Anthropic: Claude Fable 5 API
Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-06-08
- Knowledge cutoff: 2025-11-30
Frequently Asked Questions
What is the context window of Claude Fable 5?
Claude Fable 5 supports a context window of up to 1,000,000 tokens.
Does Claude Fable 5 support function calling?
Yes. Claude Fable 5 supports tool / function calling.
Does Claude Fable 5 support reasoning?
Yes. Claude Fable 5 is a reasoning-capable model.
What is the knowledge cutoff of Claude Fable 5?
The knowledge cutoff of Claude Fable 5 is 2025-11-30.