CATCH #1343
DETECTED SEP 13, 2026 22:18 UTC
THE CATCHscore 9/10
EXHIBIT 1343 · FLASH
Sep 13, 2026 22:18 UTC
lmarena
lmarena.ai/leaderboard
13 new models, including several anonymous 'muse-spark' and 'teffa-alpha' variants, appeared on the LMArena leaderboard, potentially signaling unannounced models, alongside new named versions of Claude, GLM, GPT, and Grok.
READY TO POST:
lmarena just added 13 new models to their leaderboard, with some intriguing 'muse-spark' and 'teffa-alpha' codenames. could these be unreleased stealth models?
big drop on lmarena: seeing new claude-fable, gpt-6-astra, and grok-4.6 versions, plus some completely anonymous models like muse-spark. labs are busy!
EVIDENCE — the receipts
LMArena: 13 new models appeared on the leaderboard
(labs test unreleased models here — often weeks before launch)
[anonymous codenames — likely stealth] (4)
+ muse-spark-1-3-max-bhma-document
+ muse-spark-1-3-max-bhma-image-to-webdev
+ muse-spark-1-3-max-bhma-vision
+ teffa-alpha-6pjf
[named / preview] (9)
+ claude-fable-5.1-max-document
+ claude-fable-5.1-max-image-to-webdev
+ claude-fable-5.1-max-vision
+ glm-5.3-flash-image-to-webdev
+ gpt-6-astra-max-document
+ gpt-6-astra-max-vision
+ grok-4.6-high-public-document
+ grok-4.6-high-public-image-to-webdev
+ grok-4.6-high-public-vision
caught by the 20-minute sweep ·
the live wire · all receipts