Using AI to find and contact B2B customers in Brazil
ChatGPT and Claude are excellent for defining your ICP, suggesting segments and CNAE codes, writing and personalizing messages, and classifying replies. They do not have an up-to-date database of Brazilian companies and may invent contacts. Use AI for strategy and copy, and a tool built on Brazil's real CNPJ registry for the list and the sending. 1Lead combines both: its AI suggests CNAE codes over the actual company registry and writes the sequence messages.
What AI does well
- ICP and segments: "Besides clinics, who buys clinic management software?"
- Translating the ICP into CNAE codes, including adjacent activities.
- Writing messages per segment, role and channel, including Brazilian Portuguese copy if you don't speak it.
- Personalizing at scale from company data (city, segment, opening date).
- Classifying replies: interested, objection, not interested, unsubscribe.
Where AI fails
- No reliable company list. Asking for "100 clinics in Recife with emails" returns stale or invented data.
- No sending or follow-up on its own.
- No live registration status for a CNPJ.
Run AI on top of real data: the list comes from the CNPJ registry, the AI works on it.
Prompts you can use
1. ICP and segments
I sell [product] to [company type] in Brazil. List 10 segments that buy this, including non-obvious adjacent ones, with each one's reason to buy.
2. CNAE codes
For each segment, suggest the most likely CNAE 2.3 subclasses (code and Portuguese description). Flag any that need checking on IBGE's CONCLA site.
3. First message in Portuguese
Write a WhatsApp opener in Brazilian Portuguese, max 280 characters, for [segment], mentioning [specific pain], ending with a yes/no question. Then give me an English translation.
ChatGPT/Claude vs a B2B data tool
| Task | ChatGPT / Claude | B2B tool with data |
|---|---|---|
| Strategy and ICP | Excellent | Good |
| CNAE suggestions | Good (verify codes) | Excellent, over real data |
| Company list | Unreliable | Excellent |
| Writing messages | Excellent | Good to excellent |
| Sending and follow-ups | No | Yes |
| CRM and metrics | No | Yes |
1Lead lets you describe your ideal customer in one sentence; its AI suggests CNAE codes and segments over Brazil's company registry, builds the filtered list, and writes the email and WhatsApp sequence.
Frequently asked questions
Which AI is best for B2B prospecting?
For strategy and copy, ChatGPT and Claude are comparable; test both with the same prompts. To find real Brazilian companies and run outreach, use a tool built on CNPJ data, such as 1Lead, which includes AI.
Can ChatGPT give me a list of Brazilian companies with contacts?
Not reliably. Language models don't have an up-to-date CNPJ database and may invent names, emails and phone numbers.