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Description

Claude Fable 5.1 represents Anthropic's most advanced model currently available, tailored for ambitious and extensive knowledge tasks as well as coding endeavors. This model excels in handling intricate assignments that could span hours or even days, demonstrating notable proficiency in fields like software development, scientific inquiry, visual tasks, computer operations, and various professional processes. In applications such as Claude Code or Claude Managed Agents, it possesses the capability to strategize across different phases, assign tasks to sub-agents, evaluate its outcomes, and maintain functionality with minimal oversight. Specifically for coding, it is optimized for substantial migrations, intricate implementations, prolonged autonomous operations, precise design execution, and the creation of self-generated tests that validate its outputs. In the context of enterprise workflows, it adeptly manages in-depth research, multi-tiered analyses, and the generation of final deliverables for team review, reducing the need for constant supervision of each intermediate phase. This makes it an invaluable tool for organizations looking to enhance productivity and efficiency in their projects.

Description

GLM-5.3 is Z.ai’s advanced coding and agentic reasoning model built through scaled post-training on top of the GLM-5.2 base model. The release focuses on frontier coding, long-horizon software engineering, agent tasks, cyber evaluation, and reinforcement learning at scale. GLM-5.3 improves significantly over GLM-5.2 on complex coding benchmarks, real-world engineering environments, Terminal Bench 3.0, DeepSWE, Agents’ Last Exam, and Z.ai’s internal Code Bench. The model is trained on environments that resemble real professional work, including tasks involving codebases, infrastructure, documentation, compute clusters, experiments, bottleneck diagnosis, implementation, testing, and measurable optimization. Z.ai’s post-training stack includes IndexShare for efficient long-context processing, SAO for reinforcement learning on long-horizon tasks, and slime for large-scale asynchronous training. GLM-5.3 supports three thinking effort levels, including low, high, and max, with max recommended for coding tasks. The model also demonstrates emergent cyber capabilities across vulnerability discovery and exploitation benchmarks, prompting continued safety evaluation and hardening before weights are released. GLM-5.3 can be used through the GLM Coding Plan, ZCode, Claude Code, OpenCode, and other coding agent workflows. By combining stronger coding performance, long-horizon task execution, post-training scale, cyber evaluation, reasoning effort controls, and coding-agent integrations, GLM-5.3 supports advanced developer and research workflows.

API Access

Has API

API Access

Has API

Screenshots View All

Screenshots View All

Integrations

C
C#
C++
CSS
Cheaper Inference
Cherry Studio
Cursor
Factory Droid
Java
JavaScript
JetBrains Junie
OpenClaw
Python
R
Rust
SQL
Sup AI
TypeScript
Yonoo
Zo Computer

Integrations

C
C#
C++
CSS
Cheaper Inference
Cherry Studio
Cursor
Factory Droid
Java
JavaScript
JetBrains Junie
OpenClaw
Python
R
Rust
SQL
Sup AI
TypeScript
Yonoo
Zo Computer

Pricing Details

$17 per month
Free Trial
Free Version

Pricing Details

Free
Open source
Free Trial
Free Version

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Vendor Details

Company Name

Anthropic

Founded

2021

Country

United States

Website

claude.ai

Vendor Details

Company Name

Z.ai

Founded

2023

Country

China

Website

z.ai/

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