OpenAI
OpenAI GPT API
A practical guide to estimating GPT API spend across input, output, cached tokens and tool calls.
Read guide →Pricing intelligence
AI API pricing guides
Use the calculator for a quick estimate, then verify the final rate with the provider. These guides make the assumptions visible instead of pretending prices never change.
Editorial framework reviewed 2026-08-13.
Anthropic
Anthropic Claude API
A practical guide to estimating Claude API spend, including long-context work and prompt-caching decisions.
Read guide →Google Gemini API
A practical guide to estimating Gemini API spend across text, multimodal prompts, cached context and grounding.
Read guide →