CobaltCode

CobaltCode gives each coding task its own persistent virtual machine, aimed at teams running AI coding agents like OpenAI's Codex. Instead of a coding agent working in a throwaway container that resets between sessions, CobaltCode keeps a dedicated VM per task with its own repository checkout, installed dependencies, running background services, and agent session state intact, so an agent or a human can pick a task back up later without re-provisioning the environment from scratch. Because the app itself can also run inside the VM, a team can preview different in-progress features side by side, each in its own isolated environment, rather than juggling local branches or shared staging servers. The product positions itself as a CLI-first tool for engineering teams, distinct from OpenAI's own Codex computer-use feature, which runs agents inside OpenAI's sandboxed cloud rather than a team-managed, persistent one. It was announced via a Show HN post on July 23, 2026, and appears aimed at engineering teams already using AI coding agents day-to-day rather than individual hobbyist developers. Because the tool's own website blocked automated access during this research, details on pricing, supported platforms, and integrations could not be independently confirmed and are left unspecified here.