# Resend Cost

Resend Cost reads a real production trace — an exported ChatGPT or Claude conversation, an API request log, or a CSV of calls — and reports its cost at public API list prices. It shows the input represented by re-sending the same history on every turn, what prompt caching would have saved or wasted on that exact prefix, how much of the bill is output and reasoning tokens, and what each fix is worth in dollars against your own numbers. It also audits Claude Code agent retries and locates the first prompt-cache prefix divergence. Everything is computed in the browser and the trace never leaves the device.

Contact: support@resendcost.com
Canonical: https://resendcost.com/

- [Resend Cost — price your LLM run from its real trace](https://resendcost.com/) — Drop or paste a ChatGPT or Claude export, API log or call CSV. Price the re-send curve, caching and concrete fixes locally at public API rates.
- [Why conversation cost grows faster than the conversation does](https://resendcost.com/re-send/) — A stateless API client may re-send the whole history. See why full-history billed input reaches 9.7x–11.4x the visible transcript.
- [Prompt caching cost — the cache write every calculator leaves out](https://resendcost.com/prompt-caching/) — Find the first prompt-cache prefix divergence in a local trace, price the missed-cache dollars and calculate break-even reads with writes included.
- [Claude token cost — audit one Claude Code session locally](https://resendcost.com/claude-token-cost/) — Drop a Claude Code session JSONL. Price provider-reported tokens, exact repeated tool attempts, recovery work and suspected loops locally without an upload.
- [About Resend Cost — what is exact, what is estimated, and why](https://resendcost.com/about/) — OpenAI counts are local; Claude and Gemini are exact only with provider usage data. See what is estimated and where rates came from.
- [Privacy — Resend Cost](https://resendcost.com/privacy/) — Your trace is read in the browser tab and never sent anywhere. What the cookieless analytics records, which is two counts and nothing about your file.
- [Terms — Resend Cost](https://resendcost.com/terms/) — Terms of use for Resend Cost, including the limits of a cost estimate and how the price table ages.