> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> STT). Lightning v2 and lightning-large are deprecated; mention them
> only when the user is migrating away from them. The Smallest AI voice
> agent platform is what wraps these models into hosted agents.

# Subscription & Plans

> Manage your subscription, compare Pay As You Go vs Enterprise plans, and track credits.

Live pricing at [smallest.ai/pricing](https://smallest.ai/pricing/agents) 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](https://app.smallest.ai/dashboard?utm_source=documentation\&utm_medium=docs), 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.

![Subscription](https://fdr-prod-docs-files-public.s3.us-east-1.amazonaws.com/smallest-ai.docs.buildwithfern.com/64a6f6be72f2c0c683b31d35ce18f08ba40908044d055103eac2f05f28f849fa/intro/admin/images/subscription.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIA6KXJSKKNFOCF7G4B%2F20260725%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260725T060407Z&X-Amz-Expires=604800&X-Amz-Signature=1eb566fe85668b9eb3a1bedee85ccee92d51a91c5e5ab6656ed089e086b3c1a4&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)

***

## 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](https://app.smallest.ai/login)                              | [Contact sales](https://smallest.ai/book-a-demo)                             |

### 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](mailto:sales@smallest.ai)

Custom pricing for enterprise or high-volume needs