{"data":{"id":"ea2659af-96ee-4ef7-ab8a-5584a36881cc","title":"ttok 1.0","summary":"The author released ttok 1.0 after discovering that ttok 0.4 defaulted to the GPT-4 tokenizer, and changed the default to the GPT-5/GPT-6 tokenizer. OpenAI has not confirmed that GPT-6 uses the same tokenizer as the GPT-5 family, but a commit by William Liu reports an experiment in which all seven GPT models tested reported 44,794 tokens and matched on all 31 fixtures.","solution":"N/A -- no mitigation discussed in source.","labels":["industry","research"],"sourceUrl":"https://simonwillison.net/2026/Oct/9/ttok/","publishedAt":"2026-10-09T00:34:43.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["OpenAI"],"affectedVendorsRaw":["OpenAI","GPT-4","GPT-5","GPT-6","ttok"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-10-09T00:34:43.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":null,"llmSpecific":true,"classifierConfidence":0.8,"researchCategory":null,"atlasIds":null}}