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Claude Mythos Preview

by Anthropic

AI Model
Low Confidence

Claude Mythos is an internal Anthropic research model — a frontier AI system developed to test the upper limits of what large language models can do, specifically in the domain of software security and vulnerability research.

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Transparency Score

Weighted across four pillars · updated May 5, 2026

Overall grade
70% weighted
ABCDF
Model
—
Not yet assessed
Infrastructure
—
Not yet assessed
Openness Assessment
7%Closed
1 Open
0 Partial
11 Closed
2 Unknown
Availability
0/5 Open
Documentation
1/6 Open
Access Methods
0/3 Open
Data from EU Open Source AI Index (DOI: 10.5281/zenodo.15386042), licensed under CC-BY 4.0

Capabilities

Text Generation
Conversation
Summarization
Storytelling
Content Creation

Vendor Information

Complete information about the vendor/provider of this AI application

AnthropicView all products →
Anthropic PBC(Trading as: Anthropic)
Contact Information
anthropic.com
press@anthropic.com
Registered Address
548 Market Street, San Fransisco, CA, 94105, US

EU AI Act Provider Information

Verification Status:
Verified
(Last verified: August 3, 2026)
Anthropic PBC(Trading as: Anthropic)
548 Market Street, San Fransisco, CA, 94105, US
press@anthropic.com
Anthropic Ireland, Limited
6th Floor South Bank House, Barrow Street, Dublin, IE
Compliance Documents
CE Marking: Pending
Instructions for Use
Available in EU Member States
🇦🇹AT🇧🇪BE🇧🇬BG🇭🇷HR🇨🇿CZ🇩🇰DK🇪🇪EE🇫🇮FI🇫🇷FR🇩🇪DE🇬🇷GR🇭🇺HU🇮🇪IE🇮🇹IT🇱🇻LV🇱🇹LT🇱🇺LU🇲🇹MT🇳🇱NL🇵🇱PL🇵🇹PT🇷🇴RO🇸🇰SK🇸🇮SI🇪🇸ES🇸🇪SE
The vendor states that its AI models may produce harmful, biased, or inaccurate responses and that research is conducted to understand and mitigate these risks. Techniques like Constitutional AI are used to align models with human values, but limitations in safety, accuracy, and potential reproduction of trained content remain.

Potential Risks

1 considerations identified

1

Review recommended before use

These considerations are automatically identified based on publicly available information about the vendor and AI catalog data. Actual risks may vary based on your specific use case and implementation.

Supply Chain Network

Visual representation of the vendor's digital supply chain relationships

Compliance & Risk

Get insights into risk by running assessments on this AI application.

Work at Anthropic? Claim this listing to correct or complete the data.

Added: April 22, 2026
Updated: May 5, 2026

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