Subscription & Plans | Smallest AI Docs

Live pricing at smallest.ai/pricing is the source of truth. This page mirrors the current pricing tiers and per-model rates. If the numbers below differ from the live page, defer to the live page.

Location: On app.smallest.ai/dashboard, click the settings icon in the bottom-left of the sidebar. Subscription and billing live in two tabs:

Billing & Invoices. Payment methods + invoice history.
Explore Plans. Compare plans and upgrade or downgrade.

Manage subscription

The Explore Plans tab shows the available plans and marks your current one as CURRENT. To change plans, pick a plan and click Upgrade or Downgrade Plan.

The Billing & Invoices tab shows:

Section	What’s there
Payment Method	Card on file. Added charges, auto-recharge credits, and invoices are billed to this card.
Invoices	All / Pending / Paid filters over your invoice history

To add or change your card, click Add Payment Method on the Billing & Invoices tab.

Plans

Two plans: Pay As You Go and Enterprise. Pay As You Go starts with $10 in free credits and full access. Enterprise is quoted per-team based on volume, SLA, and compliance needs.

Overview

	Pay As You Go	Enterprise
Best for	Builders, pilots, and small-scale deployments. No monthly commitment.	Production workloads at scale. Reliability, security, and dedicated support.
Number of agents	Unlimited	Unlimited
Free credits	$10 to start	Custom
Getting started	Sign up	Contact sales

Price per call

Depends on the architecture you choose. Cascading stacks (Hosting + STT + LLM + TTS + Telephony) bill each layer separately; speech-to-speech stacks (Hosting + S2S + Telephony) bill the S2S layer as one line.

	Pay As You Go	Enterprise
Price per call	$0.09 –$ 0.21 / min (depending on models selected)	As low as $0.05 / min
Smallest Hosting fees	$0.01 / min, flat rate	Custom

Models

Per-minute rates for each layer in the stack. Model prices pass through at cost; Smallest adds the Hosting fee above.

Model / layer	Pay As You Go	Enterprise
Speech to Text layer	~$0.009 / min	Custom
LLM layer (at cost)
ChatGPT 4.0	~$0.0448 / min	Custom
ChatGPT 4.1	$0.045 / min	Custom
ChatGPT 5.2	$0.056 / min	Custom
Electron (in-house)	Not accessible	Accessible
Text to Speech layer	~$0.09 / min	Available
Speech to Speech layer (at cost)
ChatGPT Realtime	~$0.10 / min	Custom
ChatGPT Realtime Mini	~$0.02 / min	Custom

Concurrency

	Pay As You Go	Enterprise
Concurrency included	20 concurrent calls	Custom
Additional concurrency	Not available	Custom

Telephony

	Pay As You Go	Enterprise
Rent a phone number	$10 / number / month	Custom
External telephony provider (BYOT)	At cost	At cost

Campaigns

Feature	Pay As You Go	Enterprise
Campaigns	Yes	Yes
Advanced Campaigns	No	Yes (Coming Soon)
Text Message	$0.005 / message (Coming Soon)	Custom
Testing Suite	Basic	Yes

Agent add-ons

Feature	Pay As You Go	Enterprise
Knowledge Base	$3 / GB / user	Custom
Knowledge Base Query	$2 / 1K queries	Custom
PII Removal	$0.01 / min	Custom
Post-Call Analytics	10 per agent	Yes
Web Widget	Yes	Yes
Custom Integration	No	Yes
Advanced Denoising	No	Custom
Custom Branding	No	Yes

Reliability & support

Feature	Pay As You Go	Enterprise
Email Support	Yes	Yes
Community Support	Yes	Yes
Infra SLA (Guaranteed Uptime)	Not included	Enterprise-grade, 99.99%
Extra Custom Agent Setup	No	Custom
Priority Support	No	Yes
Prompt Engineering Support	No	Yes
On-premise Deployment	No	Yes
HIPAA Zero Data Retention	Add-on: $1,000 / month	Yes
Compliance (SSO, SOC 2)	No	Yes

Questions?

Contact Sales

Custom pricing for enterprise or high-volume needs