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About

Claude Fable 5.1 is Anthropic’s advanced AI model for coding, knowledge work, research, and long-running agentic tasks. It is designed to improve on Claude Fable 5 with stronger performance across software engineering, scientific research, multidisciplinary reasoning, computer use, business workflows, and complex problem solving. The model can handle extended multi-step work, verify its own results, diagnose difficult software issues, and operate effectively across tool-heavy workflows. Anthropic also reduced cache-read pricing for Fable 5.1, lowering typical usage costs compared with Fable 5 and creating larger savings for highly agentic workloads. Fable 5.1 includes updated safeguards intended to reduce false positives while allowing more legitimate cybersecurity tasks such as vulnerability discovery for defensive purposes. The model is available through Claude products, the Claude API, Amazon Web Services, Google Cloud, and Microsoft Azure.

About

Join world-class digital teams in building inclusive products with Fable. Skip recruitment and quickly collect feedback from assistive technology users. Collect and action insights through a central hub. Courses tailored to your team’s unique roles, tech stacks, and design systems. Learn from, not just about, people with disabilities. Track course completion and skill development across your teams. Drive compliance by working with people with disabilities. Measure the usability of your digital experiences with our free Accessible Usability Scale (AUS). Fable’s enterprise-grade security standards are trusted by leading organizations. ISO 27001 and SOC 2 certified. You need to ensure your products are compliant and usable while scaling accessibility across your organization. You need to skip the recruitment headaches and start usability testing and research with assistive technology users.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Software developers, researchers, enterprises, analysts, knowledge workers, and AI application teams that need advanced coding, reasoning, research, and long-running agentic capabilities

Audience

Companies seeking a tool to drive compliance by working with people with disabilities

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

$10 per 1M tokens (input)
$10 per million input tokens and $50 per million output tokens
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • This feels like the model you reach for when the work is genuinely difficult. Not every task needs Fable, but for complex coding, long-horizon agents, deep research, and big messy knowledge-work projects, Fable 5.1 looks built for the hard stuff. The 1M-token context window is a huge advantage. For developers and AI power users, that means you can work across large repos, long docs, research sets, transcripts, spreadsheets, and project history without constantly chopping everything into pieces. I also like that Anthropic specifically calls out document, spreadsheet, and slide work. That makes it feel useful beyond coding alone — more like a high-end model for serious professional workflows.

Cons

  • The downside is price and complexity. Anthropic says most workloads should start with Claude Opus 5, and Fable 5.1 is better reserved for demanding reasoning or cases where Opus 5 still falls short.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Company Information

Fable
Founded: 2018
Canada
makeitfable.com

Alternatives

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Claude Fable 5

Claude Fable 5

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UsableNet AQA

Usablenet
Claude Opus 5

Claude Opus 5

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AudioEye

AudioEye

AudioEye, Inc.

Categories

Categories

Integrations

React
AiAssistWorks
Bind AI
Buda
C++
Claude Cowork
Claude Science
Devin Desktop
GitAuto
GitHub
GitHub Copilot
Java
Microsoft Foundry
MyClaw
OpenClaw.Direct
Snowflake Cortex AI
Springhub
Use AI
Visual Studio Code
XML

Integrations

React
AiAssistWorks
Bind AI
Buda
C++
Claude Cowork
Claude Science
Devin Desktop
GitAuto
GitHub
GitHub Copilot
Java
Microsoft Foundry
MyClaw
OpenClaw.Direct
Snowflake Cortex AI
Springhub
Use AI
Visual Studio Code
XML
Claim Claude Fable 5.1 and update features and information
Claim Claude Fable 5.1 and update features and information
Claim Fable and update features and information
Claim Fable and update features and information