Alleged OpenAI codenames Zinc and Magnesium surface in Design Arena

OpenAI's public GPT-5.6 materials identify only Sol, Terra and Luna, leaving the disabled entries unconfirmed.

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Primary source: X - @Lentils80

Why it matters

If authentic, the entries suggest OpenAI may update models inside its Sol and Terra tiers without waiting for a new GPT generation, accelerating the post-launch model cycle.

Illustration of alleged OpenAI project codenames Zinc and Magnesium presented next to the listed GPT-5.6 names Sol, Terra and Luna.

Two disabled model entries labeled "Zinc" and "Magnesium" appeared in Design Arena on July 28th, according to model watcher Lentils (@Lentils80), raising the possibility that OpenAI is already testing revisions to its GPT-5.6 family.…

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