Claude Fable 5 is here: Anthropic just took a giant lead

By Futurepedia

Categories: AI, Tools

Summary

Anthropic's Claude Fable 5 is now the world's best AI model, beating GPT-4 and Gemini across all benchmarks, but costs double Opus at $10/$50 per million input/output tokens and switches to usage-based pricing June 22nd—forcing builders to choose between capability and cost.

Key Takeaways

  1. Fable 5 consumes twice the tokens of Opus 4.8, making the $20 Claude plan unsustainable for heavy users; the $200 plan runs out quickly. Builders should budget $10 per million input tokens and $50 per million output tokens.
  2. Fable includes reasoning effort controls (high/extra/max) allowing developers to trade accuracy for cost. Setting to 'extra' improves accuracy significantly but doubles pricing—a key lever for cost optimization.
  3. Mythos 5 (unrestricted version) is restricted to Glass Wing partners only, not available to general users. Fable 5 is the safe alternative with cyber safeguards enabled—same model, different security configuration.
  4. Fable 5 excels at agentic, autonomous long-running tasks spanning entire days and is superior for software engineering and knowledge work across all AI use cases, making it ideal for agent-based applications.
  5. Auto-fallback feature: Claude switches models mid-task if flagged, reverting from Fable to Opus without user notification. Enable 'switch models when message is flagged' setting to control this behavior explicitly.

Related topics

Transcript Excerpt

Claude just introduced two brand new models. One is called Claude Fable 5 and the other one is called Claude Mythos 5. One of them is available to everyone. The other one is only available to a select few. So, let me compare the two for you. The Fable 5 model I have access to right now. So, I'm going to show you a couple of demos here in this video, too. And this slideshow, by the way, was created with the new Fable model inside of Claude Design. So the new model Claude Fable 5, this is available inside of the Claude app right now. It's available in the API. So if you're building with Claude, you could use this one. So this is the very best model they have available today. Is technically the Mythos class model, but is safe for general use. So if you look at this side here, the Mythos 5 mod…

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