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Developer 3s Key Decision Metrics

TL;DR Verdict
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Codex · Codex Cloud
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At DevDay (2026-09-29) OpenAI shipped reusable Codex Cloud environments: publish a project setup (repos, deps, tools, network secrets), then each task runs in its own VM workspace and can continue while your laptop sleeps. Docs: learn.chatgpt.com/docs/cloud and Help Center. Rolling out to Plus/Pro and workspace plans; saved VM state recoverable ~7 days by default. No invented SWE scores.

Key Takeaways

  • ✓Official: learn.chatgpt.com/docs/cloud; Help: Using Codex Cloud (recently updated)
  • ✓Flow: create/publish environment on web/desktop → Codex inspects GitHub repos & installs deps → start tasks from any supported surface including mobile; each task is isolated
  • ✓SiliconANGLE (Sep 29): Plus VMs are half the CPU/RAM of Pro/Business/Enterprise; no GitLab/self-hosted GHES yet; no computer/browser use in cloud environments
  • ✓Saved VM state recoverable ~7 days after last start/resume by default; Enterprise sharing covers setup, not other people’s tasks
  • ✓Legacy Code Review / Linear / GitHub integrations stay on Codex Cloud (Legacy); migration is opt-in
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Project Links & Resources

Direct Access
Direct access to official project resources and documentation
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Codex Cloud docs (ChatGPT Learn)
learn.chatgpt.com/docs/cloud
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Using Codex Cloud — OpenAI Help Center
help.openai.com/en/articles/20001545-using-codex-cloud
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SiliconANGLE: reusable Codex cloud environments (Sep 29, 2026)
siliconangle.com/2026/09/29/openais-codex-gets-reusable-cloud-environments-that-follow-developers-across-devices/
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ChatGPT Learn: Sep 28–Oct 2 what’s new (Codex Cloud environments)
learn.chatgpt.com/docs/whats-new/september-28-october-2-2026
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In-Depth Technical Analysis

Why it matters

Local coding agents stop when the laptop sleeps. OpenAI’s DevDay (2026-09-29) Codex Cloud reusable environments turn repo setup, install scripts, tools, and network credentials into a publishable template so each task can run in its own cloud VM and continue from web, desktop, or mobile. Canonical docs: Codex Cloud and Using Codex Cloud; contemporaneous coverage: SiliconANGLE.

Architecture

A published environment binds GitHub repositories, install/start skills, outbound network presets, and network secrets (proxy injects real values for allow-listed domains). Each new task gets an isolated workspace; uncommitted work stays with that task across devices. Help Center: saved VM state is recoverable for about 7 days after last start/resume. Enterprise sharing exposes setup to teammates, not their tasks or repo ACLs. Code Review / Linear / GitHub integrations remain on Codex Cloud (Legacy) until you migrate.

Evidence

No official SWE-bench-style scores for this product surface. Documented limits: no GitLab / self-hosted GHES yet; no computer/browser use in cloud environments; Plus VMs are about half the CPU/RAM of higher tiers (SiliconANGLE). Validate on your own install success, resume reliability, and PR quality—do not treat marketing workflow demos as coding benchmarks.

Try it

In ChatGPT web/desktop: Work in → Cloud → create/select environment → connect GitHub → Get started → Publish → Start a new task (mobile can drive published envs). Prefer network secrets + tight egress. Codex Cloud is not covered by OpenAI’s BAA—do not process PHI. Pilot on a fork before migrating Legacy review workflows.

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