tiktoken Undercounts Claude Tokens: 37 of 418 Requests Blew the Limit
This story is from 2026-10-07. It is preserved in the archive; the latest stories are on the live feed.
My nightly digest job died at 2:14 a.m. with a 400 and the message prompt is too long . My packer had measured the prompt at 181,874 tokens, comfortably under the 200K window. Claude said it was 207,431. That's a 14% gap, and it came from one lazy decision I made months earlier: counting Claude tok…
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- 2026-10-07 16:44 · DEV Community — AI
tiktoken Undercounts Claude Tokens: 37 of 418 Requests Blew the Limit