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Release: ttok 1.0 Simon Willison’s Weblog Newsletter 9th October 2026 Release ttok 1.0 — Count and truncate text based on tokens I released ttok 0.4, ran uv tool upgrade ttok, piped a file into the new version... and realized that it was defaulting to the GPT-4 tokenizer when it should very clearly default to GPT-5/GPT-6 instead! I figured switching the default was a reasonable excuse to finally ship a 1.0. OpenAI haven't actually confirmed that GPT-6 uses the same tokenizer as the GPT-5 family yet - there's an angry issue about it - but I found this commit by William Liu which reports on an experiment he ran confirming that the tokenizers are likely the same: All seven GPT models (5.5, 5.6 Sol/Terra/Luna, 6 Astra/Sol/Luna) report 44,794 tokens and match each other on every one of the 31 fixtures. GPT-6 introduces no input-count change on this corpus. Recent articles Claude Haiku 5.5 - 7th October 2026 We're going to need default hard budget caps on pretty much everything - 3rd October 2026 OpenAI DevDay 2026 live blog - 29th September 2026 This is a beat by Simon Willison, posted on 9th October 2026. projects 556 ai 2,271 openai 474 generative-ai 2,013 llms 1,979 tokenization 15 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026