Short answer: Vapi is a toolkit for developers who want to build and run their own voice agent: you pick the models, bring a phone number and pay per minute. OsmO is a finished calling service you add to ChatGPT, Claude or another AI app, with nothing to build. If you are building a calling product, Vapi is the better tool. If you just want your AI to ring a business, OsmO is quicker.
Vapi listed hosting at $0.05 a minute on 13 November 2026, plus speech, model, voice and phone costs.
Vapi's free numbers take inbound calls only; outbound calls use a number you import from Twilio, Telnyx or DIDWW.
OsmO needs no code, phone account or model choice: add it to your AI app and ask.
OsmO charges 3 credits per answered call, with 50 credits free.
How it works
- Sign in with your mobile numberYou get 50 free credits. Nothing to pay.
- Add OsmO to ClaudeChatGPT, Claude, Grok and other apps that take connectors.
- Ask it to callOsmO calls, talks, and tells you what was said.
The full guide
Different jobs
Vapi describes itself as a way to build advanced voice AI agents. You design an assistant, choose a transcriber, a language model and a voice, connect a phone number, and run calls from a dashboard or an API. That flexibility is the point: a company can build a support line, a booking agent or an outbound campaign exactly how it wants.
OsmO For my AI is the other way round. The voice agent, the phone line and the menu handling already exist. Your AI app plans the call, OsmO makes it, and the answer comes back to the chat. There is nothing to configure beyond signing in.
| Vapi | OsmO For my AI | |
|---|---|---|
| Who it is for | Developers building voice agents | People who want their AI app to make a call |
| Setup | Create an assistant, import a number, call via dashboard or API | Add a connector, sign in with your mobile number |
| Outbound number | Import from Twilio, Telnyx or DIDWW (free Vapi numbers are inbound only) | Included: the OsmO number for your country |
| Pricing | $0.05/min hosting plus model, voice, transcriber and phone costs | 3 credits per answered call |
| Free to start | $5 in credits | 50 credits, about 16 answered calls |
| Example estimate | $82 to $129 a month for 1,000 minutes (Vapi's own calculator) | Not per minute |
When Vapi is the right choice
- You are building a product that answers or makes calls for your own customers.
- You want to choose and swap the speech, model and voice providers.
- You need features such as concurrency limits, organisations or a HIPAA add-on, which Vapi lists at $2,000 a month.
- You have developers to set it up and keep it running.
When OsmO is the right choice
If the goal is personal or small-team errands, such as booking a table, checking stock or chasing a delivery, building a voice agent is far more than the job needs. With OsmO you skip the phone account, the prompt design and the per-minute maths. It works in ChatGPT, Claude, Grok and other AI apps that take connectors, and in coding agents such as Claude Code, Codex and Cursor.
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.
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.
The bottom line
Vapi and OsmO are not really rivals. Vapi is a set of parts for building a calling product, and it is a strong one if you have developers and a reason to own the whole stack. OsmO is a finished product for people who want calls made without building anything. If you are a developer who simply needs your coding agent to ring a supplier now and then, adding OsmO to Claude Code, Codex or Cursor takes one command and is far less work than standing up a voice agent of your own.
Questions people ask
Can I build my own agent on OsmO?
No. OsmO For my AI is a finished calling service you use from an AI app. If you want to design your own voice agent, a developer platform like Vapi is the right tool.
Do I need a Twilio account for OsmO?
No. Calls are placed from the OsmO number for your country.
Sources
Checked November 13, 2026. Vendors change their products often; follow the links for the current version.
Keep reading
- OsmO vs Retell AI: which do you need?A voice-agent platform for contact centres vs calls from your AI app.Read ›
- OsmO vs Bland AI: enterprise phone agents or a quick call?Enterprise voice-agent infrastructure vs calls from your AI app.Read ›
- Can Claude make phone calls?No built-in calling found. Add OsmO as a custom connector and it can.Read ›