Claude Fable 5

Claude Fable 5 is a Claude model for creative writing, analysis, and controlled agent workflows. It is the first version of the claude-fable line in the registry. It has a 1,000,000 token context window and a 128,000 token max output. Pricing starts at $3.00 per million input tokens and $18.50 per million output tokens, with cached input from $0.30 per million tokens. Weights are not open. It supports reasoning mode, tool calling, and accepts image, pdf, and text, returning text.

First version of its line in the registry.

Range across the hosts that serve it: up to $12.00 per 1M input tokens.

• ·1M token context window
• ·128K max output tokens
• ·Supports reasoning and tool calling
• ·Accepts image, pdf, and text inputs
• ·Cached input at $0.30 per million tokens

• Reach for it for creative writing tasks
• Reach for it for analysis of long documents
• Reach for it for controlled agent workflows

35 hosts serve this model at the price above · the maker's documentation

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window size?

The context window is 1,000,000 tokens.

Does it have open weights?

No, the weights are not open.

What input types does it accept?

It accepts image, PDF, and text inputs.