Anthropic launches Claude Fable 5 and Mythos 5 and rewrites the rules of complex automation
Anthropic released today Claude Fable 5, a "Mythos" class model aimed at the general public, and its government counterpart Claude Mythos 5. Fable 5 represents the new state-of-the-art for artificial intelligence capabilities, excelling in software development, knowledge work, and computer vision. Tests confirm extraordinary performance on complex and prolonged tasks. In an experiment conducted by Stripe, the model completed a migration on a 50-million-line Ruby codebase in a single day.
The update introduces exceptional operational autonomy. Fable 5 manages to play Pokémon FireRed autonomously using only visual inputs and builds factories in Factorio by developing long-term strategies entirely on its own. Anthropic set the cost at $10 per million input tokens and $50 for output. The Mythos 5 version, lacking certain safety guardrails and enhanced for cybersecurity, is initially reserved for the US government's Project Glasswing.
Fabrizio's Analysis:
This is the real leap towards the "Agentic AI" we have been waiting for in our workflows. I find the jump in autonomy incredible: running a months-long codebase migration in a single day completely changes the efficiency metrics of my projects. Fable 5 immediately becomes my primary model for complex code generation and orchestrating long-range tasks.
Persistent file-based memory management opens up crazy work scenarios. I can finally build agents that maintain coherent context on multi-step processes without going crazy with external vector databases. I plan to immediately integrate Fable 5 into my automated systems. The $50 output price will hit hard on highly verbose tasks. It is best to use it as a surgical "reasoner" to make architectural decisions or fix critical bugs.
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