Claude Fable 5

claude-fable-5

Anthropic's most capable publicly-available model. Designed for ambitious long-running agentic tasks — software engineering, scientific research, and complex knowledge work. Features mandatory adaptive thinking, 1M token context window, 128K output capacity, and all effort levels including xhigh and max. Priced at $10/$50 per million tokens.

Use this model with Aisle

Chat

Have natural conversations with the model in a familiar interface

Prompts

Automate tasks, share with your team, and deploy to chat

Playgrounds

Test prompt variants, model settings, and compare models side by side

Workflows

Chain prompts together for complex automation and outcomes

Context Window

1000K

tokens

Max Output

128,000

tokens

Extended Thinking

Supported

Web Search

Available

MCP Support

Available

Structured Output

Available

Supported File Formats

Images

WEBP(5 MB)PNG(5 MB)JPEG(5 MB)GIF(5 MB)

Documents

pdftextdocxlsrtfdocxxlsxpptxpptodtodpods

Data Retention Policy: Anthropic classifies Claude Fable 5 as a "Covered Model" subject to a minimum 30-day data retention policy. Zero Data Retention (ZDR) is not available for this model. Data is automatically deleted after 30 days. Anthropic Privacy Policy