Bolt.new Integrates Claude Fable 5, First Mythos-Class Model, for Complex Web Apps

bolt.new

Jun 10, 2026

Bolt.new has integrated Anthropic's Claude Fable 5, the first publicly available Mythos-class model, into its Max agent. This brings advanced problem-solving capabilities to web application development, enabling the Max agent to handle more complex tasks efficiently.

Bolt.new has integrated Anthropic's Claude Fable 5 into its Max agent. This is the first publicly available "Mythos-class" model. Claude Fable 5 is designed to tackle more complex problems using fewer tokens (the fundamental unit of text processing for LLMs).

Model Class: Mythos-class
Capability: Handles more complex problems
Efficiency: Uses fewer tokens
Milestone: First publicly available Mythos-class model

This integration is significant because previous "Mythos-class" models, such as the Claude Mythos Preview, were restricted due to advanced capabilities. Claude Fable 5 now makes frontier AI capabilities, like those demonstrated by Claude Mythos in autonomous engineering, available for complex tasks like software engineering.

The Bolt.new platform now leverages Claude Fable 5 within its Max agent to autonomously generate and iterate on web applications. This enables more sophisticated interactive prototyping and design directly within the browser-based IDE.

Fable 5 now on bolt.new — Fable 5 integration enables advanced interactive prototyping and design capabilities directly within the bolt.new browser-based IDE environment.

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bolt.new

@boltdotnew11h ago

Claude Fable 5 is now in Bolt. The first ever Mythos-class model 🤯 Handles more complex problems with fewer tokens. Now part of Bolt’s Max agent. Let’s cook! https://t.co/qm8aqXzIYR

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