Anthropic has just released Claude Fable 5, the very first publicly available model from the highly anticipated Mythos family. Designed to tackle tasks of unprecedented complexity, Fable 5 represents a monumental shift in AI capability. It is available right now to power your Mates on allmates.ai.

⚠️ Crucial Cost Warning: Use with Precision

Claude Fable 5 is an ultra-premium, specialized powerhouse. It costs exactly twice as much as Claude Opus 4.8 ($10 per million input tokens / $50 per million output tokens).

To optimize your organization's credits, do not use Fable 5 for everyday, routine tasks. Reserve this model for highly complex, multi-step, or deeply analytical problems where standard models fall short. For daily operations, Claude Opus 4.8 or Claude Sonnet 4.6 remain your most efficient workhorses.

🔍 What’s New?

Claude Fable 5 brings Mythos-class intelligence out of the research lab and directly into your workflows.

• 🧠 Mythos-Class Reasoning: Fable 5 delivers a significant leap in capability over Opus 4.8, scoring over 10% higher on advanced reasoning, scientific, and knowledge work benchmarks.

• 👁️ State-of-the-Art Multimodal Vision: It features near-perfect visual accuracy. It can parse dense tables, extract precise data from complex charts, and even rebuild code structures from screenshots alone.

• 📚 1-Million-Token Context & 128k Output: Process massive document archives, multi-session projects, or complete codebases in a single, uninterrupted turn.

• 🛡️ Stricter Safety & Automatic Fallback: Fable 5 is built with advanced safety guardrails. If a query touches high-risk domains (like cybersecurity), the system will automatically and safely route the request to Claude Opus 4.8.

✨ Why You’ll Love It

• Solve the Unsolvable: Perfect for deep-dive financial forecasting, massive document synthesis, and long-horizon strategic planning that typically requires hours of human oversight.

• Enterprise-Proven Power: In early testing, companies reported compressing months of complex analytical work into mere days using this new architecture.

• Flexible Deployment: Run it on your terms. Connect your own keys to maintain full control over your billing and quotas.

🛠️ How to Get Started (BYOK)

Because of its premium nature, Claude Fable 5 is available on allmates.ai via your own configured providers:

1. Navigate to your Mate's settings on allmates.ai.

2. Ensure you have active connections set up for Anthropic, Google Vertex AI, or OpenRouter.

3. Select Claude Fable 5 or Latest from the model dropdown list.

We are thrilled to let you explore the absolute frontier of AI collaboration. Use this power wisely!

Happy collaborating,

— The allmates.ai Team