Claude Fable 5 Overview
Claude Fable 5 for Ambitious, Long-Running Work
Claude Fable 5 is Anthropic's most capable generally available model, built for ambitious coding and knowledge work that can run for days. It plans across stages, uses tools, delegates, tests its own work, and returns review-ready results.
Try Claude Fable 5Three Defining Capabilities
Sustain long-horizon work
Stay focused across extended, asynchronous projects that previous models could not sustain.
Plan, delegate, and execute
Coordinate stages, tools, and subagents while keeping the final objective in view.
Test and refine its own work
Check assumptions, run tests, inspect outputs, and improve results before review.
Built for Work That Takes Days, Not Prompts
Claude Fable 5 can plan, execute, inspect, test, and refine complex work with minimal oversight.
Large-scale implementation
Build substantial features while preserving architecture, behavior, and project conventions.
Persistent root-cause debugging
Trace difficult failures across systems, test hypotheses, and fix the underlying cause.
Migrations and modernization
Move large codebases forward while tracking dependencies, tests, and behavior.
Self-verifying delivery
Write tests, inspect outputs, and catch issues before handing completed work back.
Tool-rich execution
Work across browsers, terminals, files, and APIs without losing the objective.
Subagent coordination
Delegate focused work across stages, then integrate and verify the combined result.
Where Claude Fable 5 Delivers the Most Value
Ambitious software engineering
Deliver large implementations, migrations, debugging, and multi-day coding projects.
Autonomous agents
Run multi-stage agents that plan, delegate, use tools, and validate their own work.
Enterprise workflows
Turn complex, multi-stage knowledge work into deliverables ready for team review.
Deep research and analysis
Synthesize extensive sources, test assumptions, and produce evidence-based reports.
Document intelligence
Interpret charts, tables, diagrams, contracts, and dense PDFs with visual context.
Review-ready deliverables
Create and revise plans, spreadsheets, presentations, and enterprise documents.
Claude Fable 5 Technical Specifications
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Claude Fable 5 FAQ
Claude Fable 5 is Anthropic's most capable generally available model for ambitious, long-running coding and knowledge work.
Use it for multi-day agents, large coding projects, deep research, enterprise workflows, vision-heavy analysis, and complex deliverables.
It supports a 1M-token context window and up to 128K output tokens.
It is designed with stricter safeguards for sensitive and high-risk requests while keeping ordinary productivity work practical.
API pricing is $10 per million input tokens and $50 per million output tokens. US-only inference is available at 1.1x pricing.
Ready to hand off ambitious work to Claude Fable 5?
Bring long-running agents, ambitious coding, deep research, and review-ready workflows into one organized Pixmax workspace.