# What the original Codex cloud preview introduced

> The May 2025 agent ran repository tasks in separate cloud environments and proposed changes for review.

Source: https://fullbytedeveloper.com/blog/codex-cloud-research-preview-2025
Originally posted: 2025-05-19
Published here: 2026-11-06

OpenAI launched the Codex cloud research preview on May 16, 2025. Each task ran in its own sandbox environment with the user's repository, allowing multiple tasks to proceed in parallel [1].

## What a task could produce

The announcement described writing features, fixing bugs, answering repository questions and proposing pull requests. The initial system used codex-1, a version of OpenAI o3 optimized for software engineering [1].

That model name and launch configuration are historical details. They should not be assumed to describe every current Codex product.

## Parallel tasks still need review

Independent environments help separate work, but they do not establish that every proposed change fits together. Give each task a clear objective and acceptance criteria, then inspect the resulting diff and relevant checks before merging.

For example, a documentation update and a focused bug fix can be reviewed separately. Two changes to the same interface need a check that their assumptions still agree.

The announcement also recorded later updates to availability and network access [1]. When setting up Codex today, use current documentation for the environment and permissions rather than copying the limits of the original research preview.

## Sources

1. [OpenAI: Introducing Codex, May 2025](https://openai.com/index/introducing-codex/)

## Original posts

- [Instagram post](https://www.instagram.com/fullbytedeveloper/p/DJ0DXcosD_b/)