GLM 5.3 Fast available on Baseten

GLM 5.3 Flash is now available through Baseten Model APIs. Send requests to zai-org/GLM-5.3-Flash through our OpenAI-compatible endpoint with your Baseten API key.

GLM 5.3 Flash is Z.ai's latest model with a 1M-token context window, vision, and reasoning. Reasoning defaults to high and can be steered with reasoning_effort (low, high, max).

curl https://inference.baseten.co/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $BASETEN_API_KEY" \
  -d '{
    "model": "zai-org/GLM-5.3-Flash",
    "messages": [{"role": "user", "content": "What is gradient descent?"}]
  }'

For more information, see our docs or for dedicated inference see the GLM 5.3 Fast deployment.