Breaking

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

September 29, 2026 at 19:11 EDT

Software Dev & Coding
AI Agents
Security

OpenAI used DevDay 2026 to push Codex beyond a local coding assistant and into a cloud-based software workflow for writing, reviewing and securing code across devices. The company announced reusable Codex Cloud environments, a refreshed Codex CLI, a new desktop code review experience, Codex Security Cloud, GPT-6.1 Sol access for Codex users and additional agent API updates.

Sep 29, 2026 · OpenAI

Codex becomes a cloud workflow

DevDay moved Codex toward reusable environments, automatic reviews, repository security scans and faster model options for agentic software work.

20+

DevDay announcements across models, Codex and AI workspaces

1.2B

weekly users for the shared ChatGPT surface OpenAI cited

$0.10

per million cached input tokens for GPT-6.1 Sol

30M+

commits analyzed in reported Codex Security Cloud results

Ultrafast changes the speed scale

OpenAI says Ultrafast can reach up to 8x faster token generation in Codex.

Standard

Ultrafast in Codex

The new Codex loop

Publish setup

Repos, tools, dependencies and access

→

Run in cloud

Tasks continue while a device is away

→

Review and ship

Inspect diffs, tests and findings first

Why teams may use it

Reusable cloud setups reduce project start friction
Automatic reviews can catch issues before humans begin
Security scans can keep checking new commits

What still needs care

Rollout is gradual across accounts and plans
Cloud work still requires human review before shipping
Some data and compliance restrictions remain

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