Use Codex in ChatGPT mobile for OpenAI's first-party experience. Choose Pairlet when you want an MIT-licensed remote you can inspect and self-host, or one app for both Codex and Claude Code.
- Official mobile
- ChatGPT for iOS and Android
- Pairlet backend
- Codex CLI on your computer
- Pairlet account
- Not required
Option 1: Codex in ChatGPT mobile
OpenAI announced a Codex mobile preview on May 14, 2026. Its official post says Codex is available in ChatGPT on iOS and Android across all ChatGPT plans, including Free and Go. It also says the mobile connection keeps files and credentials on the computer and uses a secure relay.
The same announcement said phone-to-Codex support on Windows was “coming soon.” Because rollout details can change, check the linked OpenAI page and current ChatGPT app before relying on a specific platform or plan.
Option 2: Pairlet
Pairlet connects its mobile or desktop client to a daemon on your computer. The daemon drives the local Codex CLI; your repository and credentials remain on that computer. In the client you can start or resume sessions, stream events, inspect diffs, interrupt work, and respond to approval requests.
- Install the Pairlet client.
- Install and pair the daemon on the computer that runs Codex.
- Choose Codex when creating a session, then select a project and permission preset.
For exact installation commands, use the current Pairlet README.
What is different?
| Question | Codex in ChatGPT mobile | Pairlet |
|---|---|---|
| Provider | OpenAI, first party | Independent open-source project |
| Agent support | OpenAI Codex | OpenAI Codex and Claude Code |
| Client account | ChatGPT account and plan access | No Pairlet account |
| Source / hosting | Use OpenAI's product | MIT source; relay can be self-hosted |
| Best fit | Official Codex workflow | Cross-agent use and deployment control |
Independent project: Pairlet is not affiliated with or endorsed by OpenAI. OpenAI and Codex are trademarks of OpenAI.
Security and limits
Pairlet's client-to-daemon messages use P-256 ECDH, HKDF, and AES-256-GCM. The relay routes encrypted frames without endpoint private keys. Read the security model and limitations for the full boundary.
Important: Pairlet's local daemon is not an operating-system sandbox. Codex executes within the permissions and sandbox policy configured on your computer. Full-auto modes can run commands without a per-step confirmation.
Sources
- OpenAI — Work with Codex from anywhere (official mobile announcement, availability, and architecture claims).
- Pairlet source repository (license, installation, architecture, and Codex support).
Availability and plan details can change. Facts above were checked on July 13, 2026.