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GLM-5.3

Complex coding and long-horizon agentic work

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Overview

GLM-5.3 is Z.ai's open-weights reasoning model, aimed at complex coding and long-horizon tasks. It shares its base model with GLM-5.2, and Z.ai attributes every change to post-training. It reasons before answering, and this deployment returns the reasoning and any tool calls in their own response fields.

Strengths

  • Built for complex coding and long-horizon tasks
  • Tool calling alongside separately returned reasoning
  • 250K-token context window

Use cases

  • Coding agents with many tool calls per task
  • Long multi-step tasks that must stay on track

Good to know

Text input only on this alias.

API access

One OpenAI-compatible API for every model in the catalog, plus the CLI and the function SDK inside workflows. Sign up free, add a card for $5 in credits, and these requests work:

glm-5.3 · curl
curl https://gateway.graphn.ai/v1/chat/completions \
  -H "Authorization: Bearer $GRAPHN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.3",
    "messages": [{"role": "user", "content": "Hello"}]
  }'