GLM-Z1 Models by Tsinghua Knowledge Engineering Group (THUDM)
Last refreshed 2026-10-02. Next refresh: weekly.
Capabilities
About
GLM-Z1 is the reasoning line of the open GLM-4-0414 model series from THUDM (now published under the zai-org organization on Hugging Face). GLM-Z1-32B-0414 is a deep-thinking model built from GLM-4-32B-0414 through a cold start, extended reinforcement learning, and further training on math, code, and logic tasks, plus general RL from pairwise ranking feedback. GLM-Z1-Rumination-32B-0414 thinks for longer on open-ended, research-style problems and can call search tools while it reasons, aimed at complex retrieval and report-style writing. GLM-Z1-9B-0414 applies the same techniques to a small 9B model for lightweight, resource-constrained deployment.
Decision facts
- Best fit
- reasoningcodingmath-heavy prompts
- Capability starting point
- GLM Z1 Rumination 32B with 128K context and reasoning
- Lowest tracked input
- GLM-Z1 9B · $0.200/1M · Fireworks AI
- Closest related family
- ChatGLM-4
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
Use when the workload needs 128K context and 32B parameters.
Use when the workload needs reasoning, 128K context, and 32B parameters.
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| GLM-Z1 9B | Use when the workload needs 9B parameters. | 2025-01 | 9B parameters | Current |
| GLM Z1 32B | Use when the workload needs 128K context and 32B parameters. | 2025-01 | 128K context32B parameters | Current |
| GLM Z1 Rumination 32B | Use when the workload needs reasoning, 128K context, and 32B parameters. | 2025-01 | reasoning128K context32B parameters | Current |
Release Timeline
1 release groupSpecifications(3 models)
| Model | Released | Context | Parameters | Reasoning |
|---|---|---|---|---|
| GLM-Z1 9B | 2025-01 | — | 9B | No |
| GLM Z1 32B | 2025-01 | 128K | 32B | No |
| GLM Z1 Rumination 32B | 2025-01 | 128K | 32B | Yes |
Available From(1 provider)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| GLM-Z1 9B | Fireworks AI | $0.2 | $0.2 | Serverless |
| GLM Z1 Rumination 32B | Fireworks AI | $0.9 | $0.9 | Serverless |
| GLM Z1 32B | Fireworks AI | $0.9 | $0.9 | Serverless |
