What is flow-state image generator on LmArena and is it created by Anthropic?

Flow-state-2 and flow-state-3 are mystery image generation models appearing on LMArena's blind evaluation leaderboard, with community speculation pointing to Anthropic as the developer given naming conventions and submission patterns. No architecture details, parameter counts, or benchmark scores have been officially disclosed. Practitioners should monitor LMArena voting data closely, as blind arena rankings often surface genuine capability signals before formal announcements. Until Anthropic or another lab confirms authorship, treat all attribution as unverified.