Claude Fable 5.1 is Anthropic's Mythos-level model for long-running coding, agentic, and knowledge work.
Product information
Information below comes from the product website or public documentation. Pricing and availability may change.
- Category
- AI Agents
- Maturityi
- Available
- Deploymenti
- Cloud / SaaS
- Buying / access
- Buy or sign up directly
- Source
- Official websiteChecked Sep 20, 2026
Reality check
A demo shows what may be possible. These points help judge whether the product fits day-to-day use.
- Knowledge lookup, drafting and multi-step workflows with review
- Tasks with clear tools, permissions and success criteria
- Teams that can evaluate outputs with real examples
- Prompt/version history, traces, evaluations and cost
- Data retention, model providers and tool permissions
- Human approval for irreversible or sensitive actions
- An unsupervised decision-maker for high-stakes work
- A replacement for an unclear business process
- A guarantee that a larger model removes all errors
About
Claude Fable 5.1 is Anthropic's Mythos-level model, built for ambitious, long-running projects. It handles agentic tasks that span many applications, ambitious coding work across entire codebases, multi-stage enterprise knowledge work, and vision tasks such as reading diagrams, charts, and tables in files and PDFs. It is available to Pro, Max, Team, and Enterprise users and on the Claude Platform, AWS, Google Cloud, and Microsoft Foundry, priced at $10 per million input tokens and $50 per million output tokens.
Tags
Scenes
Product details
- Manufacturer / team
- Anthropic
- Product typei
- Service
- Price note
- $10 per million input tokens and $50 per million output tokens; US-only inference at 1.1x pricing
The cost iceberg
The purchase price is only one part of an automation project.
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