Claude Fable 5.1 AI Evaluation | LayerLens - Benchmark Results & Performance

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Claude Fable 5.1 AI Evaluation | LayerLens - Benchmark Results & Performance

Model

Claude Fable 5.1 by Anthropic

Text+image+file->text

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Claude Fable 5.1 is Anthropic's most capable frontier model, delivering significant improvements over Claude Fable 5 in agentic coding, long-running workflows, and knowledge work. It excels at complex, multi-day autonomous tasks such as large-scale code refactors, scientific research, and enterprise workflows, with improved judgment on ambiguous problems and fewer confident wrong answers. Fable 5.1 features enhanced safeguards with fewer false positives, reduced cache-read pricing for cost savings on agentic workloads, and early research capabilities that offer a glimpse of how AI will contribute to scientific progress. It is generally available, while its counterpart Claude Mythos 5.1 (the same underlying model with different safeguard levels) is available only through trusted access programs.

Evaluations

No evaluations run yet

Latency

—

Context length

tokens

Cost

$10 · $50

input · output per 1M tokens

Key takeaways

Claude Fable 5.1 is Anthropic's most capable frontier model, designed for complex, multi-day autonomous tasks like large-scale code refactors, scientific research, and enterprise workflows.
The model excels in agentic coding, long-running workflows, and knowledge work, demonstrating improved judgment on ambiguous problems and fewer confident wrong answers.
It features enhanced safeguards with fewer false positives and reduced cache-read pricing for cost savings on agentic workloads.
Claude Fable 5.1 is a 'text+image+file->text' modality model, featuring a MoE (Mixture of Experts) architecture and a substantial context length of 1,000,000 tokens.
It is a proprietary model, generally available, and showcases early research capabilities hinting at its potential contribution to scientific progress.

Technical specifications

Context length: 1M tokens
Max output: —
Architecture: MoE
Modalities: text+image+file->text
Parameters: ~4000B
Open weights: No
Licence: Proprietary
Regions: USA
Vendor: Anthropic
Provider model key: anthropic/claude-fable-5.1