GLM-5.3

GLM-5.3

Z.ai
5.0 out of 5 stars
+
+

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About

Claude Mythos 5.2 is an advanced AI reasoning model developed by Anthropic for cybersecurity research, biomedical science, autonomous software engineering, and complex technical problem-solving. The model shares its underlying architecture with Claude Fable 5.2 but provides verified organizations with access to specialized cybersecurity and biological research capabilities that are restricted in the general-purpose version. Its capabilities include vulnerability discovery, secure code analysis, scientific research, protein design, technical investigations, and autonomous agent workflows. Claude Mythos 5.2 demonstrates improved vulnerability identification and scientific reasoning, achieving 76.3% on CyScenarioBench and 89.6% on Anthropic's CVE Rediscovery evaluation. The model generates output up to 30% faster than its predecessor and offers an optional fast mode that increases token generation speed by up to 2.5 times.

About

GLM-5.3 is Z.ai’s frontier coding model designed for complex software engineering, long-horizon agent tasks, and advanced post-training research. The model uses the same base model as GLM-5.2, with improvements coming from scaled post-training across more environments, more diverse tasks, and larger compute investment. GLM-5.3 delivers stronger coding performance, better task ownership, improved benchmark results, and greater efficiency across realistic development workflows. It is built to handle complex coding tasks, production-style engineering work, research environments, automation tasks, and agentic workflows that require multi-step execution. The model also shows emergent cyber capabilities in vulnerability discovery and exploitation-chain reasoning, with safety evaluation and hardening planned before open-weight release.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Verified cybersecurity researchers, penetration testing teams, vulnerability researchers, application security engineers, security research laboratories, biomedical scientists, computational biologists, pharmaceutical researchers, protein engineers, AI researchers, software engineers, and approved organizations seeking advanced cybersecurity analysis, vulnerability discovery, biological research, scientific reasoning, and autonomous technical research capabilities

Audience

Software engineers, coding agent builders, AI researchers, ML infrastructure teams, security researchers, developer tool teams, automation teams, technical leaders, and organizations that need frontier coding models, long-horizon reasoning, production-style software engineering, benchmark-driven model evaluation, reinforcement learning research, coding-agent integrations, reasoning effort controls, ZCode workflows, and advanced technical task automation

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$8 per 1M tokens (input)
$8 per million input tokens and $40 per million output tokens
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5

Pros & Cons from Real Users

Pros

  • The thing I like most is that GLM-5.3 feels aimed at serious engineering work, not casual prompting. It is built around coding agents, long-running software tasks, debugging, and the kind of multi-step execution that actually matters when you are working inside real repos. The post-training jump is also interesting. Z.ai is not just talking about a bigger model; it is pushing the idea that better training on agentic coding and cyber workflows can make the model more useful in practice.

Cons

  • The cybersecurity angle is impressive, but it is also where I would be most cautious. Strong vulnerability discovery and cyber reasoning can be useful for defense, audits, and secure engineering, but I would want very clear controls around how it is used.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Company Information

Z.ai
Founded: 2023
China
z.ai/

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Categories

AI Coding Models Supported
AI Models Supported
AI Vision Models Supported
Foundation Models Supported
Multimodal Models Supported

Categories

Integrations

Amp Supported
C Supported
C# Supported
C++ Supported
Cheaper Inference Supported
Cherry Studio Supported
Claude Code Supported
Claw Code Supported
Factory Droid Supported
Go Supported
JavaScript Supported
JetBrains Junie Supported
Kotlin Supported
PHP Supported
R Supported
Sup AI Supported
Swift Supported
TypeScript Supported
Yonoo Supported
Zo Computer Supported

Integrations

Amp Supported
C Supported
C# Supported
C++ Supported
Cheaper Inference Supported
Cherry Studio Supported
Claude Code Supported
Claw Code Supported
Factory Droid Supported
Go Supported
JavaScript Supported
JetBrains Junie Supported
Kotlin Supported
PHP Supported
R Supported
Sup AI Supported
Swift Supported
TypeScript Supported
Yonoo Supported
Zo Computer Supported
Claim Claude Mythos 5.2 and update features and information
Claim Claude Mythos 5.2 and update features and information
Claim GLM-5.3 and update features and information
Claim GLM-5.3 and update features and information