Claude Fable 5.1 improves on Fable 5 across agentic coding, long-running workflows, front-end and visual code generation, finance, analysis, and knowledge work, with more concise plans and summaries. Anthropic retains prompts and outputs for 30 days; Zero Data Retention is not available.
Added Sep 1, 2026
Context Window
1.0M
Max Output
128.0K
Input Price (Auto)
$10.00/1M
Output Price (Auto)
$50.00/1M
Cache Read (Auto)
$0.25/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
65.7
Coding Index
81.6
Agentic Index
61.3
Reasoning
GPQA Diamond
Graduate-level scientific reasoning
93.7%
Better than 98% of models compared
HLE
Humanity's Last Exam
59.1%
Better than 99% of models compared
AA-LCR
Long context reasoning evaluation
80.0%
Better than 98% of models compared
GDPval-AA
Economically valuable tasks
67.7%
CritPt
Research-level physics reasoning
29.7%
Coding
SciCode
Python programming for scientific computing
62.0%
Better than 99% of models compared
Knowledge
AA-Omniscience Accuracy
Proportion of correctly answered questions
67.2%
AA-Omniscience Hallucination Rate
Rate of incorrect answers among non-correct responses
72.6%
Last updated Sep 2, 2026, 12:00 AM
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