OpenAI Spotted Testing New Model Codenames Zinc and Magnesium

Rumors suggest a new GPT-5.6.1 release is approaching, as new codenames, Zinc and Magnesium, have reportedly appeared in OpenAI's DesignArena, though they are not yet active.

2026-07-28 ~ 2026-07-29 · 2 related posts

• DesignArena leak points to two new GPT codenames, Zinc and Magnesium — TheZachMueller · 2026-07-28
• Rumor says GPT-5.6.1 is incoming as OpenAI tests Zinc and Magnesium — brandon_galang · 2026-07-29