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OpenAI says 97.9% of its employees are now using Codex, up from ~40%

OpenAI says 97.9% of its employees are now using Codex, up from ~40% in August 2025; non-developer usage of Codex has risen 137x for individual users

Codex, it's not just for developers, really — A company can learn a lot about the market by looking at its own employees.

Source: The Register · Opens in new tab