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CATCH #1873 DETECTED OCT 6, 2026 18:27 UTC
THE CATCHscore 9/10
EXHIBIT 1873 · FLASH
Oct 6, 2026 18:27 UTC lmarena lmarena.ai/leaderboard
A new anonymous model, "river-route-29j0", has appeared on the LMArena leaderboard, potentially a stealth release being tested.

READY TO POST:

lmarena just added a new anonymous model, "river-route-29j0", to the leaderboard. could this be a stealth model in testing?

seeing a fresh, unnamed model "river-route-29j0" pop up on lmarena. interesting to see what this 'river route' might be for.

EVIDENCE — the receipts
LMArena: 1 new model appeared on the leaderboard
(labs test unreleased models here — often weeks before launch)

[anonymous codenames — likely stealth] (1)
  + river-route-29j0

caught by the 20-minute sweep · the live wire · all receipts

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