● Covered by 8 sources · 9 reportsMedium impact9 neutral
Claude Mythos 5 AI Cybersecurity Capabilities Expanded, $35M Fund for Open-Source Security
Key points
- Claude Mythos 5 is now in Claude Security and integrating with partner tools.
- A $35 million Defender Advantage Fund launched for open-source security.
- The Cyber Verification Program will be expanded.
- These efforts aim to expand defensive AI access with safety measures.
- Project Glasswing launched in April.
- Project Glasswing gave early access to Claude Mythos Preview and Mythos 5.
- Claude Fable 5 is a broadly available model that blocks dual-use cyber work.
- Claude Fable 5.1 and Claude Mythos 5.1 are new AI models.
- Claude Fable 5.1 and Claude Mythos 5.1 are designed for coding and knowledge work.
- Claude Fable 5.1 is generally available.
- Claude Mythos 5.1 is for trusted access programs.
- Mythos 5.1 safeguards support cybersecurity and life sciences.
- Fable 5.1 costs 25% less than Fable 5 for typical workloads.
- Fable 5.1 costs up to 45% less for highly agentic work.
- Enterprise Frontier Safeguards (EFS) provide complete data privacy.
- Fable 5.1 was released three months after Fable 5.
- Fable 5.1 sets a new standard on coding, knowledge work, and long-running problem-solving tasks.
- Fable 5.1 found the cause of a rare crash for Millennium.
- Fable 5.1 and Mythos 5.1 are the same underlying model.
- Fable 5.1 has a 75% cost reduction for cached context reads.
- EFS allows organizations to retain monitoring data inside infrastructure they control.
- Fable 5.1 is available on Amazon Bedrock and Claude Platform on AWS.
- Fable 5.1 is a Covered Model with additional data retention, safety review, and access policies.
- Fable 5.1 pricing is $0.25 per million for cache reads.
- Fable 5.1 is restricted to API usage and users with Max, Team Premium, and Enterprise Premium plans.
- Pro subscribers can use Fable 5.1 via usage credits.
- Fable 5.1 outperforms Opus 5 and OpenAI’s GPT-5.6 Sol in benchmarks.
- EFS will roll out to users in the fall.
- Anthropic has never trained on enterprise data.
- Fable 5.1 addresses customer feedback on cost, data retention, and overzealous safeguards.
- Dan Shipper of Every CEO stated Fable 5.1 is the strongest, fast, and token-efficient coding model.
- Box CEO Aaron Levie stated Fable 5.1 picked up subtleties Fable 5 missed.
- Lisan al Gaib noted Mythos 5.1 with low reasoning scores the same as its predecessor set to Max reasoning.
Expanded Access to Claude Mythos 5
Claude Mythos 5, an advanced AI model for cybersecurity, is now integrated into Claude Security for enterprise customers. This allows users to scan codebases for vulnerabilities and receive patch suggestions. The model is also being integrated into cybersecurity tools from various partners, making its capabilities accessible through existing defensive platforms.
Safeguarding AI for Defensive Use
The expansion of Claude Mythos 5 follows Project Glasswing, which initially provided the model to a select group of organizations to identify and fix vulnerabilities. The company has developed safety classifiers and safeguards to allow broader access to Mythos-class models, focusing on providing defensive outputs while restricting direct access that could lead to malicious use.
$35 Million Fund for Open-Source Security
A new initiative, the Defender Advantage Fund (0xDAF), has been launched with $35 million in credits. This fund will support organizations working to patch vulnerabilities in open-source projects, automate scanning and patching processes for open-source software, and explore new security approaches. This aims to bolster the security of widely used open-source components.
Cyber Verification Program Expansion
The company also announced plans to expand its Cyber Verification Program. This program currently offers vetted defenders reduced safeguards on Opus, indicating a continued effort to provide advanced AI capabilities to trusted entities for cybersecurity purposes.
Updates
- Fable 5.1 addresses customer feedback on cost, data retention, and overzealous safeguards.
- Dan Shipper of Every CEO stated Fable 5.1 is the strongest, fast, and token-efficient coding model.
- Box CEO Aaron Levie stated Fable 5.1 picked up subtleties Fable 5 missed.
- Lisan al Gaib noted Mythos 5.1 with low reasoning scores the same as its predecessor set to Max reasoning.
- Fable 5.1 and Mythos 5.1 are the same underlying model.
- Fable 5.1 has a 75% cost reduction for cached context reads.
- EFS allows organizations to retain monitoring data inside infrastructure they control.
- Fable 5.1 is available on Amazon Bedrock and Claude Platform on AWS.
- Fable 5.1 is a Covered Model with additional data retention, safety review, and access policies.
- Fable 5.1 pricing is $0.25 per million for cache reads.
- Fable 5.1 is restricted to API usage and users with Max, Team Premium, and Enterprise Premium plans.
- Pro subscribers can use Fable 5.1 via usage credits.
- Fable 5.1 outperforms Opus 5 and OpenAI’s GPT-5.6 Sol in benchmarks.
- EFS will roll out to users in the fall.
- Anthropic has never trained on enterprise data.
- Claude Fable 5.1 and Claude Mythos 5.1 are new AI models.
- Claude Fable 5.1 and Claude Mythos 5.1 are designed for coding and knowledge work.
- Claude Fable 5.1 is generally available.
- Claude Mythos 5.1 is for trusted access programs.
- Mythos 5.1 safeguards support cybersecurity and life sciences.
- Fable 5.1 costs 25% less than Fable 5 for typical workloads.
- Fable 5.1 costs up to 45% less for highly agentic work.
- Enterprise Frontier Safeguards (EFS) provide complete data privacy.
- Fable 5.1 was released three months after Fable 5.
- Fable 5.1 sets a new standard on coding, knowledge work, and long-running problem-solving tasks.
- Fable 5.1 found the cause of a rare crash for Millennium.
- Project Glasswing launched in April.
- Project Glasswing gave early access to Claude Mythos Preview and Mythos 5.
- Claude Fable 5 is a broadly available model that blocks dual-use cyber work.
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Primary sources
GitHub aws-samples/anthropic-on-awsHow outlets covered it
Anthropic has launched new AI models, Claude Fable 5.1 and Mythos 5.1, addressing customer feedback on cost, data retention, and safeguards. Fable 5.1 offers improved performance and is up to 45% cheaper for agentic tasks, while Mythos 5.1 is available through Project Glasswing. These updates aim to make Anthropic's models more accessible and practical for enterprise use.
Anthropic has released Fable and Mythos 5.1, updated versions of its advanced AI models, featuring reduced token costs and fewer false-positive restrictions. The Fable model is now generally available, while Mythos 5.1 remains exclusive to partners in cybersecurity and life sciences research, and a new zero-data-retention service will roll out for enterprise clients.
Anthropic has launched Fable 5.1 and Mythos 5.1, updated versions of its flagship AI models, offering stronger performance and a 75% reduction in cache read pricing. Fable 5.1 is generally available, while Mythos 5.1 is restricted to a trusted access program for cybersecurity and life sciences applications. These updates aim to provide more capable and cost-effective AI solutions for users.
Anthropic has released Claude Fable 5.1 on Amazon Bedrock and Claude Platform on AWS, offering improved reasoning capabilities for coding, scientific research, and enterprise workflows. This version is designated a "Covered Model," subjecting it to additional data retention, safety review, and access policies, and introduces Enterprise Frontier Safeguards for customer data control.
Anthropic launched its new large language models, Claude Fable 5.1 and Mythos 5.1, which offer improved performance in agentic tasks and knowledge work. The release also includes a 75% cost reduction for cached context reads and a new security architecture, Enterprise Frontier Safeguards (EFS), allowing organizations to control monitoring data.
Anthropic has released Claude Fable 5.1 and Mythos 5.1, updated versions of its most capable AI models. The new models offer improved performance in coding, knowledge work, and problem-solving, along with reduced costs for typical and agentic workloads.
Anthropic has released Claude Fable 5.1 and Claude Mythos 5.1, new AI models designed for coding and knowledge work, offering performance improvements and cost reductions. Fable 5.1 is generally available, while Mythos 5.1 is for trusted access programs with specialized safeguards for cybersecurity and life sciences.
Anthropic is expanding access to its Mythos 5 AI model for cybersecurity applications through partner integrations and an updated Claude Security offering. The company also launched a $35 million Defender Advantage Fund to support open-source project security. This initiative aims to provide advanced AI defensive capabilities to cybersecurity teams while controlling direct model interaction to prevent misuse.
Claude Mythos 5, an AI model for cybersecurity, is now available in Claude Security and will integrate into partner tools. The company also launched a $35 million fund to support open-source software security and plans to expand its Cyber Verification Program. These actions aim to broaden access to advanced AI for defensive cybersecurity while maintaining safeguards against misuse.