Tuesday, June 09, 2026

AI: Anthropic Claude Fable 5 & Mythos 5

 Claude Fable 5 and Claude Mythos 5 \ Anthropic


"...launching Claude Fable 5: a Mythos-class1 model that we’ve made safe for general use.

Fable 5’s capabilities exceed those of any model we’ve ever made generally available. It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in software engineering, knowledge work, vision, scientific research, and many other areas. The longer and more complex the task, the larger Fable 5’s lead over other models."


In order to access Claude Fable 5 model, you must opt into data sharing by using the Data Retention API and setting provider_data_share before you can invoke the models. There is no console user interface for this setting at launch.
This mode allows Amazon Bedrock to retain and share your inference data with model providers per their requirements. Anthropic requires 30-day inputs and outputs retention, as well as human review. To learn more, visit the Amazon Bedrock abuse detection.

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