Model identifier: claude-fable-5-1.
Anthropic model for demanding reasoning and long-horizon agentic work.
Active model available through the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS. Standard Claude API rates, USD per million tokens: input $10; output $50. Context is documented as 1M tokens and standard maximum output as 128K tokens. Caching, batch and accelerated processing have separate rates. API access terms: https://www.anthropic.com/legal/commercial-terms
Official model documentation: https://platform.claude.com/docs/en/models/fable-5-1/overview Researched on 23 October 2026. Undocumented specifications are omitted.