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What is GLM-5.3?

GLM-5.3 is Z.ai’s frontier coding model built to improve complex software engineering, long-horizon agent work, and advanced technical reasoning through scaled post-training. The model uses the same base model as GLM-5.2, with performance gains coming from additional post-training environments, more diverse tasks, and expanded compute on the existing training stack. Z.ai’s stack includes IndexShare for efficient long-context processing, SAO for reinforcement learning on long-horizon tasks, and slime for large-scale asynchronous post-training. GLM-5.3 is designed to perform better on work that resembles real engineering tasks rather than short coding exercises. Its training environments include production-style workflows where the model must diagnose bottlenecks, inspect documentation, use codebases, run experiments, implement changes, and produce measurable improvements. The model improves coding performance across public and private benchmarks, including Terminal Bench 3.0, DeepSWE, Agents’ Last Exam, and Z.ai Code Bench. GLM-5.3 also improves token efficiency, producing stronger agentic coding results than GLM-5.2 while using fewer output tokens in Z.ai’s internal evaluations. The model supports three reasoning effort levels, low, high, and max, and no longer supports disabling thinking. Z.ai recommends max reasoning effort for coding tasks, while applications using disabled thinking must migrate to enabled thinking before switching to GLM-5.3. The release also reports emergent cyber capabilities, including stronger vulnerability discovery and exploitation-chain reasoning, with open-weight release planned after safety evaluation and hardening. By combining scaled post-training, long-context infrastructure, long-horizon reinforcement learning, coding-agent workflows, benchmark improvements, reasoning controls, and ZCode integration, GLM-5.3 helps developers and researchers work on demanding coding and agentic tasks.

What is GLM-4.6?

GLM-4.6 builds on the groundwork established by its predecessor, offering improved reasoning, coding, and agent functionalities that lead to significant improvements in inferential precision, better tool application during reasoning exercises, and a smoother incorporation into agent architectures. In extensive benchmark assessments evaluating reasoning, coding, and agent performance, GLM-4.6 outperforms GLM-4.5 and holds its own against competitive models such as DeepSeek-V3.2-Exp and Claude Sonnet 4, though it still trails Claude Sonnet 4.5 regarding coding proficiency. Additionally, when evaluated through practical testing using a comprehensive “CC-Bench” suite, which encompasses tasks related to front-end development, tool creation, data analysis, and algorithmic challenges, GLM-4.6 shows superior performance compared to GLM-4.5, achieving a nearly equal standing with Claude Sonnet 4, winning around 48.6% of direct matchups while exhibiting an approximate 15% boost in token efficiency. This newest iteration is available via the Z.ai API, allowing developers to utilize it either as a backend for an LLM or as the fundamental component in an agent within the platform's API ecosystem. Moreover, the enhancements in GLM-4.6 promise to significantly elevate productivity across diverse application areas, making it a compelling choice for developers eager to adopt the latest advancements in AI technology. Consequently, the model's versatility and performance improvements position it as a key player in the ongoing evolution of AI-driven solutions.

Media

Media

Integrations Supported

Claude Code
Cline
GLM Coding Plan
Kilo Code
OpenClaw
OpenRouter
Roo Code
Shiori
Sup AI
Amp
C
C#
Dessix
Factory Droid
JavaScript
Python
R
Swift
Yonoo
pandas

Integrations Supported

Claude Code
Cline
GLM Coding Plan
Kilo Code
OpenClaw
OpenRouter
Roo Code
Shiori
Sup AI
Amp
C
C#
Dessix
Factory Droid
JavaScript
Python
R
Swift
Yonoo
pandas

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Open source
Free Version
Free Trial Offered?

Pricing Information

Free
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Z.ai

Date Founded

2023

Company Location

China

Company Website

z.ai/

Company Facts

Organization Name

Z.ai

Date Founded

2023

Company Location

China

Company Website

z.ai/blog/glm-4.6

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