Audience

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

About Claude Fable 5.1

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.

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Pricing

Starting Price:
$10 per 1M tokens (input)
Pricing Details:
$10 per million input tokens and $50 per million output tokens

Integrations

API:
Yes, Claude Fable 5.1 offers API access
See Integrations

Ratings/Reviews - 1 User Review

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
More Reviews for Claude Fable 5.1 Write a Review

Company Information

Anthropic
Founded: 2021
United States
claude.ai

Videos and Screen Captures

Claude Fable 5.1 Screenshot 1
Claude Fable 5.1 Screenshot 1
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Product Details

Platforms Supported
Cloud
Training
Documentation
Support
Online

Claude Fable 5.1 Frequently Asked Questions

Q: What kinds of users and organization types does Claude Fable 5.1 work with?
Claude Fable 5.1 works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Claude Fable 5.1 support in their product?
Claude Fable 5.1 supports these languages: English.
Q: What kind of support options does Claude Fable 5.1 offer?
Claude Fable 5.1 offers support via online.
Q: What other applications or services does Claude Fable 5.1 integrate with?
Claude Fable 5.1 integrates with: AgentSea, Vercel AI Gateway, AiAssistWorks, Aider, Amazon Bedrock, Amp, Anything, App0, Augment Code, Microsoft Foundry, Bash, Biela.dev, Bind AI, BLACKBOX AI, Bolt.new, ClickUp Brain, Brokk, Buda, Shipper.now, C, C++, C#, Charlie, Cheaper Inference, and Cherry Studio and more.
Q: Does Claude Fable 5.1 have an API?
Yes, Claude Fable 5.1 has an API.
Q: What type of training does Claude Fable 5.1 provide?
Claude Fable 5.1 provides training in the form of documentation.
Q: How much does Claude Fable 5.1 cost?
Pricing for Claude Fable 5.1 starts at $10 per 1M tokens (input).

Claude Fable 5.1 Product Features

Claude Fable 5.1 Verified User Reviews

Write a Review
  • A Claude Fable 5.1 User
    Developer
    Used the software for: Less than 6 months
    Frequency of Use: Daily
    User Role: User
    Company Size: 100 - 499
    Ease 5 out of 5 stars
    Features 5 out of 5 stars
    Pricing 4 out of 5 stars
    Probability You Would Recommend? 9 out of 10

    "Fable 5.1 is WILD!"

    5 out of 5 stars Posted 2026-09-01

    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.

    Overall: Overall, Claude Fable 5.1 is the strongest model for long-context, high-effort, agentic work. It is not the everyday cheap option, but when the task is big, complicated, and important, this is exactly the kind of model I would want available.

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