Claude Fable 5 FAQ
Short answers for searchers and answer engines.
What is Claude Fable 5?
Claude Fable 5 is Anthropic's generally available frontier Claude model announced with Claude Mythos 5. Its API model ID is claude-fable-5.
What are the main Fable 5 specs?
Anthropic documentation lists a 1M-token context window, 128K maximum output, adaptive thinking always on, and API pricing of $10 input / $50 output per million tokens.
How much does Claude Fable 5 cost?
The listed Claude API price is $10 per million input tokens and $50 per million output tokens. Always check the official pricing page before production use.
Is Claude Fable 5 good for Claude Code?
Yes, especially for complex repository work: migration planning, debugging, test repair, architecture review, and final regression review.
What is Claude Mythos 5?
Mythos 5 is part of the same Anthropic announcement, but should be treated as a separate access and safety topic. Most users evaluating public model use should start with Fable 5.
Is fable-5.ai affiliated with Anthropic?
No. fable-5.ai is an independent site. It cites official Anthropic sources but is not owned by Anthropic.