Z.ai Releases GLM-5: 744B Parameter Open-Source Powerhouse

Technical Specifications

GLM-5 represents a significant scaling increase from its predecessor. The model grows from 355B parameters (32B active) to 744B parameters (40B active), with pre-training data expanding from 23T to 28.5T tokens. A notable architectural addition is the integration of DeepSeek Sparse Attention (DSA), which reportedly "reduces deployment cost while preserving long-context capacity."

Performance Highlights

The model demonstrates strong capabilities across multiple evaluation frameworks:

Academic Benchmarks: Achieves "best-in-class performance among all open-source models" in reasoning, coding, and agentic tasks

Real-World Tasks: On CC-Bench-V2, GLM-5 significantly outperforms GLM-4.7 in frontend, backend, and long-horizon tasks

Long-Horizon Planning: Ranks #1 among open-source models on Vending Bench 2, completing a simulated year-long business scenario with a final balance of $4,432

What Makes It Significant

Beyond scaling, GLM-5 introduces slime, described as "an asynchronous RL infrastructure that substantially improves training throughput and efficiency." This addresses a critical challenge: deploying reinforcement learning at scale for large language models.

The model is purpose-built for "complex systems engineering and long-horizon agentic tasks," positioning it as a bridge between traditional language models and autonomous agent capabilities.

Background

The release received significant attention, scoring 730 points on Reddit's LocalLLaMA and 289 points on singularity. Z.ai openly acknowledged GPU scarcity, stating "compute is very tight."