Claude Fable 5.1 Free Desktop

Claude Fable 5.1 is a free Anthropic client: 1M context, no Pro, no API key for the app. claude ai long window for repos and papers. vs claude opus and Mythos 5.1 - this one is the long pass.

What's new in v1.8 (September 27, 2026)

• Default model 5.1
• 1M meter + session search
• Sonnet 5 fallback when busy
• Prompt library refresh
• claude opus compare strip

Key Features

• 1M token context
• Status light for endpoint health
• Prompt library
• Windows 10/11 x64 zip
• Session search

Getting Started

1. Download v1.8.
2. Extract and run.
3. Finish the wizard.
4. Drop a whole repo in the 1M window.
5. Notes in files/notes/.

FAQ

Is it free? Yes. MIT client, no subscription.

vs claude opus? Opus for hardest reasoning. This client when you need 1M tokens.

vs Mythos 5.1? Mythos leans multimodal. This one is the long-context text/code pass.

Requirements

Windows 10/11 x64. Internet.

License

MIT notes - Copyright (C) 2026 claudefable51desk