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What is Claude Fable 5.1?

Claude Fable 5.1 is an advanced general-purpose AI model from Anthropic focused on coding, scientific research, knowledge work, business processes, and long-horizon agentic reasoning. It is the generally available counterpart to Claude Mythos 5.1, which uses the same underlying model but is offered with different safeguards for vetted cybersecurity and life sciences users. Compared with Claude Fable 5, Fable 5.1 shows stronger performance across agentic coding, research, computer use, multidisciplinary reasoning, business workflow automation, and other complex benchmarks. The model is designed to remain effective during long-running tasks that involve planning, tool use, repeated verification, code modification, research, and multi-step decision making. In software engineering scenarios, it can investigate difficult bugs, trace problems across large codebases, perform code review, and work through complex implementation tasks with less supervision. Anthropic also positions Fable 5.1 as a stronger research model, with demonstrated capabilities in scientific analysis, computational modeling, and other technically demanding workflows. Improvements to cache-read pricing reduce the cost of reusing previously processed context, making the model more economical for workflows that involve long conversations, large codebases, or repeated tool calls. Fable 5.1 introduces updated enterprise privacy and security options, including Enterprise Frontier Safeguards and zero-data-retention access for eligible customers during the rollout period. Its cybersecurity protections are designed to permit more benign defensive security work, including vulnerability discovery, while continuing to restrict higher-risk activities such as exploit development and certain penetration-testing tasks. The model is available through Claude.ai, Claude Code, Claude Cowork, the Claude API, Amazon Web Services, Google Cloud, and Microsoft Azure under the claude-fable-5-1 model identifier for API users.

What is Claude Haiku 3?

Claude Haiku 3 distinguishes itself as the fastest and most economical model in its intelligence class. It features state-of-the-art visual capabilities and performs exceptionally well in multiple industry evaluations, rendering it a versatile option for a wide array of business uses. Presently, users can access the model via the Claude API and at claude.ai, which is offered to Claude Pro subscribers, along with Sonnet and Opus. This innovation significantly expands the resources available to businesses aiming to harness the power of advanced AI technologies. As companies seek to improve their operational efficiency, such solutions become invaluable assets in driving progress.

Media

Media

Integrations Supported

AiAssistWorks
Amp
Anything
Claude
Claude Max
Claude Pro
Model Context Protocol (MCP)
StackAI
Cherry Studio
Cosmos
Dessix
Higgsfield Supercomputer
Node.js
PowerShell
Scala
TypeScript
WebStorm
YAML

Integrations Supported

AiAssistWorks
Amp
Anything
Claude
Claude Max
Claude Pro
Model Context Protocol (MCP)
StackAI
Tessl
VeedoAI

API Availability

Has API

API Availability

Has API

Pricing Information

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

Pricing Information

Pricing not provided

Supported Platforms

SaaS

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

anthropic.com

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal Models

Not specified

Categories and Features

AI Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

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