glm-5.3 — API, Pricing & Context Window | Vivgrid

glm-5.3 is Zhipu AI's newest coding model. It keeps the glm-5.2 base model and 1M-token context window, and puts its gains into post-training: better long-horizon agent behaviour, more reliable multi-step tool use, and stronger results on coding benchmarks — at the same price as glm-5.2.

On Vivgrid, glm-5.3 is reachable through the unified, OpenAI-compatible endpoint, so it integrates cleanly alongside models from OpenAI, Anthropic, Google, and DeepSeek under one API key.

Specifications

Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

Quick start

Call glm-5.3 through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the Vivgrid Console.

curl https://api.vivgrid.com/v1/chat/completions \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.3",
    "messages": [
      { "role": "user", "content": "Say hello in English, Chinese and Spanish." }
    ],
    "stream": true
  }'

Ideal use cases

• Long-horizon coding agents that chain many tool calls
• Whole-repository reasoning within a 1M-token context
• Cost-effective drop-in upgrade from glm-5.2 at identical pricing
• Teams diversifying beyond US-based providers

Related models

• glm-5.2 — same base model and price, prior post-training
• glm-5.1 — earlier generation with a 200K context
• kimi-k3 — alternative frontier coding model with a 1M context