Claude Fable 5.1
Claude Fable 5.1 is Anthropic's agentic powerhouse — improved across the board over Fable 5 with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work. Live on Hoodgen AI.
Technical Specifications
Live data fetched from the OpenRouter model registry — always up to date.
What is Claude Fable 5.1?
Claude Fable 5.1 is Anthropic's agentic flagship model, designed for long-horizon agentic workflows, coding, and complex multi-step reasoning. It accepts text, image, file, audio, and video inputs — one of the most versatile models available. With a 1M token context window, it can process long documents and complex multimodal data in a single session.
Features & Capabilities
Agentic Coding
Long refactors and front-end work executed reliably.
Long Workflows
Sustained multi-step tasks without losing context.
Visual Changes
Front-end and visual edits handled with precision.
Knowledge Work
Research and analysis across long document sets.
Multimodal Input
Text, image, and file inputs supported.
1M Context
Whole repositories in a single working session.
Who Is Claude Fable 5.1 For?
Long Code Refactors
Repository-scale changes executed end to end.
Agent Pipelines
Autonomous agents that run long multi-step tasks.
Frontend & Visual Work
UI changes and visual polish with fewer handoffs.
Deep Knowledge Work
Analysis and synthesis over large document corpora.
Claude Fable 5.1 Pricing
- Unlimited chats on free plan credits
- No credit card required
- Included in Hoodgen AI free tier (100 credits/mo)
- Premium models also available on paid plans
What Makes Claude Fable 5.1 Different?
Claude Fable 5.1's biggest gains over Fable 5 are exactly where agents struggle most: agentic coding, long-running workflows, and knowledge work. Anthropic targeted the failure modes that break autonomous agents — losing thread, drifting off-task, and over-editing — rather than just pushing benchmark numbers.
It also strengthens front-end and visual work, a category that combines code generation with design judgment. Combined with a 1M context window and 128K max output, the model can hold a full codebase, track its own progress, and deliver coherent multi-file changes.
On OpenRouter, Claude Fable 5.1 is priced at $10 per million input tokens and $50 per million output tokens — premium pricing for a model positioned at the top of Anthropic's agentic line.
Claude Fable 5.1 Performance
Claude Fable 5.1 improves on Fable 5 across the board — with the biggest gains in agentic coding, long-running workflows, and knowledge work.
What Can You Do With Claude Fable 5.1?
Claude Fable 5.1 is built for speed across every modality. Build agents that see, hear, and read; analyze media; generate code; and process long documents — all with fast responses and a 1M context window that fits large inputs in one session.
Best Use Cases
- Fast agentic workflows
- Multimodal content analysis
- Code generation and review
- Long-document processing
- Real-time reasoning applications
Claude Fable 5.1 Privacy & Data Policy
Claude Fable 5.1 is developed by Anthropic and hosted on OpenRouter. Prompts and completions are processed by Anthropic's API. As with any third-party model, avoid sharing sensitive personal data.
Because Claude Fable 5.1 is a third-party hosted model, avoid pasting passwords, personal data, or proprietary source code you would not share with any external provider. Hoodgen AI always keeps free alternative models available so you can switch without interruption.
Claude Fable 5.1 vs Other Models
Frequently Asked Questions
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