New GPT Models Zinc & Magnesium Spotted – Likely Response to Claude Opus 5

Zinc and Magnesium models have appeared in DesignArena, likely updates to GPT-5.6 Sol and Terra. They are currently disabled and may launch this week or next week as OpenAI's answer to Claude Opus 5.

• OpenAI
• GPT
• model update
• Claude Opus 5