OpenAI Codex: 99.8% of Worker Tokens in 2026
What did OpenAI's Codex study find?
OpenAI's Codex generated 99.8% of output tokens used by its own workers across Codex and ChatGPT as of June 11, 2026, according to a research paper published June 25. The paper is titled "The Shift to Agentic AI: Evidence from Codex." It analyzes usage data across three groups: individual users, organizational users, and OpenAI's own workforce.
Codex is an agentic coding and work platform built by OpenAI. It was originally designed for software development but is now used for tasks including drafting documents, analyzing data, and coordinating communication.
How fast is Codex growing?
Codex now has more than 5 million weekly active users, according to Axios. That is up more than six times since OpenAI launched the desktop app in February. The paper also says Codex usage grew more than fivefold in the first half of 2026.
Despite that growth, the paper notes that agentic tooling remains much less broadly used than ChatGPT overall.
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