Short answer: Not on its own. Grok Build is xAI's coding agent for the terminal, in beta for SuperGrok and X Premium Plus since May 2026, and it has no calling feature. It takes remote MCP servers with automatic sign-in, so one command adds OsmO and lets it ring a business when a task needs it.
We found no built-in calling in Grok Build.
Run grok mcp add --transport http osmo https://api.getosmo.app/mcp.
Grok Build opens the browser for OsmO's sign-in and stores the token itself.
It also reads servers you added for Claude Code or Cursor.
How it works
- Sign in with your mobile numberYou get 50 free credits. Nothing to pay.
- Add OsmO to Grok BuildChatGPT, Claude, Grok and other apps that take connectors.
- Ask it to callOsmO calls, talks, and tells you what was said.
The full guide
Add OsmO to Grok Build
- Run
grok mcp add --transport http osmo https://api.getosmo.app/mcp(add--scope projectfor one project only). - Start Grok Build. When it first uses OsmO, a browser opens OsmO's sign-in page; enter your mobile number and the code.
- Use
/mcpsin the terminal UI to check the connection.
The server is saved in ~/.grok/config.toml under [mcp_servers.osmo]. If you already added OsmO to Claude Code or Cursor, Grok Build can pick it up from their config files.
| Phone job | Grok Build on its own | Grok Build 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; 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 |
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.
Questions people ask
Is OsmO free to use with Grok Build?
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.