GLM-4.5

Our Take

A solid 355B-parameter MoE language model from Z.ai. A pragmatic middle-ground choice when you need open weights without a flagship-sized footprint.

Generated from this model’s benchmarks and ranking signals. Editor reviews refine it over time.

Key Specifications:

• Parameters: 355B Total / 32B Active
• Architecture: Mixture-of-Experts (MoE)
• Context Length: 128,000 tokens
• License: MIT (Commercial use permitted)
• Modality: Text-only
• Inference Modes: Supports "Thinking" (complex reasoning/tool use) and "Non-Thinking" (fast response) modes.

The 128k context window is a critical feature for practitioners. It allows for the ingestion of entire code repositories or lengthy technical documentation, which is essential for the model’s primary use cases in coding and complex reasoning. The MIT license is a notable differentiator, providing significantly more freedom for secondary development and commercial deployment compared to the more restrictive licenses found in the Llama or Mistral families.

GLM-4.5 is positioned as a foundation model for "ARC" (Agentic, Reasoning, and Coding). In practice, this translates to superior performance in tasks that require logical branching and precise instruction following.

The model features a native "Thinking Mode," which allows it to perform internal chain-of-thought processing before delivering a final answer. This is particularly effective for mathematical problem solving and scientific computing. On benchmarks like GPQA Diamond and MATH 500, GLM-4.5 has demonstrated performance that rivals top-tier proprietary models, making it a viable local alternative for high-stakes analytical tasks.

Z.ai has optimized GLM-4.5 for tool invocation and web browsing. For developers building agents, this means the model is less likely to hallucinate function arguments and more capable of handling multi-turn tool interactions. It is natively compatible with agent frameworks like Claude Code and Roo Code.

GLM-4.5 excels in "Vibe Coding" (UI/UX generation) and core software engineering. It produces modern, clean code for web front-ends and handles complex terminal-based tasks with high accuracy. Because it was trained on a diverse multilingual corpus, it maintains high performance in both English and Chinese coding environments.

Running a 355B parameter model locally is a significant hardware undertaking. Even with the MoE architecture's efficiency in compute, the VRAM requirements are dictated by the total parameter count, as the entire model must typically reside in memory.

The "weights-in-memory" rule applies here. At 16-bit precision (FP16), the model would require over 700GB of VRAM, which is impractical for local setups. Practitioners must use quantization to bring this model within reach of workstation hardware.

• 4-bit Quantization (Q4_K_M): Requires approximately 200GB - 220GB of VRAM. This is the recommended "sweet spot" for maintaining intelligence while fitting on high-end hardware.
• 8-bit Quantization (FP8/Q8): Requires approximately 380GB - 400GB of VRAM. Recommended only for those with multi-node H100/A100 setups or massive Mac Studio configurations.

• Apple Silicon: An M2 Ultra or M4 Max Mac Studio with 192GB+ of Unified Memory is the most accessible way to run GLM-4.5. While a 192GB machine will be tight for 4-bit, it can run lower quantizations (Q3_K_L) relatively comfortably.
• NVIDIA Multi-GPU: A setup with 8x RTX 4090 (24GB each) provides 192GB of VRAM. Using EXL2 or GGUF formats, you can run a 3.5-bit or 4-bit quantization.
• Data Center Grade: 4x A6000 (48GB each) or 4x L40S cards are ideal for a stable 4-bit local deployment.

The quickest way to run GLM-4.5 locally is via Ollama, which handles the GGUF quantizations and MoE routing logic automatically. For those seeking maximum throughput, vLLM or SGLang are preferred, as they support FP8 versions of the model and optimized kernels for the MoE architecture. In a multi-GPU environment, expect between 5 to 15 tokens per second depending on your quantization level and interconnect speed.

When evaluating whether to run GLM-4.5 locally, it is most often compared against other high-parameter open-weight models.

Llama 3.1 405B is a dense model, meaning every parameter is active during inference. While Llama 405B may offer slightly higher general knowledge saturation, GLM-4.5's MoE architecture makes it significantly faster in terms of tokens per second on comparable hardware. Furthermore, GLM-4.5’s MIT license is less restrictive for large-scale commercial applications than Meta’s Community License.

DeepSeek-V3 is another prominent MoE model. While DeepSeek often leads in pure coding benchmarks, GLM-4.5 is frequently cited for better "agentic" alignment—specifically its ability to follow complex system prompts and handle multi-step tool use without drifting. GLM-4.5 also offers a more robust "Thinking Mode" out of the box for users who need explicit chain-of-thought reasoning.

For users who cannot meet the 200GB+ VRAM requirement, the GLM-4.5-Air variant is the logical alternative. It features 106B total parameters (12B active) and can fit into ~64GB - 80GB of VRAM at 4-bit quantization, making it runnable on a single A100 (80GB) or a dual RTX 4090 setup. While the "Air" version is more efficient, the full GLM-4.5 provides a noticeable jump in "Humanity’s Last Exam" (HLE) and other graduate-level reasoning benchmarks.