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Anthropic · Writing, knowledge and maximum quality

Claude Fable 5

A very strong general-purpose model for demanding writing, complex reasoning and working with facts, when higher costs are not the main constraint.

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Costs
Very high · use only where the benefit justifies the cost
Speed
Slow at the most thorough setting
Availability
Online service and apps from Anthropic
Input length
Handles long inputs; the exact limit depends on the service used
Inputs
Text and image inputs

Data checked . Release date unverified.

Indicative capability profile

Where the model is strong

The five levels are our clear summary of the results below. They are not a ranking that applies to every task.

Analysis Very high result in logic and mathematics tasks.
Coding Strong at coding; results also depend on the tool it works in.
Autonomous work across multiple steps Suitable for multi-step work, but more efficient variants exist.
Writing and content Its strongest areas are language, structure and knowledge work.
Speed Maximum quality means a higher price and a longer wait.

Ideal use

When to choose it

  • Long specialist texts and editorial content
  • Tasks combining knowledge, logical reasoning and precise instructions
  • Second review of strategic materials

Usage boundaries

When to choose another model

  • Bulk routine processing
  • Tasks where cost per request is the main criterion

Traceable supporting sources

Data and measurement sources

Distinguish between the manufacturer's documentation and the results of a specific test. Measurements also depend on the settings and the task set used.

LiveBench

LiveBench 2026-06-25

80.8 overall · 90.7 for language

Very good result in language, problem-solving and coding.

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Artificial Analysis

Intelligence Index v4.1

60 points

Performance among the best models; the newer Opus 5 reached a similar level at a lower cost.

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Trends over time

Related events from AI Radar

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Anthropic worth noting update

Anthropic challenges US approach in the Claude Fable 5 and Mythos 5 export control case, responds with jailbreak severity framework

New: Export control issued due to concerns about a jailbreak and the model's cyber capabilities; Anthropic challenged the legality of the export control and the lack of a clear process; Anthropic responded by publishing a jailbreak severity framework

Security researchers and developers now have access to a formal Anthropic program and framework for reporting and assessing the severity of jailbreaks affecting Claude models.

Companies dependent on the Claude Fable 5 or Mythos 5 models face the risk that US export controls could temporarily restrict their access to the model without a clearly defined process, which is relevant for supply chain and geopolitical risk planning.

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