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Anthropic
Claude Fable 5.1
Flagship Claude: code, long tasks, reasoning
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See available modelsAbout the model
Claude Fable 5.1 is the flagship model of Anthropic's Claude line, built for the most demanding development tasks and agent scenarios. It lays out deep step-by-step reasoning, follows instructions and system prompts with discipline, and is careful with the details of its output. The model understands images, including screenshots, diagrams and mockups, and holds a context of up to a million tokens, so an entire codebase or a large document fits into a single request. It calls tools reliably (function-calling) and carries out multi-step actions, which makes it suited to autonomous agents. It handles Russian confidently.
Strengths
- Deep reasoning on complex tasks
- Strong work with code and refactoring
- Understands images, diagrams and screenshots
- Context up to 1M tokens
- Reliable tool calling for agents
- Works well with Russian
Where to use it
- Code development, review and refactoring
- Autonomous agents with long chains of steps
- Analyzing large documentation and specifications
- Fine-grained analytics and planning
- Analyzing screenshots and diagrams