Claude Fable 5.1
Provider：Anthropic
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Key specs
- Context：1M
- Max output：128K
- Tokenizer：Claude
- Released：2026-09-01
Token pricing
- Input price：$10.00 / 1M tokens
- Output price：$50.00 / 1M tokens
- Cache read：$0.250 / 1M tokens
- Cache write：$12.50 / 1M tokens
- Blended price：$20.00 / 1M tokens
Modalities
Text, Image, File
Use Cases
- Deep Reasoning & Analysis：Process long legal docs, academic papers, financial reports; multi-hop reasoning and evidence-chain tracing across huge contexts.（≈ $0.400/call）
- Vision Understanding & Generation：Recognize data trends in charts, OCR scanned docs, analyze photos and produce structured reports.（≈ $0.300/call）
- Content Moderation：Auto-detect violations, hate speech, NSFW content; custom rule sets and score thresholds.
When to pick this model
Signals derived from public pricing and spec fields — not a benchmark. Validate with official docs and your own eval.
- Long context (>=1M tokens): well-suited for long-doc QA, code-base analysis, multi-turn agents.
- Long max output (>=30K tokens): strong fit for deep report / essay / document-drafting workflows.
- Multimodal (text+image): fit for image captioning, OCR, chart QA, vision-grounded reasoning.
- File / PDF input support: fit for document parsing, contract review, RAG over private data.
FAQ
- What is the token pricing of Claude Fable 5.1? Input price $10.00 / 1M tokens, output price $50.00 / 1M tokens, blended about $20.00 / 1M tokens. Refer to Anthropic’s official page for the exact rate.
- What context window does Claude Fable 5.1 support? Context window is 1M, max output about 128K, suitable for long documents, multi-turn chat and complex reasoning.
- What scenarios is Claude Fable 5.1 best for? Based on its capability and pricing, Claude Fable 5.1 fits best: Deep Reasoning & Analysis, Vision Understanding & Generation, Content Moderation. See the Use Cases section for details and cost estimates.
- What input/output modalities does Claude Fable 5.1 support? Supports Text, Image, File modality.
- Is Claude Fable 5.1 a free model? Claude Fable 5.1 is billed per token, not a free model.
- Which provider offers Claude Fable 5.1? Claude Fable 5.1 is offered by Anthropic.
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Full info：Claude Fable 5.1