Claude Fable 5.1on Krater.ai
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
Released September 1, 2026
Specifications
Claude Fable 5.1 at a glance
Context
1M tokens
Max output
128K tokens
Input
Text, Image, File
Output
Text
Input price
$10.00 / 1M
Output price
$50.00 / 1M
Capabilities
What it is good at
Catalog capabilities
- Accepts image input
- Generates text responses
- Supports tool calling
- Supports structured outputs
Good for
Benchmarks
Catalog data, not Krater benchmarks.
Coding index score
81.6
Agentic index score
58
Intelligence index score
53.4
Design Arena fullstack rank
#1
Design Arena python-pptxslides rank
#1
Compare
Compare Claude Fable 5.1
Claude Fable 5.1 vs Claude Opus 4.5 (batch)
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
Open comparisonClaude Fable 5.1 vs Claude Opus 4.7 (Fast)
Fast-mode variant of Opus 4.7 - identical capabilities with higher output speed at premium 6x pricing. Learn more in Anthropic's docs:
Open comparisonClaude Fable 5.1 vs Claude Sonnet 5 (batch)
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work.
Open comparisonFAQ
Questions about Claude Fable 5.1
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