Artificial intelligence startup Anthropic is making its most advanced AI technology available to a broader audience for the first time, while imposing strict safeguards designed to prevent the system from being used for potentially dangerous cybersecurity activities.
The company on Tuesday unveiled Claude Fable 5, describing it as the most capable model it has released for general use. The launch marks a significant milestone for Anthropic as it seeks to expand commercial adoption of its technology following the global attention generated by its experimental Mythos model earlier this year.
Mythos stunned governments, cybersecurity experts, and technology companies after Anthropic disclosed that the system had identified thousands of previously unknown software vulnerabilities, raising both excitement about its capabilities and concern about how such powerful tools could be misused.
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Until now, access to Mythos has been restricted largely to about 200 organizations participating in Anthropic’s Glasswing program, including U.S. government agencies and selected cybersecurity institutions.
The wider rollout comes at a crucial moment for Anthropic. The company has emerged as one of the most valuable businesses in the artificial intelligence sector, carrying an estimated valuation of $965 billion and increasingly competing head-to-head with rivals such as OpenAI, Google DeepMind, and xAI as the race toward public listings accelerates.
Balancing Power and Safety
Anthropic’s challenge has been how to commercialize a model capable of sophisticated cybersecurity reasoning without enabling malicious actors to exploit those same capabilities. The company said Claude Fable 5 includes extensive safeguards that block users from employing the model to search for software vulnerabilities, conduct offensive cyber operations, or perform other high-risk activities.
Dianne Penn, Anthropic’s head of product management, research, and labs, explained how the restrictions would work in practice.
“Let’s say I’m a college student asking the model like help me find cyber vulnerabilities on X package or code. The model would refuse and Fable 5 will fall back to Opus 4.8 for a response,” Penn told Reuters.
The approach reflects a shift across the AI industry, with companies separating frontier research systems from commercially available products. Rather than releasing raw capabilities directly to consumers, firms are embedding policy controls that limit access to sensitive functions.
Anthropic said it conducted extensive testing to ensure users cannot easily manipulate or jailbreak the system into performing restricted actions.
The original Mythos preview generated attention because it demonstrated capabilities that went beyond traditional coding assistants.
According to Anthropic, the model was able to uncover large numbers of software vulnerabilities, highlighting how advanced AI systems may soon become powerful tools for both cybersecurity defense and cyber offense.
That dual-use nature has become one of the most contentious issues in artificial intelligence development.
Governments view advanced AI models as potential national security assets. The U.S. government has expanded cooperation with Anthropic through initiatives such as Glasswing, while countries including South Korea, Japan, and several European allies have sought access to frontier AI systems for cybersecurity purposes.
The debate has intensified as researchers warn that future generations of AI could autonomously discover and exploit vulnerabilities faster than human experts. Anthropic’s decision to keep unrestricted Mythos access confined to trusted organizations appears aimed at reducing those risks while still enabling legitimate research and security applications.
Anthropic recently confidentially filed for an initial public offering, placing it among a growing list of AI giants preparing to enter public markets. Investors are focused on whether frontier AI developers can convert technological leadership into sustainable revenue growth.
By releasing Claude Fable 5 more broadly, Anthropic gains an opportunity to expand enterprise adoption while preserving safeguards around its most sensitive capabilities. The company said customers already using the preview version of Mythos will be able to upgrade to Claude Mythos 5, while broader access will gradually expand through what it described as a more systematic trusted-access program.
This tiered approach allows Anthropic to monetize cutting-edge technology without fully relinquishing control over its most powerful capabilities.
Cost Efficiency Becomes a New Battleground
Beyond performance, Anthropic is also emphasizing efficiency. Penn said early users have reported that while Fable 5 is positioned as a premium model, it completes tasks using fewer tokens, potentially lowering overall costs for customers.
As enterprises spend billions of dollars deploying AI systems, attention is increasingly moving away from raw model capability toward economics. Companies are now evaluating not only which models perform best, but also which deliver the lowest cost per completed task.
Competition on efficiency is becoming important as businesses scrutinize soaring AI budgets and seek ways to manage spending without sacrificing performance. Anthropic has priced both Claude Fable 5 and Claude Mythos 5 at $10 per million input tokens and $50 per million output tokens.
The artificial intelligence industry’s most advanced models are becoming powerful enough to influence national security, software infrastructure, and critical systems. Yet the same capabilities that make them valuable also create concerns about misuse. Anthropic’s solution is effectively a compromise: make the technology more widely available while limiting access to its most sensitive cybersecurity functions.