AI API Cost Calculator
Estimate your monthly spend across OpenAI, Anthropic, and more. Enter your usage below — costs update instantly.
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Same workload, every model — ranked by monthly cost.
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Why Tracking Matters
Estimates are a starting point — real API costs drift. Usage spikes during marketing campaigns, agent loops can run unchecked, and model price changes don't always make the news. Teams that rely on manual spreadsheet estimates routinely discover their actual bill is 2–5× what they expected.
Proactive monitoring closes the gap. Setting up spend alerts takes five minutes and catches runaway costs before they hit your invoice. For teams running AI agent fleets, treating your AI spend like a budget line — with limits, alerts, and rollup visibility — is the difference between predictable costs and budget shock.
See how SpendPilot compares to other monitoring tools in our full comparison of AI cost monitoring platforms, or read the buyer's guide to AI cost monitoring tools.
SpendPilot monitors this automatically
Connect your OpenAI or Anthropic account once. Get real-time spend tracking, budget alerts, and cost anomaly detection — no spreadsheets required.
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