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Anthropic

Claude Fable 5

Claude Fable 5 is Anthropic's most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Claude Fable 5 runs long, complex, and asynchronous tasks with fewer check-ins and is available on AI Gateway via anthropic, vertexAnthropic with adaptive thinking and configurable effort.

ReasoningTool UseExplicit CachingFile InputVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'anthropic/claude-fable-5',
  prompt: 'Why is the sky blue?'
})
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