Short answer: Not out of the box. Codex is OpenAI's coding agent: it reads your repository, runs commands and writes code, but it has no phone line. It does take remote MCP servers, so you can add OsmO with one command. After that, Codex can ring a business when a task needs an answer that only a person on the phone has.
We found no built-in calling in Codex.
Run codex mcp add osmo --url https://api.getosmo.app/mcp, then codex mcp login osmo.
The same config is shared by the Codex CLI, the IDE extension and the ChatGPT desktop app.
50 free credits to start; an answered call uses 3.
How it works
- Sign in with your mobile numberYou get 50 free credits. Nothing to pay.
- Add OsmO to CodexChatGPT, Claude, Grok and other apps that take connectors.
- Ask it to callOsmO calls, talks, and tells you what was said.
The full guide
When a coding agent needs a phone
Most of the time it does not. But some jobs stall on a question no website answers: is the supplier's warehouse open on Saturday, does the venue have step-free access, will the vet take a walk-in. With OsmO connected, Codex can make that call in the middle of a task and carry on with the answer.
| Phone job | Codex on its own | Codex with OsmO |
|---|---|---|
| Ring a shop, clinic or restaurant and ask a question | No documented way | Yes |
| Find the business's number for you | It can search the web; no documented dialling | Yes, from its public listing |
| Work a phone menu and wait on hold | Not documented | Yes |
| Makes calls for you if you live in Canada, the UK or Australia | Not documented | Yes: sign in with your local mobile number |
| Cost to try | Not applicable | 50 free credits, about 16 answered calls |
Add OsmO to Codex
- Run
codex mcp add osmo --url https://api.getosmo.app/mcp. - Run
codex mcp login osmo. A browser opens OsmO's sign-in page; enter your mobile number and the texted code. - Ask Codex for a call in plain words, with the business and the question.
If you prefer editing config, the server lives under [mcp_servers.osmo] with url = "https://api.getosmo.app/mcp" in ~/.codex/config.toml. In the IDE extension, use the gear menu → MCP servers → Add server. Codex supports both ways OsmO can register a sign-in client (dynamic registration and client metadata documents).
What it costs
OsmO For my AI starts with 50 free credits when you sign in with your mobile number, with no card. An answered call uses 3 credits however long it lasts, and a call nobody answers is free, so the free credits cover about 16 answered calls. When they run out you can keep calling from the OsmO app.
Where it works
You can sign in with a mobile number from the United States, Canada, the United Kingdom or Australia (India too), and calls are placed from the OsmO number for your country. OsmO calls listed businesses in your own country, such as shops, clinics, restaurants and offices, and toll-free helplines. With the free web credits it does not call personal numbers; with the OsmO app it can also call your saved contacts.
Questions people ask
Does ChatGPT on the web see the Codex config?
No. The web version does not read local config. In ChatGPT on the web, connect OsmO from the plugin directory instead.
Is OsmO free to use with Codex?
You start with 50 free credits and no card. An answered call uses 3 credits, so that is about 16 calls; unanswered calls are free.
Sources
Checked November 13, 2026. Vendors change their products often; follow the links for the current version.