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Count tokens before you call OpenAI or Claude: the count tokens APIs in Next.js

You want to know how many tokens a request will use before you send it: to check it fits the model's context window, to estimate what it will cost, or to stop one user's pasted document from running up a bill. Both OpenAI and Anthropic now have an API endpoint that counts input tokens for the exact…

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  1. 2026-11-06 14:08 · DEV Community — AI
    Count tokens before you call OpenAI or Claude: the count tokens APIs in Next.js

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