What it feels like to work with Mythos
oneusefulthing.org
June 9, 2026
9 min read
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64/100
Summary
Claude 5 Fable is the first publicly released model in the Mythos class. It demonstrates significant advancements over previous AI models, although its guardrails restrict its use in cybersecurity applications.
Key Takeaways
- Claude 5 Fable, a Mythos-class AI model, significantly outperforms previous public AI models in various tasks, demonstrating a major advancement in AI capabilities.
- Fable can execute complex projects, such as creating an isochrone map, by conducting extensive research and making nuanced decisions autonomously.
- The AI's output includes sophisticated academic papers and creative works, such as a 10-page epic poem, showcasing its versatility across different domains.
- Users experience a mix of delight and unease when interacting with Fable, as it can produce results quickly and effectively from vague prompts.
Coverage & discussions
Hacker News · oneusefulthing.org
Community discussions
Hacker News discussion ↗
Historical count: 5 · 5 saved in sample · Historical sample
Analysis ready
Community Sentiment
Positives
- Mythos shows promise in tackling complex coding tasks, as evidenced by its ability to generate substantial outputs from a design document in a relatively short time.
- The iterative process of using AI models like Fable for code verification can enhance accuracy, as it identifies errors and suggests improvements effectively.
Concerns
- The article lacks substance regarding the quality and maintainability of the code produced by Mythos, raising concerns about its practical application in real projects.
- Long processing times for generating code can lead to inefficiencies, with some users reporting waits of over 10 minutes for non-trivial requests.
