Anthropic launches Claude Fable 5.2, Mythos 5.2 AI models

San Francisco-based AI Company Anthropic has unveiled two new artificial intelligence models—'Claude Fable 5.2' and 'Claude Mythos 5.2'—in a move aimed at strengthening its market position against rival OpenAI while preparing for an initial public offering (IPO).

Announced on Monday (November 9), the newly introduced models deliver up to 30 per cent faster processing speeds compared to their predecessors.

Claude Fable 5.2 has been engineered specifically for software coding, complex reasoning, and AI agent-based tasks. Meanwhile, Claude Mythos 5.2 is designed for advanced cybersecurity applications and biological research.

Access to the models varies based on organizational clearance. Mythos 5.2 will be made available exclusively to vetted institutions participating in Anthropic's verification and authorization initiative to mitigate safety risks associated with cybersecurity and biological research. Conversely, Fable 5.2 is accessible to a broader user base via the Claude API.

According to technical specifications released by Anthropic, Fable 5.2 generates outputs up to 30 per cent faster than the previous Claude 5.1 generation while exhibiting enhanced capabilities across coding, economic modeling, scientific reasoning, and multimodal image processing.

Anthropic has also revised its pricing structure downwards for the new iteration, setting costs at $8 per million input tokens and $40 per million output tokens.

While both models share a foundational technical architecture, Anthropic confirmed that Fable 5.2 incorporates supplementary safety guardrails designed to address potential risks in biological and cyber domains. Accompanying the release, the company published a comprehensive "System Card" detailing its safety evaluation protocols and risk assessment benchmarks.

Within Anthropic's model hierarchy, the Mythos tier is positioned above Opus. The latest release follows the launch of Claude Haiku 5.5 in October, which joined Opus 5.5 and Sonnet 5.5 as part of the company's compact model lineup.

Anthropic recommends Fable 5.2 and Mythos 5.2 for complex, open-ended technical workflows.

-SA