Claude Mythos

What is Claude Mythos?

Claude Mythos is Anthropic’s model line for cybersecurity and biology research. The page describes Mythos 5 as the latest update to Mythos Preview and positions it as the company’s most capable model for work in cybersecurity, biology, and healthcare.

Access is intentionally limited. According to the source, Claude Mythos 5 is currently available only to a small set of vetted partners through trusted access programs, with broader availability planned for the future. The same page also notes that Mythos-level capabilities are paired with additional safeguards because the model could be used for both beneficial and harmful purposes.

Key Features

• Designed for cybersecurity and biology research, with benchmark leadership called out in cybersecurity, biology, and healthcare.
• Latest release in the Mythos line: Claude Mythos 5 is presented as the newest update to Mythos Preview.
• Restricted trusted access program: availability is limited to vetted partners, reflecting the dual-use sensitivity of the model.
• Safety-oriented deployment controls: the page says Anthropic added additional safeguards around Mythos-level capabilities.
• 30-day data retention requirement: use of Mythos 5 requires accepting a 30-day data retention policy for safety monitoring.
• Published pricing is usage-based: $10 per million input tokens and $50 per million output tokens.

How to Use Claude Mythos

Organizations interested in Claude Mythos 5 would typically need to join Anthropic’s trusted access program and meet vetting requirements before getting access. Once approved, teams can use it for cybersecurity and biology research workflows, while following the required data retention policy and safety constraints described by Anthropic.

Use Cases

• Security research teams analyzing code or systems for vulnerabilities in controlled, vetted environments.
• Biology researchers exploring dual-use research questions where access and safeguards matter.
• Healthcare-oriented research workflows that benefit from a model positioned as strong on healthcare benchmarks.
• Organizations participating in Anthropic’s trusted access programs and evaluating dual-use model deployment policies.
• Teams comparing protected access models for sensitive research tasks that require monitoring and restricted rollout.

FAQ

Who can access Claude Mythos 5? The page says access is limited to a small set of initial testing partners and other vetted customers through trusted access programs.

What kinds of work is it intended for? Anthropic positions Claude Mythos 5 for cybersecurity and biology research, and also says it is state-of-the-art in healthcare benchmarks.

Is Claude Mythos 5 generally available? No. The source says it is not broadly available yet and that Anthropic aims to expand access in the future.

Are there special usage requirements? Yes. The page states that using Mythos 5 requires accepting a 30-day data retention policy for safety monitoring.

Alternatives

• Claude Fable 5: Anthropic’s safer general-access version of the same underlying model, with safeguards that route risky cybersecurity and biology queries away from the model.
• General-purpose frontier AI models: Other large language models may fit broader knowledge work or coding, but they are not described here as specialized for dual-use research.
• Traditional cybersecurity analysis tools: Purpose-built security scanners and research tools can support vulnerability discovery, but they do not provide the same natural-language research workflow.
• Specialized biology research software: Domain tools for wet-lab or computational biology workflows may be better suited when the task requires specialized scientific interfaces rather than a general model.