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GPT-6 Cost Calculator is an independent tool that helps developers estimate what the GPT-6 API will cost for their actual workloads — before they ship, before the invoice arrives.
API pricing pages list dollars per million tokens. Real bills depend on token splits, request volume, prompt caching, and service tiers — the multiplication most people never do until it's too late. This site does that multiplication for you, across all three GPT-6 tiers (Luna, Sol, Astra), side by side.
Every price on this site is copied from the provider's official pricing page and stamped with a verification date. There is no live price feed — and we don't pretend there is. The full policy, including which rate tables the calculator uses and which it deliberately excludes, is published on the Pricing Methodology page.
Independence disclosure: this is an independent cost-estimation tool. It is not affiliated with, sponsored by, or endorsed by OpenAI, Anthropic, or Google. Model names and prices belong to their respective providers — always confirm on the official pricing page before making decisions.
The site started with GPT-6 because that's where the pricing questions are right now. The underlying pricing engine is built provider-agnostic, and the plan is to grow into a general LLM API cost calculator covering more providers as their official prices are verified — one provider at a time, no invented numbers.
Found a price that's out of date, or a calculation that looks wrong? The fastest way to help is to check the methodology page first — it lists every source and the last verified date.