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OpenAI Expands Codex With Reusable Cloud Environments, Code Review and Security Tools at DevDay

September 29, 2026 at 19:14 EDT

Software Dev & Coding
AI Agents
Security

OpenAI used DevDay on September 29, 2026 to push Codex further into day-to-day software engineering, adding reusable cloud development environments, a dedicated code-review workflow, CLI improvements and security tools aimed at keeping parallel coding work moving. The updates shift Codex from a task-by-task coding assistant toward a more persistent agent system that can work across desktop, web, mobile, repositories and review queues.

September 29, 2026 · OpenAI

Codex moves into the cloud workflow

OpenAI used DevDay to expand Codex with reusable cloud environments, integrated code review, CLI updates and security scanning for long-running development work.

5M+

weekly Codex users reported in June

400%

growth earlier in 2026

30M+

commits scanned by Codex Security Cloud

70%

more pull requests merged weekly inside OpenAI

Adoption scale: earlier 2026 to June

A 400% increase means weekly usage rose to more than five times the earlier baseline.

1xearlier baseline

5x+5M+ weekly users

1. Prepare

Choose repositories, tools, dependencies and access rules for a reusable environment.

2. Run

Start independent tasks that can continue while the computer is asleep.

3. Review

Inspect diffs, checks and findings before committing, commenting or merging.

What developers gain

Reusable setup across tasks
Parallel work from cloud, desktop, web or mobile
Pull-request context in one review pane

What still needs care

Gradual rollout across accounts
GitLab support remains partly in preview
Generated findings and fixes require verification

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