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CATCH #1163 DETECTED SEP 3, 2026 19:16 UTC
THE CATCHscore 9/10
EXHIBIT 1163 · FLASH
Sep 3, 2026 19:16 UTC lmarena lmarena.ai/leaderboard
A new, anonymously named model 'muse-spark-1.3-xhigh-webdev' has appeared on the LMArena leaderboard, suggesting a stealth model currently in testing.

READY TO POST:

looks like lmarena has a new unannounced model on their leaderboard: muse-spark-1.3-xhigh-webdev. wonder whose it is and what 'xhigh-webdev' means.

a new anonymous model just popped up on lmarena, codenamed muse-spark-1.3-xhigh-webdev. could be a stealth dev model in the works.

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)
  + muse-spark-1.3-xhigh-webdev

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