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OpenAI’s Codex DevDay Updates: Reusable Cloud Environments, Voice and More
At its September 29, 2026 DevDay, OpenAI announced reusable Codex cloud environments for Plus, Pro, Business, Healthcare, Education and Enterprise. Developers can start or steer work across desktop, web and mobile, with isolated cloud workspaces, voice controls, task delegation and new review and security features.
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Key takeaways
- At its September 29, 2026 DevDay, OpenAI announced reusable Codex cloud environments for Plus, Pro, Business, Healthcare, Education and Enterprise.
- Developers can start or steer work across desktop, web and mobile, with isolated cloud workspaces, voice controls, task delegation and new review and security features.
- Ultrafast promises up to 8× faster token generation in Codex, while OpenAI’s Agents API adds a broader hosted platform for tools, memory and multi agent work.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did OpenAI announce for Codex at its September 2026 DevDay, and how do its reusable cloud development environments change where and how. Article summary: At its September 29, 2026 DevDay, OpenAI presented Codex as a coding agent that can work locally or in the cloud, with cloud tasks continuing after a developer closes their laptop. The announcements also added new ways t. Topic tags: general, documentation, general web, user generated. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks,
OpenAI’s September 29, 2026 DevDay updates push Codex beyond a coding session tied to one computer. Developers can start tasks from different devices, reuse a prepared cloud environment and let work continue while their computer is asleep. OpenAI also announced new ways to steer and delegate tasks, review code, scan for security issues and speed up generation. 10
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Codex cloud environments: what changes
Codex can run on a computer, be controlled remotely from a phone, or run in the cloud from another device. A reusable environment bundles the project’s repositories, tools, dependencies and access settings, so developers can start new tasks using a prepared setup rather than configuring each one from scratch. 10
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Each cloud task gets its own isolated workspace, and tasks can continue while the developer’s computer is asleep. In Enterprise workspaces, authorized members can share reusable environments, subject to the workspace’s access settings. 6
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OpenAI listed Codex cloud environments for Plus, Pro, Business, Healthcare, Education and Enterprise. Availability of the cloud environment is separate from access to the premium Ultrafast speed tier. 11
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Voice controls and task delegation
The Codex CLI gained two-way voice interaction, allowing developers to start and guide tasks by speaking. Its new /agents view helps users delegate work and track multiple tasks. 9
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These changes complement Codex’s cross-device cloud workflow: developers can hand off work, check progress elsewhere and return to review results without keeping a laptop open for the task to run. 6
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Code review and security updates
A new code-review experience in the ChatGPT desktop app brings review into a workflow where developers can read summaries, inspect diffs and ask Codex about potential issues before providing feedback. 11
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OpenAI also announced Codex Security Cloud for repository vulnerability scanning, investigation, deduplication and proposed fixes. The announcement describes the product’s intended capabilities; it does not, by itself, establish which plans can access them. 12
Ultrafast is a separate speed tier
OpenAI said its premium Ultrafast tier can deliver up to 8× faster token generation in Codex, reaching up to 300 tokens per second. GPT-6 Astra Ultrafast is available in Codex for Pro 500 and Enterprise; GPT-6.1 Sol Ultrafast was announced as coming later. These plan details should not be confused with the broader list of plans that include Codex cloud environments. 10
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How Codex fits into OpenAI’s agent platform
The Codex updates arrived alongside the Agents API in public beta, which OpenAI described as providing hosted execution, memory, tools and multi-agent support. Together, the announcements point toward coding work that can be handed off to agents, run in the cloud and reviewed across devices—not just performed in a local terminal session. 9
The practical shift is straightforward: teams can reuse a shared development setup, let isolated tasks run remotely and check the work later. Codex’s laptop-closed workflow is the clearest expression of that change, while the new voice, delegation, review and security features add more ways to manage work that continues in the background. 6
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What is the short answer to "OpenAI’s Codex DevDay Updates: Reusable Cloud Environments, Voice and More"?
At its September 29, 2026 DevDay, OpenAI announced reusable Codex cloud environments for Plus, Pro, Business, Healthcare, Education and Enterprise.
What are the key points to validate first?
At its September 29, 2026 DevDay, OpenAI announced reusable Codex cloud environments for Plus, Pro, Business, Healthcare, Education and Enterprise. Developers can start or steer work across desktop, web and mobile, with isolated cloud workspaces, voice controls, task delegation and new review and security features.
What should I do next in practice?
Ultrafast promises up to 8× faster token generation in Codex, while OpenAI’s Agents API adds a broader hosted platform for tools, memory and multi agent work.