Smallest.ai Atoms vs Retell AI
Pricing last verified from each vendor's own site.
Verdict
Smallest.ai bills from $0.05/min, typically $0.09 to $0.21/min by model choice, with $10 free credits. Retell is $0.07 to $0.31/min pay as you go, also with $10 free credits.
- Consider Smallest.ai Atoms if: You want Smallest's in-house voice models at the lower end of the range.
- Consider Retell AI if: You want Retell's mature agent builder and integrations.
Factual summary
- Both are listed under Voice AI & Dialers.
- Directly comparable starting prices are not available for both: Smallest.ai Atoms — Pay as you go with $10 in free credits: voice agents from $0.05/min, typically $0.09 to $0.21/min depending on the models chosen (hosting $0.01/min flat, speech-to-text about $0.009/min, LLM at cost, text-to-speech about $0.09/min, or speech-to-speech); phone numbers $10/mo; HIPAA zero data retention add-on $1,000/mo; enterprise custom; Retell AI — Pay as you go, $0.07–$0.31/min; $10 free credits.
- Smallest.ai Atoms lists channels Retell AI does not: sms.
This is a factual comparison drawn from vendor sites, not a recommendation. Which fits depends on your channels, volume and budget.
| Smallest.ai Atoms | Retell AI | |
|---|---|---|
| Summary | Voice AI agent platform with its own speech models, priced per minute by model stack. | AI phone agents priced per minute. |
| Starting price | See vendor | See vendor |
| Pricing details | Pay as you go with $10 in free credits: voice agents from $0.05/min, typically $0.09 to $0.21/min depending on the models chosen (hosting $0.01/min flat, speech-to-text about $0.009/min, LLM at cost, text-to-speech about $0.09/min, or speech-to-speech); phone numbers $10/mo; HIPAA zero data retention add-on $1,000/mo; enterprise custom | Pay as you go, $0.07–$0.31/min; $10 free credits |
| Model | usage | usage |
| Free trial | — | — |
| Free plan | — | — |
| Channels | phone, sms | phone |
| Last verified | 2026-11-02 | 2026-10-28 |
FAQ
What is the difference between Smallest.ai Atoms and Retell AI?
Smallest.ai bills from $0.05/min, typically $0.09 to $0.21/min by model choice, with $10 free credits. Retell is $0.07 to $0.31/min pay as you go, also with $10 free credits.
Which is cheaper, Smallest.ai Atoms or Retell AI?
We can't compare entry prices directly. Smallest.ai Atoms: Pay as you go with $10 in free credits: voice agents from $0.05/min, typically $0.09 to $0.21/min depending on the models chosen (hosting $0.01/min flat, speech-to-text about $0.009/min, LLM at cost, text-to-speech about $0.09/min, or speech-to-speech); phone numbers $10/mo; HIPAA zero data retention add-on $1,000/mo; enterprise custom. Retell AI: Pay as you go, $0.07–$0.31/min; $10 free credits.
When should I choose Smallest.ai Atoms over Retell AI?
Consider Smallest.ai Atoms if: You want Smallest's in-house voice models at the lower end of the range. Consider Retell AI if: You want Retell's mature agent builder and integrations.
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