Claude 5 Fable
Claude 5 Fable is a text generation model from Anthropic with a 1,000,000-token context window and built-in reasoning capabilities.
AnthropicLarge-context reasoning with tool and MCP support
Claude 5 Fable is a large language model developed by Anthropic, released in April 2026. It supports a context window of up to one million tokens and can generate responses of up to 128,000 tokens, making it suited for tasks that require processing or producing large volumes of text. The model accepts text and image inputs and exposes configurable effort levels, allowing developers to tune the depth of reasoning applied to a given request.
Claude 5 Fable is designed for agentic and tool-augmented workflows, with native support for external tools and Model Context Protocol (MCP) servers. This makes it a practical choice for building AI agents that need to call APIs, retrieve data, or coordinate across multiple services. Its combination of a large context window, image understanding, and tool integration positions it for complex, multi-step tasks such as document analysis, code assistance, and automated research pipelines.
What Claude 5 Fable supports
Extended Context Window
Processes up to 1,000,000 tokens in a single request, enabling analysis of very long documents, codebases, or conversation histories without truncation.
Reasoning Mode
Supports configurable effort levels that adjust how deeply the model reasons through a problem before responding, useful for complex multi-step tasks.
Tool Use
Accepts structured tool definitions and can call external functions or APIs during a conversation, enabling agentic task completion.
MCP Server Integration
Natively supports Model Context Protocol servers, allowing the model to connect to external data sources and services through a standardized interface.
Image Understanding
Accepts image inputs alongside text, supporting tasks such as document parsing, diagram interpretation, and visual question answering.
Long-Form Output
Can generate responses of up to 128,000 tokens, making it suitable for producing detailed reports, long-form code, or extended structured documents.
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Get Started FreeCommon questions about Claude 5 Fable
What is the context window size for Claude 5 Fable?
Claude 5 Fable supports a context window of 1,000,000 tokens, meaning it can process up to one million tokens of combined input and conversation history in a single request.
What is the maximum response length?
The model can generate responses of up to 128,000 tokens per request.
Does Claude 5 Fable support image inputs?
Yes, Claude 5 Fable accepts image inputs in addition to text, allowing it to analyze visual content such as photos, diagrams, and documents.
What is the pricing for Claude 5 Fable on MindStudio?
Pricing information for Claude 5 Fable has not been publicly listed in the available metadata. Check MindStudio's pricing page or your account dashboard for current rates.
What does the 'effort' input control?
The effort input lets you configure how much reasoning the model applies before generating a response. Higher effort settings direct the model to think through problems more thoroughly, which can improve accuracy on complex tasks.
What is MCP support and how does it work with this model?
MCP stands for Model Context Protocol, a standardized interface for connecting AI models to external data sources and tools. Claude 5 Fable accepts MCP server configurations as an input, enabling it to retrieve information or perform actions through connected services during a conversation.
Documentation & links
Parameters & options
Controls reasoning depth. Higher effort improves quality but uses more tokens and is slower. Recommended: High for most tasks, Extra High or Max for the hardest coding and agentic work, Medium or Low for routine, latency-sensitive tasks.
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