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OpenAI Says Codex Generates 99.8% of Its Internal AI Output

June 25, 2026 at 13:52 EDT

AI Agents
Software Dev & Coding
Foundation Models

On June 25, OpenAI said in its official blog post "How agents are transforming work" that 99.8% of the AI output tokens generated inside the company now come from Codex, its agentic coding and work platform. Only 0.2% flows through ChatGPT, a figure the company presents as evidence of a shift from one-off conversational use toward agents that autonomously carry tasks to completion. Details

June 25, 2026 · OpenAI Economic Research

From chat to command: agents now do almost all the work inside OpenAI

In a first-party study, OpenAI reports that 99.8% of its weekly AI output tokens now come from its agent platform Codex — leaving ChatGPT at just 0.2%. The shift: away from short, repeated chats toward long-horizon tasks delegated for minutes to hours.

99.8%

of internal weekly output tokens come from Codex

5×+

growth in active internal users in H1 2026

85%+

avg. Codex output share for non-engineering teams

Codex output token share, by user type

Portion of all AI output that runs through the agent platform.

99.8%

OpenAI internal

63.3%

Organizations

16.5%

Individuals

Tasks are getting longer

Share of individual users assigning Codex work of a given length (as of May 2026).

70.2%

assign tasks equal to 1+ hour of work

25.6%

assign tasks equal to 8+ hours of work

60+ hrs

of agent work per day for top-1% internal users, run in parallel

Non-developer usage growth vs. August 2025

The agent shift is led by teams that don't write code.

189×

Organizations

137×

Individuals

12×

OpenAI internal

What users praise

Non-technical teams can now run coding and automation
Autonomy on long, complex, multi-hour tasks
Spans CLI, cloud, IDE, Chrome and ChatGPT

The persistent complaint

One prompt can eat a few to tens of % of a weekly cap
Higher tiers still hit limits in a short window
Cost management is hard in heavy parallel use

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