OpenAI disclosed that 97.9% of its employees are now using Codex, a sharp rise from about 40% in August 2025. The company shared the figure as part of a broader update on the tool's adoption, highlighting its expansion beyond traditional developers.
For individual users who are not developers, Codex usage has climbed 137x, signaling a shift in how the product is perceived internally and externally. The data points to a widening user base that includes roles outside of engineering, such as product and operations teams.
The precise 97.9% figure comes directly from OpenAI's own tracking, as reported by The Register. The company did not specify the total number of employees, but the near-universal internal use suggests deep integration of the tool into daily workflows.
The leap in non-developer adoption could indicate that Codex is becoming a general-purpose productivity assistant, not just a coding aid. This trend may pressure competitors—such as GitHub Copilot and Amazon CodeWhisperer—to broaden their own user targeting.
Critics may argue that internal adoption at an AI-native company like OpenAI is not representative of the broader enterprise market, where trust and integration hurdles remain higher.