Claude Fable 5
Claude model for creative writing, analysis, and controlled agent workflows
ECI STANDING#3 of 266
SCORE163.27160.54–167.1 CI
FRONTIER LAGLaunched in the leadNothing released before it had scored higher.
SCORES LIKE THESE MODELSClaude Fable 5.1Anthropic · Sep 2026164.47Claude Opus 5Anthropic · Jul 2026162.3GPT-5.5 ProOpenAI · Apr 2026162.25GPT-5.6 SolOpenAI · Jul 2026161.81
Full Epoch Capabilities Index ranking ↗From the lab
Launch announcement · Jun 9, 2026Released Claude Fable 5 and Claude Mythos 5RELEASE DATEJun 9, 2026
WEIGHTSClosed weights
CONTEXT WINDOW1M
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image, pdf
OUTPUTStext
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