Language model
GLM-5.3 Flash
Z.ai's efficient open model for high-volume chat and extraction.
- Status
- Available
- Parameters
- 320B
- Active
- 18B
- Context
- 1M
- Best for
- High-volume chat, extraction, and classification
Model IDs
| Model ID | Use |
|---|---|
glm-5.3-flash | High-volume chat, extraction, and classification |
glm-5.3-flash-eu | European provider endpoint |
Use one of the model IDs above with Chat Completions or Responses at https://tarka.rest/v1.
Pricing
glm-5.3-flash: $0.1485 input · $0.0297 cached input · $0.495 output per million tokens
glm-5.3-flash-eu: $0.1485 input · $0.0297 cached input · $0.495 output per million tokens
Overview
GLM-5.3 Flash is Z.ai’s open-weight mixture-of-experts model, released under the MIT license. It has 320 billion parameters, 18 billion of them active for each token, and a context of about a million tokens. It reasons before it answers by default.
When to pick it
- High-volume chat, summarization, and extraction
- Classification and routing steps inside an agent
- Long documents and transcripts that fit in its context
When to look elsewhere
- The hardest coding and agent work: try Kimi K3
- Fast general-purpose chat with tool use: compare DeepSeek V4.1 Flash
In a tool loop
When a response carries reasoning_content, send it back with that assistant
message in the next request, so the model keeps its earlier reasoning.