Smallest AI vs Cartesia: Features, Pricing and User Reviews 2026

Smallest AI uses a pay as you go pricing model for its Agents and Models. New users start with $10 in free credits and only pay for what they use afterward.

Agent calls cost between $0.09 and $0.21 per minute depending on the model used, and text messages cost $0.005 each. Add-ons include Knowledge Base storage at $3 per GB per user, Knowledge Base queries at $2 per 1,000 queries, and PII removal at $0.01 per minute. Renting a phone number costs $10 per month.

For voice models, Lightning text to speech costs $0.175 per 10,000 characters, while Pulse speech to text starts around $0.003 per minute.

Larger teams can choose the Enterprise plan, which offers custom pricing, dedicated infrastructure, priority support, and compliance features, with agent calls priced as low as $0.05 per minute.

Cartesia offers five pricing plans, from a free plan to a custom Enterprise option, so both small projects and large companies can find a fit.

• Free ($0/month): 20K credits a month plus $1 in prepaid agent usage, with access to Text to Speech and Speech to Text.

• Pro ($5/month): 100K credits a month, commercial use rights, and instant voice cloning.

• Startup ($49/month): 1.25M credits a month, professional voice cloning, and organization accounts.

• Scale ($299/month): 8M credits a month, priority support, and higher concurrency limits.

• Enterprise (Custom pricing): Custom credits, volume pricing, custom concurrency, SSO, and compliance agreements.

Extra charges apply for things like phone numbers ($0.014 per minute) and voice agent call minutes ($0.06 per minute), and subscriptions can be paused or cancelled anytime.