New Gemini 4 Pro checkpoint "barium-b" appears on Arena

Md Ismail Šojal 🕷️ @0x0SojalSecOriginally posted 2026.09.27

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New Gemini 4 Pro drop, - checkpoint just appeared in Arena. - Codename: barium-b - The 3D F1 studio output is a noticeable jump in detail, materials, and UI coherence. The quality jump in 3D + UI work is hard to ignore https://x.com/thtbee_/status/2103494401683321192/video/1

This post quotes another post: “Gemini 4 leak roundup: in post-training, aimed at Astra and Opus 5.5”