Claude Fable 5.1
By anthropic
anthropic/claude-fable-5.1Claude Fable 5.1 improves on Fable 5 across long-running agentic coding, knowledge work, and research, following instructions precisely over sessions that run unattended for hours.
ReleasedAug 31, 2026
Pricing
Pricing (Input)$10.00/M
Pricing (Output)$50.00/M
CachingYes
Limits
Context Length1M
Max Output Tokens128K
Input Modalities
TextSupported
ImageSupported
PDFSupported
AudioNot supported
Output Modalities
TextSupported
ImageNot supported
AudioNot supported
Features
ReasoningSupported
ToolsSupported
TemperatureSupported