GLM-5.1 Fast
GLM-5.1 Fast is Zhipu AI's language model with a 203K context window and up to 131K output tokens, starting at $2.80 / 1M input and $8.80 / 1M output. A fast-tier variant of Zhipu's GLM-5.1 LLM, optimized for low-latency inference while maintaining strong general language understanding.
Capabilities
Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities3/13
Reasoning✓
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling·
Structured Outputs✓
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | ||
|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | |
| $2.80 | $8.80 | $0.52 | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| GLM-5.2 | 1.0M | $0.980 | $3.08 | Available | |
| GLM-5V Turbo | 203K | $1.20 | $4.00 | Deprecating | |
| GLM-5 Turbo | 262K | $1.20 | $4.00 | Available | |
| GLM-5.1 Fast | — | 203K | $2.80 | $8.80 | Current |
| GLM-5.1 Non-Reasoning | — | — | — | — | Available |
| GLM-5 Non-Reasoning | — | — | — | — | Available |
| GLM-5 Code | — | 200K | $1.20 | $5.00 | Available |
| GLM-5.1 NVFP4 MTP | — | 203K | $1.40 | $4.40 | Available |
| GLM-4.6V Flash | 128K | — | — | Available | |
| GLM-4 32B | 128K | $0.100 | $0.100 | Available | |
| GLM-4.7 FlashX | 200K | $0.060 | $0.400 | Available |