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Connect OpenAI

oncost tracks your OpenAI API usage at the model and token level. Setup takes about 2 minutes.

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Prerequisites

  • An OpenAI account with API access
  • An API key

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Setup

  1. Go to Settings > Connections > New Connection > OpenAI
  2. Paste your OpenAI API key
  3. Click Test Connection to verify access
  4. Click Save
oncost collects usage data within minutes.

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What oncost collects

  • Daily cost by model (GPT-4o, GPT-4, GPT-3.5, etc.)
  • Token counts (input and output) per model
  • Cost-per-token trends over time

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Subscription plan (optional)

After connecting, you can configure your OpenAI subscription plan so oncost tracks subscription costs alongside API usage. Go to Settings > Connections, click your OpenAI connection, and fill in the Subscription Plan section. Available plans: For Team and Enterprise plans, enter the number of seats. For Enterprise, enter your custom monthly cost. When configured, oncost generates a subscription cost row each month and shows the full picture — subscription cost plus API usage — on the OpenAI provider detail page. This step is optional. If you skip it, oncost still tracks all API usage costs.

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Tips

  • Separate API keys per project to get per-project cost breakdown
  • oncost shows cost-per-token trends in the AI Cost view under Spend