-24

Prices

Run it on your own hardware

Weights are the sizes of the files a source lists, or an estimate from the parameter count where none does. Memory is an estimate: weights plus KV cache plus 512 MiB and 5 percent of the weights for runtime buffers. Check it against your hardware.

Start it with a local runtime

• Ollama

  ollama run hf.co/unsloth/GLM-5.3-Flash-GGUF:UD-IQ1_S

• LM Studio

  lms get unsloth/GLM-5.3-Flash-GGUF
  lms server start

• llama.cpp server

  llama-server -hf unsloth/GLM-5.3-Flash-GGUF:UD-IQ1_S --jinja

• vLLM

  vllm serve zai-org/GLM-5.3-Flash

• SGLang

  sglang serve --model-path zai-org/GLM-5.3-Flash --port 30000

Use it from your harness

Set up for Baseten with the model zai-org/GLM-5.3-Flash. Each endpoint page has the same setup for its own address.

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "baseten": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Baseten",
      "options": {
        "baseURL": "https://inference.baseten.co/v1",
        "apiKey": "{env:BASETEN_API_KEY}"
      },
      "models": {
        "zai-org/GLM-5.3-Flash": {
          "name": "GLM 5.3 Flash",
          "limit": {
            "context": 1310720,
            "output": 943718
          }
        }
      }
    }
  }
}

{
  "providers": {
    "baseten": {
      "baseUrl": "https://inference.baseten.co/v1",
      "api": "openai-completions",
      "apiKey": "$BASETEN_API_KEY",
      "models": [
        {
          "id": "zai-org/GLM-5.3-Flash"
        }
      ]
    }
  }
}

Other ways to reach it

• Berget.AI, model zai-org/GLM-5.3-Flash
• DeepInfra, model zai-org/GLM-5.3-Flash
• Friendli, model zai-org/GLM-5.3-Flash
• Hugging Face, model zai-org/GLM-5.3-Flash
• Modal, model zai-org/GLM-5.3-Flash
• Nebius Token Factory, model zai-org/GLM-5.3-Flash
• RunInfra, model zai-org/GLM-5.3-Flash
• SiliconFlow, model zai-org/GLM-5.3-Flash
• Together AI, model zai-org/GLM-5.3-Flash
• CoreWeave, model zai-org/GLM-5.3-Flash
• OpenRouter, model z-ai/glm-5.3-flash

Published results

These are results other people published. Baltor did not run them and does not rank models by them.

• Results the maker published on the model card published by zai-org Hugging Face, read 2026-09-24
• Artificial Analysis Intelligence Index: 41.8 published by Artificial Analysis OpenRouter, read 2026-09-24
• Artificial Analysis Coding Index: 71.5 published by Artificial Analysis OpenRouter, read 2026-09-24
• Artificial Analysis Agentic Index: 50.9 published by Artificial Analysis OpenRouter, read 2026-09-24