Claude Mythos 5

Claude Mythos 5

Anthropic
GLM-5.3

GLM-5.3

Z.ai
+
+

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About

Claude Mythos 5 is Anthropic’s most advanced restricted-access AI model, designed for trusted cyberdefenders, infrastructure providers, and select research organizations. It uses the same underlying model as Claude Fable 5 but provides lifted safeguards in approved areas for specialized high-trust use cases. The model delivers exceptional capabilities in cybersecurity, software engineering, scientific research, long-context reasoning, vision, and autonomous task execution. Anthropic initially deployed Claude Mythos 5 through Project Glasswing in collaboration with the U.S. government to help protect critical software and infrastructure. The model also shows strong potential in life sciences, including protein design, molecular biology hypothesis generation, and genomics research. Claude Mythos 5 is built for organizations that need frontier AI capabilities under controlled, trusted-access conditions.

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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Claude Mythos 5 is designed for cyberdefense teams, critical infrastructure providers, government partners, biomedical researchers, life sciences organizations, advanced AI research teams, and trusted enterprises that need restricted access to frontier AI 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
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

$10 per 1 million (input)
$10 per million input tokens and $50 per million output tokens
Free Version
Free Trial

Pricing

Free
Open source
Free Version
Free Trial

Reviews/Ratings

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

Reviews/Ratings

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

Pros & Cons from Real Users

Pros

  • As a cybersecurity professional, Claude Mythos 5 is the most capable AI system I've seen for vulnerability research, threat analysis, and security engineering. It can identify attack paths, analyze complex codebases, and reason through security problems at a level that feels significantly beyond previous-generation models. What stands out most is its ability to connect seemingly unrelated findings into a coherent security assessment. Whether reviewing application code, examining infrastructure risks, or analyzing exploit chains, Mythos 5 consistently provides insights that would normally require multiple senior analysts working together. The model appears particularly strong at vulnerability discovery and defensive security workflows. Its capabilities were significant enough that Anthropic initially restricted access to a small group of trusted organizations before expanding availability through its Project Glasswing program.

Cons

  • The biggest downside is accessibility. Most security professionals cannot simply sign up and use Mythos 5. Access remains limited to approved organizations, which makes it difficult for independent researchers and smaller security teams to evaluate its full potential. The model's power also comes with operational constraints. Organizations using it must navigate additional security controls, monitoring requirements, and deployment restrictions that are not typically associated with mainstream AI tools. There is also a learning curve. Mythos 5 is not a replacement for security expertise—it amplifies expertise. Teams without strong cybersecurity fundamentals may struggle to get the same value from it as experienced practitioners.

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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Anthropic
Founded: 2023
United States
claude.ai

Company Information

Z.ai
Founded: 2023
China
z.ai/

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI

Alternatives

Grok 4.6

Grok 4.6

SpaceXAI
Claude Opus 5

Claude Opus 5

Anthropic
Claude Opus 5

Claude Opus 5

Anthropic
Claude Fable 5

Claude Fable 5

Anthropic
Claude Fable 5

Claude Fable 5

Anthropic
Claude Mythos

Claude Mythos

Anthropic
GLM-5

GLM-5

Z.ai
GLM-5.1

GLM-5.1

Z.ai

Categories

Categories

Integrations

Amp
C#
C++
CSS
Cherry Studio
Claw Code
Cursor
Dessix
Hermes Agent
JavaScript
JetBrains Junie
Kotlin
OpenClaw
PHP
Python
R
Rust
Swift
TypeScript
Zo Computer

Integrations

Amp
C#
C++
CSS
Cherry Studio
Claw Code
Cursor
Dessix
Hermes Agent
JavaScript
JetBrains Junie
Kotlin
OpenClaw
PHP
Python
R
Rust
Swift
TypeScript
Zo Computer
Claim Claude Mythos 5 and update features and information
Claim Claude Mythos 5 and update features and information
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