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Claude Fable 5.1

Extended Thinking & Agentic Pipeline
Official Source & Paper
Anthropic logo Anthropic 📄 Proprietary API 🌍 United States (US) 🗓️ Effective Date: 15.09.2026

Upgraded Fable release featuring dynamic compute scaling during inference, near-zero hallucination rates, and direct headless browser automation.

Model Size / Parameters Proprietary Frontier Architecture: Extended Thinking & Agentic Pipeline
Context Window (Input) 500k tokens Token Capacity
Max Output Tokens 64k tokens Single Generation Limit
Supported Modalities Text, Code, Vision Native Multimodal Ingestion
License & Access Proprietary API Open Weights vs. API
Release Date September 2026 Effective Date: 15.09.2026

Verified Benchmark Results

Standardized academic and industry evaluation benchmarks (Effective Date: 15.09.2026).

MMLU-Pro / 5-Shot General Intellect
93.4%
SWE-bench Verified Software Engineering
70.1%
MATH 500 / AIME Mathematical Reasoning
96.0%
GPQA Diamond Doctoral Science
79.5%
HumanEval / Python Algorithm Synthesis
95.0%

Pricing & Cost Efficiency

Official API token pricing and self-hosted licensing terms.

Input Pricing (Prompt)
$3.25 / 1M tokens
Per 1 million processed tokens
Output Pricing (Generation)
$16.00 / 1M tokens
Per 1 million generated tokens
Verified Datasheet: Source: Anthropic Research Documentation • Effective Date: 15.09.2026
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