Claude Mythos 5

Claude Mythos 5

Anthropic
SWE-2

SWE-2

Cognition
+
+

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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

SWE-2 is Cognition’s advanced coding model designed to improve software engineering performance while reducing the cost of agentic coding workflows. The model is post-trained from Kimi K3 and uses reinforcement learning to optimize multiple reasoning-effort levels within a single training run. SWE-2 is designed to explore codebases more selectively, begin implementation sooner, and complete tasks with fewer redundant reads and reasoning steps than earlier Cognition models. Its capabilities include code generation, debugging, test creation, verification, repository analysis, and complex terminal-based software engineering tasks. The model also emphasizes stronger engineering judgment, end-to-end test coverage, instruction following, and evidence-based verification of user assumptions. SWE-2 is available through Devin Desktop and Devin CLI, with broader rollout planned across Devin Web and Fusion.

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 developers, engineering teams, AI coding agent users, DevOps professionals, and organizations that need capable agentic software engineering with lower execution cost and more efficient reasoning

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

$20/month
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
design 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 biggest thing that stands out is the cost-performance balance. SWE-2 is not just trying to top one benchmark; it is trying to get very close to frontier coding performance at a much lower cost. For developers, that matters a lot. Coding agents can burn through tokens quickly when they are reading files, making edits, running tests, and iterating. A model that performs near the top while being meaningfully cheaper is much easier to use every day. I also like that SWE-2 seems built for real software engineering workflows, not just isolated code snippets. The strong DeepSWE and Terminal-Bench results make it especially interesting for repo-level tasks, debugging, tool use, and longer agent runs.

Cons

  • Benchmarks are useful, but real projects bring messy architecture, flaky tests, undocumented behavior, and weird edge cases.

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

Cognition
Founded: 2023
United States
cognition.com

Alternatives

Alternatives

GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
Claude Fable 5

Claude Fable 5

Anthropic
SWE-1.7

SWE-1.7

Cognition
Claude Opus 5

Claude Opus 5

Anthropic
SWE-1.6

SWE-1.6

Cognition

Categories

Categories

Integrations

.NET
C
CSS
Dart
Devin
Devin Desktop
HTML
JavaScript
Kotlin
Kubernetes
Lua
Objective-C
PHP
Python
Rust
SQL
Solidity
Swift
TypeScript
XML

Integrations

.NET
C
CSS
Dart
Devin
Devin Desktop
HTML
JavaScript
Kotlin
Kubernetes
Lua
Objective-C
PHP
Python
Rust
SQL
Solidity
Swift
TypeScript
XML
Claim Claude Mythos 5 and update features and information
Claim Claude Mythos 5 and update features and information
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