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The new model cuts cache read prices by 75%, with savings reaching up to 45% for complex agentic coding tasks
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Anthropic released Claude Fable 5.1 on Tuesday, a new version of its flagship AI model that reduces operating costs and improves coding performance. The company also released Claude Mythos 5.1, an identical model with different safeguard levels available only to vetted partners in cybersecurity and life sciences.
The most significant cost change is a 75% reduction in cache read pricing — the fee charged when the model reuses context it has already processed — dropping to $0.25 per million tokens. For typical workloads, Anthropic said the change will reduce overall costs by around 25% compared to Fable 5. For complex coding and highly agentic tasks, savings could reach approximately 45%. The base price of $10 per million input tokens and $50 per million output tokens remains unchanged.
