Codex in ChatGPT Mobile: iOS, Android, Free Access, Mac Tether

What a phone can now do

OpenAI's announcement describes a phone as a full client for an active Codex session: reviewing outputs and approving commands, working across threads, seeing live screenshots, terminal output, diffs and test results, and starting new tasks without opening a laptop. [2]

Access rolled out on iOS and Android in preview, to every ChatGPT plan including Free and Go, not gated behind a paid tier the way some Codex features have been. [2][1]

It still needs a desk somewhere

The phone is a window onto a Codex session running elsewhere, not a standalone agent. OpenAI's own description requires the Codex app running and updated on a Mac (a laptop, a Mac mini, or a remote environment reachable through it), with Windows support described only as coming soon at launch; the mobile client reaches that machine through a relay layer rather than a direct connection to it. [2]

Atlas interpretation: That dependency is the honest limit of the feature. Nothing in the announcement lets Codex start a task from a phone with no other machine involved; what changed is where a person has to be while an already-running task needs a decision, not where the work itself can happen. [2]

OpenAI framed the scale behind the release by noting that more than 4 million people now use Codex every week, and said the mobile client was built because those small moments of waiting on an approval add up at that volume. [2]

One step in a longer rollout

Atlas interpretation: Codex began as a private beta for turning natural language into code, years before it became the branded coding agent this mobile client extends. The name has been reused for different products since; the agent that gained a phone interface here is the one folded into GPT-5.3-Codex earlier in 2026, and mobile access is a distribution move for that product rather than a new model or a new capability in its own right. [2]

Catching up to a feature Anthropic already had

Atlas interpretation: Anthropic had already shipped a comparable idea for Claude Code, Dispatch, which starts and steers coding sessions from a phone so the desk can stay empty. Coverage of the Codex rollout placed it in that same race explicitly, treating a phone client as a now-expected feature for a coding agent rather than a novelty, and noting OpenAI's broader pattern of undercutting on price and access to hold usage as Anthropic's offerings get more expensive. [3]