Anthropic Releases Fable and Mythos 5.2: New AI Models, Benchmarks, and Interactive 3D Horse Demo

Anthropic has launched Fable and Mythos 5.2, new versions of its AI models that are faster and cheaper than their predecessors. This breakdown covers the pricing changes, the model lineup differences, benchmark results across coding, math, hardware design, and robotics, as well as a detailed look at a realistic interactive 3D horse generated by the model.

■ New Model Release
- Fable and Mythos 5.2: same base model, with Mythos being the unrestricted version for enterprises and Fable having built-in guardrails
- Updated pricing at $8 input and $40 output, down from $10.50 in the previous version
- Anthropic's recommendation to use Opus 5.5 for most tasks and switch to Fable when needed

■ Capabilities and Benchmarks
- Operating system built from scratch by 1,000 sub-agents over 8 days, booting on a real laptop
- Math proof completed in 30 hours that Opus 5.5 could not finish with the same setup
- Hardware design collaboration with Diode: voice assistant hub, USB speakerphone, and handheld virtual pet
- Performance comparisons against GPT-6 Astra and Gemini 4 Carbon on automation and robotics benchmarks

■ Interactive 3D Horse Demo
- A realistic horse generated in 43 minutes using signed distance fields, inverse kinematics, and real-time rendering
- Mouse-tracking head movement, arrow-key steering, and smooth gait transitions
- Vertex and bone count comparisons between Opus 5.5 and Fable versions
- The horse is available to interact with in a browser at typescript.dev

■ Sponsor Segment
- Mux video infrastructure and Mux Robots AI workflow features

This is suited for developers, AI enthusiasts, and tech professionals who want a concise overview of the latest model releases and real-world performance data. Viewers will gain an understanding of what these models can accomplish, how they compare to competitors, and where to try the interactive demo themselves.