Models · Anthropic

Claude Fable 5

flagship Closed 2026-06-09

Lab: Anthropic
Released: 2026-06-09
Parameters: unknown
Context window: 1M
Input: text, image
Output: text
Weights: Closed
Official page: platform.claude.com ↗

Benchmark scores

HarmBench safety 6.1%

6.1% 2026-06-17 Red-Team Study Finds Frontier LLMs Remain Vulnerable to Automated Attacks
6.1% 2026-06-17 Red-Team Study Finds Frontier LLMs Remain Vulnerable to Adaptive Attacks

Humanity's Last Exam reasoning 53%

53% 2026-06-09 Claude Fable 5 launches at #1 on the Artificial Analysis Intelligence Index

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