Anthropic has officially rolled out its latest artificial intelligence models, Claude Fable 5.2 and Mythos 5.2, engineered to tackle highly complex technical challenges previously requiring extensive human effort and time. These advanced AIs are set to revolutionize fields from software development to scientific discovery and hardware design, offering significant speed enhancements over their predecessors.
Enhanced Capabilities for Complex Projects
The new models extend beyond conventional AI applications, demonstrating capabilities in areas such as coordinating large-scale software projects. In a notable experiment, Claude Fable 5.2 orchestrated over a thousand AI agents to develop an experimental operating system prototype within eight days. This prototype included essential components like drivers, storage, a windowing system, a login screen, and an installer.
Fable 5.2 also proved adept at code optimization, successfully rewriting a software service from Python to Rust, resulting in a 26-fold increase in startup speed. Furthermore, its design prowess was showcased through the creation of three functional electronic devices: a home voice-assistant hub, a USB speakerphone, and a handheld virtual pet, with manufacturing support from Diode.
Advancements in Science and Cybersecurity
The scientific applications of Claude Fable 5.2 are equally impressive. A thousand Fable agents collectively converted an existing proof of Fermat’s Last Theorem into a computer-checkable mathematical format in just 30 hours. The model also reportedly solved two open problems related to black holes and exhibited improvements in robotics tasks.
Mythos 5.2, meanwhile, has been rigorously tested in cybersecurity and biological research. It demonstrated superior ability in identifying software vulnerabilities compared to earlier models and accurately predicted the structures of 28 out of 34 tested virus protein shells, offering a significant leap in predictive biology.
Speed, Pricing, and Availability
Both Claude Fable 5.2 and Mythos 5.2 deliver responses up to 30% faster than previous versions. Standard pricing is set at $8 per million input tokens and $40 per million output tokens. For users requiring even quicker processing, an optional fast mode boosts token generation speed by up to 2.5 times, priced at $16 per million input tokens and $80 per million output tokens.
Claude Fable 5.2 is broadly accessible through various Claude platforms, Amazon Web Services (AWS), Google Cloud, and Microsoft Azure. However, access to Mythos 5.2 is more restricted, limited to verified organizations operating in sensitive domains like cybersecurity and life sciences.
Anthropic notes a 55% reduction in unnecessary safety blocks during early testing of Fable 5.2, alongside strengthened safeguards against attempts to extract model capabilities. For everyday coding and knowledge-based tasks, Anthropic continues to recommend Claude Opus 5.5, positioning Fable and Mythos for the most demanding technical work.