Z.ai: glm-5.3
glm-5.3 is a production text model for chat, coding, long-context reasoning, and tool-enabled workflows through Flatkey-compatible API access.
Live model health
30-day health, measured on real traffic
Performance uses Flatkey request telemetry from the last 30 days when enough traffic is available.
Model catalog
Available catalog entries
Flatkey routes your request to available upstream channels for this model and keeps billing under one account.
| Provider | Model ID | API | Status |
|---|---|---|---|
| Z.ai | glm-5.3 | anthropic | Live |
Related models
Keep exploring Flatkey
Related models from the pricing catalog.
FAQ
Frequently asked questions
Use the pricing section above for current Flatkey prices from our pricing API.
What is glm-5.3?
glm-5.3 is a production text model for chat, coding, long-context reasoning, and tool-enabled workflows through Flatkey-compatible API access.
How much does glm-5.3 cost?
Use the pricing section above for current Flatkey prices from our pricing API.
Which providers serve glm-5.3?
The providers section shows the upstream provider names available in our model catalog.
Does this use the same model id in my SDK?
Yes. Keep your SDK and switch base_url plus api_key.
Can I control usage before scaling?
Yes. Plan limits, usage analytics, and one invoice keep spend bounded.