Simple, Transparent Pricing

Only pay for the Kalem voice engine. Bring your own OpenAI keys and SIP trunks — you control the costs.

Recommended

Pay As You Go

Self-service · Full control

$0 /month
$0.04 /min — Kalem voice engine

OpenAI & telephony costs billed directly by providers (BYOC)

  • 100 free minutes to get started (one-time)
  • Bring Your Own Keys (OpenAI API)
  • Bring Your Own SIP Trunks
  • Unlimited agents & knowledge bases
  • Real-time dashboard & call analytics
  • Webhook integrations & API access
  • Community support
Start Free — No Credit Card
Managed Service

Enterprise

Fully managed · White glove

Custom

Tailored to your volume & needs

Volume discounts

Custom rates based on your usage profile

  • Everything in Pay As You Go
  • Dedicated prompt engineering & agent setup
  • CRM & n8n workflow integrations
  • Custom system instructions & fine-tuning
  • Priority support with dedicated account manager
  • SLA guarantees & uptime commitment
  • Rollover unused minutes (up to 2x cap)
  • Whitelabel & multi-tenant options
Contact Sales

Start free with 100 one-time minutes. No credit card required.

Cost Calculator

See how much you save with Kalem's BYOC model

100 2,500 5,000 7,500 10,000
Kalem (BYOC)
$
Engine only · $0.04/min
Retell AI
$
All-in · ~$0.07/min
Synthflow
$
Bundled plan pricing
Save up to $/month with Kalem

* Kalem price is engine only — add your OpenAI Realtime costs (Mini ~$0.02-0.05/min · Standard ~$0.06-0.10/min) + telephony (~$0.01-0.02/min)

Plan Comparison

Feature Pay As You Go Enterprise
Monthly fee $0 Custom
Kalem engine rate $0.04/min Volume discounts
Free minutes 100 (one-time) Included in plan
OpenAI API keys BYOC (your keys) Managed or BYOC
SIP trunks / telephony BYOC (your trunks) Managed or BYOC
Agents & knowledge bases Unlimited Unlimited
Webhook & API access
Prompt engineering & setup Self-service
CRM & n8n integrations —
Dedicated account manager —
SLA & uptime guarantee —
Rollover unused minutes — Up to 2x cap
Whitelabel options —

Frequently Asked Questions

Kalem charges only for the voice engine orchestration ($0.04/min). You connect your own OpenAI API key for the AI model and your own SIP trunk (e.g., Twilio, Telnyx) for telephony. This gives you full cost transparency — no markups on LLM or telecom usage.
Every new account receives 100 free Kalem engine minutes as a one-time credit. These don't expire and don't renew monthly. Once used, you'll be billed at $0.04/min. No credit card is required to start.
It depends on your providers and which OpenAI model you choose. With gpt-realtime-mini: $0.04 Kalem + ~$0.02-0.05 OpenAI + ~$0.01-0.02 telephony = ~$0.07-0.11/min. With gpt-realtime (standard): $0.04 Kalem + ~$0.06-0.10 OpenAI + ~$0.01-0.02 telephony = ~$0.11-0.16/min. Compare this to bundled platforms charging $0.07-0.13/min with less transparency and control.
You can try the platform with the 100 free minutes using Kalem's built-in keys. To continue beyond that, you'll need your own OpenAI API key — which you can generate at platform.openai.com in seconds.
Enterprise is ideal if you need hands-on help with prompt engineering, CRM integrations, dedicated support, or SLA guarantees. It's a managed service — we handle the setup and optimization so your team can focus on your business.

Ready to Get Started?

Start free with 100 one-time minutes. No credit card required.

Start Free — No Credit Card