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Claude Fable 5.1

claude-fable-5.1
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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... Built by Anthropic.

Prices updated

Input price

$10

per 1M tokens · Standard

Output price

$50

per 1M tokens · Standard

Input limit

1M

tokens

Output limit

128K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF
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Claude Fable 5.1 price history

2 price records since 9/25/2026

Claude Fable 5.1 cost calculator

Input20M tokens
Output5M tokens

$450/month

Standard pricing

    Overview

    What is Claude Fable 5.1?

    Claude Fable 5.1 is a text & reasoning and vision model from 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... Its 1M context window and $10 input price make it a candidate for quality-focused production applications.

    Image understandingDocument analysisContent workflowsClassification

    Benchmarks

    Claude Fable 5.1 benchmarks & speed

    How Claude Fable 5.1 scores on standardized evaluations, and where it lands among every model we track.

    53.4

    Intelligence Index

    Better than 99% of 153 models

    61tok/s

    Output speed

    Better than 25% of 119 models

    1340

    DesignArena Elo

    Better than 95% of 81 models

    Reasoning

    GPQA Diamond

    93.7%

    Graduate-level scientific reasoning · top 4%

    HLE

    59.1%

    Humanity's Last Exam · top 1%

    Coding

    SciCode

    63.1%

    Python for scientific computing · top 1%

    Latency & design

    Time to first token
    259.12s
    DesignArena win rate
    59.3%
    Design battles judged
    9,341

    Independent scores from Artificial Analysis and DesignArena · updated 10/8/2026. Higher is better; ranks compare against every model we track with that score.

    Rates

    Claude Fable 5.1 pricing

    Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

    Input · Standard

    $10

    Per 1M tokens

    Cached input · Standard

    $0.25

    Per 1M tokens

    Capabilities

    Claude Fable 5.1 Tools

    Tools available when using Claude Fable 5.1 through supported provider APIs.

    Function calling

    Supported

    Structured outputs

    Supported

    JSON mode

    Supported

    Reasoning

    Supported

    Built-in web search

    Not supported

    Log probabilities

    Not supported

    Deterministic seed

    Not supported

    Parallel tool calls

    Not supported

    Prompt caching

    Supported

    Strengths and limitations

    Strengths

    • Measured results (AA Intelligence 53.4 · DesignArena Elo 1340) position it for demanding production work.
    • 1M context supports large documents, repositories and extended conversations.
    • Supports text & reasoning and vision workloads in one model.

    Limitations

    • Generated tokens cost 5× more than input tokens, which matters for verbose responses.
    • Large context capacity does not guarantee consistent retrieval across the entire prompt.
    • Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

    Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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    Frequently asked questions about Claude Fable 5.1

    Claude Fable 5.1 is a text & reasoning and vision model from 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...