> ## Documentation Index
> Fetch the complete documentation index at: https://ona.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Cost & Budgets
> Understand usage and OCU billing for Core Ona Cloud organizations.
This page covers usage for **Core** organizations using Ona Cloud.
Enterprise organizations use a separate usage view and billing model. In Enterprise, usage is billed in credits rather than OCUs, and **Settings → Cost & Budgets** opens the enterprise view instead of the OCU view described here. See [User budgets](/ona/billing/user-budgets) for per-user budgeting in Enterprise.
An **OCU (Ona Compute Unit)** measures resource consumption for Core plans. Your subscription balance is consumed in OCUs as you use environments and AI features.
## Access requirements
Organization admins and members with the [Billing Viewer](/ona/organizations/organization-roles#billing-viewer) role can view **Settings → Cost & Budgets**. Billing Viewers can read usage data, but cannot add credits, change budgets, or update billing settings.
## Consumption rates
### Environments
OCUs are consumed while environments are running, based on size:
| Environment | Resources | Rate |
| --------------- | ------------------- | ----------- |
| Standard | 4 vCPUs / 16GB RAM | 1 OCU/hour |
| GPU-accelerated | 16 vCPUs / 64GB RAM | 7 OCUs/hour |
### Agentic tasks
Approximate OCU consumption for AI tasks:
| Task | OCUs |
| -------------------------------- | ---- |
| Explain a small codebase | 1 |
| Explain a large codebase | 3 |
| Create a new web app | 4 |
| Add a feature to medium codebase | 8 |
### Codex with a connected ChatGPT plan
If you [connect Codex to your ChatGPT account](/ona/integrations/configure-codex), Codex model requests use your ChatGPT plan instead of Ona-managed model credits. Ona does not charge OCUs for that Codex model usage.
The environment still consumes OCUs while it is running. OpenAI manages ChatGPT-side rate limits and usage limits.
## Tracking your usage
To see how your organization is spending credits, go to **Settings → Cost & Budgets**. The Cost & Budgets page gives you a clear picture of your credit consumption over the last 7 or 30 days.
At the top, a credit summary shows your total balance, how many credits you've used, and how many are still available. Below that, a daily consumption chart breaks down your spending over time so you can spot trends or unexpected spikes.
If your credits are running low, a banner appears with an estimate of how many days you have left at your current pace so you can top up or adjust your usage before you hit zero.
## Credit expiration
* **Core subscription credits** renew monthly as long as your subscription is active. They do not roll over.
* **Top-up credits** are valid for up to 1 year while you have an active subscription. Without an active subscription, top-up credits expire when the subscription ends.
* **Usage order**: Subscription credits are consumed first, then top-up credits. Bonus/gift credits are used last and typically have a longer expiration.
## Running low on credits?
* [Enable auto top-up](/ona/billing/overview#automatic-credit-top-up) to add credits automatically when your balance is low
* [Top up credits](/ona/billing/overview#credit-top-up) for a one-time purchase
* [Review Core subscription options](/ona/billing/overview#core-subscription) for more monthly credits
## Next steps
* [Billing overview](/ona/billing/overview) - Manage subscriptions and payments
* [Organizations overview](/ona/organizations/overview) - Understand where usage is owned and administered