Claude Fable 5.1 (batch)

Anthropic · Released September 2026

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...

It belongs to Anthropic's Claude family: Opus is the deep-capability tier, Sonnet balances quality and speed, Haiku is the light tier, and Fast servings trade some depth for latency.

Facts and pricing

Provider

Anthropic

Context window

1M tokens

Input price

55.0 credits / 1M tokens ($5.00 raw)

Output price

275 credits / 1M tokens ($25.00 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

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What Claude Fable 5.1 (batch) is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like Claude Fable 5.1 (batch):

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

Anthropic family

All 27 Anthropic models

Frequently asked questions

What is Claude Fable 5.1 (batch)?

Claude Fable 5.1 (batch) is an AI model by 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...

How much does Claude Fable 5.1 (batch) cost on Zeplik?

Input tokens cost 55.0 credits per million and output tokens 275 credits per million (1 credit = $0.10; the raw provider rates are $5.00 and $25.00 per million). New accounts start with free credits.

How long can a conversation with Claude Fable 5.1 (batch) be?

Claude Fable 5.1 (batch) has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.

Does Claude Fable 5.1 (batch) support images and tools?

Claude Fable 5.1 (batch) accepts image input and supports tool calling.

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