A model slug labeled "claude-mythos-5" briefly surfaced in the model registry of Anthropic's internal developer tool "Dev Mode" around June 6, 2026, before being removed within minutes to tens of minutes. It is not an official announcement and appears to be an internal test or staging entry, but as a new generation of "Mythos"—the company's independent top-tier model class—it has drawn major attention among developers (details).
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