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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
Integrations
C
C#
C++
CSS
Cheaper Inference
Cherry Studio
Cursor
Factory Droid
Java
JavaScript
Integrations
C
C#
C++
CSS
Cheaper Inference
Cherry Studio
Cursor
Factory Droid
Java
JavaScript
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/