Claude Fable 5: Anthropic's most powerful model for SMEs

What has changed: the first publicly available Mythos model

On June 9, 2026, Anthropic announced the release of Claude Fable 5 . According to the company, this is the most powerful model ever made available on a large scale. Fable 5 belongs to the class Mythos , a family of AI models that until today had remained outside public distribution.

The reason for the delay was explicit: Anthropic had stated that the Mythos models showed such advanced capabilities in cybersecurity that they could be potentially dangerous. However, the development of new security mechanisms has changed the situation. As reported by The Verge , the release was made possible by "new safeguards that block responses in specific high-risk areas" .

Therefore, this launch is not just a technical update. It represents a turning point in Anthropic's distribution policy and in how the industry manages high-capacity frontier models.

Performance Architecture: where Fable 5 outperforms the competition

Anthropic describes Claude Fable 5 as exceptional in three main domains: software engineering , knowledge work and vision . These three areas are not chosen randomly. They cover most high-value business use cases.

In particular, the company emphasizes a strategic element: the advantage over other models grows as the length and complexity of tasks increase. This means Fable 5 is not optimized for short answers or simple queries. Instead, it expresses its potential on articulated workflows, in-depth analyses, and multi-step processes.

So, for companies using AI on complex tasks — from drafting technical documents to analyzing images and data — the qualitative leap could be substantial. According to research by McKinsey on the topic of AI in business , the greatest benefits are concentrated precisely in knowledge-intensive processes.

Mythos class safeguards: security as an access condition

The history of the Mythos class is emblematic. Anthropic had developed these models but had chosen not to release them. The reason was their capability in offensive cybersecurity. So, the problem wasn't the quality of the model, but its potential for abuse.

The solution adopted introduces selective blocks on responses in high-risk areas. This is not a generic approach. Instead, Anthropic has worked on specific content categories, leaving capabilities in productive domains intact.

This approach is consistent with the philosophy of responsible scaling that the company has publicly adopted. Despite this, the debate on the governance of frontier models remains open. Organizations like the NIST continue to develop reference frameworks for AI risk assessment.

Immediate impact for Italian SMEs in knowledge work

For Italian SMEs operating in the B2B sector, the implications of this release are significant. Fable 5 is designed to excel precisely in the tasks that characterize the daily work of professional studios, agencies, manufacturing companies with technical offices, and structured retail businesses.

For example, the ability in software engineering can accelerate the internal development of tools and automations. Similarly, the performance in knowledge work support the production of documentation, contract analysis, and report writing. Finally, the capabilities vision open up scenarios for the analysis of product images, planograms, and visual materials.

We at SHM Studio we work daily with AI tools to support SMEs in the processes of