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
Krater rank
#66
Is Claude down?
Claude slow or throwing errors? The live Claude status page shows Anthropic incidents and which Krater models to use meanwhile.
Live Claude statusCapabilities
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
57.9
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 Haiku 4.5 (batch)
Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models.
Open comparisonClaude Fable 5.1 vs Claude Opus 4.1
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks.
Open comparisonClaude Fable 5.1 vs Claude Opus 5 (batch)
Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.
Open comparisonFAQ
Questions about Claude Fable 5.1
Clear answers based on the model catalog and Krater access.
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