Anthropic has released Claude Fable 5 — the most powerful model for complex tasks

Anthropic has introduced Claude Fable 5, a fifth-generation model designed to tackle the most complex tasks in programming and knowledge work.

According to the company, Fable 5 can handle multi-day, complex, and asynchronous tasks that previous models struggled with.

Fable 5 supports several key use cases. In agent mode, the model can work in conjunction with tools such as Claude Code over several days: planning tasks step-by-step, delegating subtasks, and monitoring results. In the realm of programming, it handles large-scale projects—such as major migrations, complex implementations, and multi-day autonomous sessions—and uses vision to verify results against initial goals.

In corporate workflows, Fable 5 takes on multi-stage analytical work with minimal human involvement. Enhanced image recognition capabilities allow the model to work with diagrams, tables, and charts in documents and PDFs.

For security reasons, the model is equipped with protective classifiers. Requests related to cybersecurity and biology are automatically redirected to Claude Opus 4.8. However, no fees are charged for redirected requests under the Fable pricing plan.

To use Fable 5, data must be stored for 30 days for security monitoring purposes.

The model is available on the Claude API platform, as well as through Amazon Web Services, Google Cloud, and Microsoft Foundry. The price is $10 per million input tokens and $50 per million output tokens, with a 90% discount on cached tokens. In the API, the model is available under the identifier claude-fable-5.

Source: anthropic.com