Understand billing, then compare your own usage. These guides explain methods; inspect model pages for current observed quotes.
Calculate API costs from actual input and output tokens, understand per-million-token units, conversation history and agent calls, then check original quotes and billing conditions.
Estimate prompt caching costs from actual hits, cache-read and cache-write prices. Avoid counting input tokens twice and check provider-specific billing rules.
Check upstream model identity, region, context length, caching, batch modes and time windows before comparing API costs. Follow a practical process with linked quote evidence.
API prices and usage calculator → · Same-model provider comparisons →