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Claude Mythos 5

Anthropic · Jun 9, 2026

Restricted Claude model for advanced cybersecurity and biology research workflows

BENCHMARKS

Not in the Epoch Capabilities Index. Epoch benchmarks what it can run, so this is a gap in coverage, not a poor result.

From the lab

Launch announcement · Jun 9, 2026Released Claude Fable 5 and Claude Mythos 5
RELEASE DATEJun 9, 2026
WEIGHTSClosed weights
CONTEXT WINDOW1M
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image, pdf
OUTPUTStext
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Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.