# Claude Fable 5 in 7 Minutes

Source: https://www.youtube.com/watch?v=Pl7uo3vqp5s
Recap page: https://rapidrecap.app/video/Pl7uo3vqp5s
Generated: 2026-06-10T14:12:18.592+00:00

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## Quick Overview

Anthropic released Claude Fable 5 and Claude Mythos 5, the most capable and safe models to date, which significantly outperform previous versions across all major benchmarks including software engineering, knowledge work, and scientific research. The models are immediately available for use in the Claude platform and API, with pricing set at $10 per million tokens for input and $50 per million tokens for output.

**Key Points:**
- Claude Fable 5 and Claude Mythos 5 deliver state-of-the-art performance across all tested AI capability benchmarks.
- The models exhibit exceptional proficiency in complex tasks like software engineering, scientific research, and advanced agentic coding.
- Anthropic implemented robust safety measures, resulting in less than 5% of queries triggering safety refusals.
- Pricing for both models is fixed at $10 per million input tokens and $50 per million output tokens.
- Claude Mythos 5 is currently available exclusively through the Project Glasswing initiative for a limited group of partners.
- Claude Fable 5 is available to all users starting June 9, 2026, through the Claude API and managed agent interfaces.

![Screenshot at 00:23: The performance benchmark table showcasing the significant gains in agentic coding and knowledge work capabilities compared to previous models.](https://ss.rapidrecap.app/screens/Pl7uo3vqp5s/00-00-23.jpg)

**Context:** Anthropic recently expanded its AI model lineup with the launch of Claude Fable 5 and Claude Mythos 5. These models, designed for high-stakes professional and scientific environments, represent a significant advancement in the company's 'Mythos' class of AI. The release follows several months of testing and development aimed at improving agentic capabilities, spatial awareness, and long-context performance, while maintaining strict safety standards required for general commercial and research use.

## Detailed Analysis

Claude Fable 5 and Claude Mythos 5 represent a major leap in Anthropic's AI capabilities, specifically engineered for high-performance agentic tasks. The models excel at complex reasoning, coding, and scientific simulation, as demonstrated by their ability to complete tasks like playing video games from raw screenshots and designing 3D models with natural language. Anthropic has prioritized safety, ensuring that even with increased power, the models remain predictable for general use. The company is rolling out access strategically, with Fable 5 available broadly and Mythos 5 limited to specific partners, emphasizing a commitment to responsible deployment. Developers can integrate these models through updated API endpoints, and the company recommends a shift in prompting strategies to leverage the models' improved autonomous thinking capabilities.

### Benchmark Performance

- Fable 5 shows significant improvement across agentic coding and knowledge work
- Scientific domains like biology and health demonstrate state-of-the-art results
- Complex tasks show higher performance gains compared to simpler requests

### Model Availability and Pricing

- Both models are priced at $10 per million input tokens and $50 per million output tokens
- Claude Fable 5 is available to the general public immediately
- Claude Mythos 5 is restricted to the Project Glasswing partner program

### Technical Capabilities

- The models demonstrate advanced spatial awareness in CAD design
- Fable 5 successfully navigates and completes games without external helpers
- Agentic loops can now be managed more effectively with automated cadence

### Implementation Recommendations

- Update to the latest SDKs to access the new model IDs
- Use higher effort settings for complex tasks while utilizing low/medium settings for general use
- Revise existing prompts as they may be overly prescriptive for the more capable models

![Screenshot at 00:23: Benchmark comparison table illustrating the performance superiority of Claude Fable 5](https://ss.rapidrecap.app/screens/Pl7uo3vqp5s/00-00-23.jpg)
![Screenshot at 02:02: FrontierCode chart highlighting the correlation between cost and accuracy for the new models](https://ss.rapidrecap.app/screens/Pl7uo3vqp5s/00-02-02.jpg)
![Screenshot at 04:24: Demonstration of Fable 5 designing a 3D-printable lighthouse in a browser-based CAD environment](https://ss.rapidrecap.app/screens/Pl7uo3vqp5s/00-04-24.jpg)
![Screenshot at 05:39: Code snippet showing the implementation of the new model ID in the Anthropic messages API](https://ss.rapidrecap.app/screens/Pl7uo3vqp5s/00-05-39.jpg)