{"data":{"id":"bb7012a0-dea9-445c-9a62-13335bfd0e6d","title":"Claude Sonnet 5.5","summary":"Anthropic released Claude Sonnet 5.5, which it says runs over 30% faster and costs up to 30% less for most work, priced the same as Sonnet 5. The model is now the free-tier model on claude.ai, while ChatGPT's free tier uses Luna 5.6. Sonnet 5.5 shares a bug with Opus 5.5 where the \"max\" thinking effort ran out of tokens before producing an SVG.","solution":"N/A -- no mitigation discussed in source.","labels":["industry"],"sourceUrl":"https://simonwillison.net/2026/Sep/28/claude-sonnet-5-5/","publishedAt":"2026-09-28T22:07:38.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedVendors":["Anthropic","OpenAI"],"affectedVendorsRaw":["Claude Sonnet 5.5","Claude Sonnet 5","Claude Opus 5.5","Claude Haiku 5.5","ChatGPT","Luna 5.6","GPT-6 Luna"],"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":"2026-09-28T22:07:38.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":null,"llmSpecific":true,"classifierConfidence":0.95,"researchCategory":null,"atlasIds":null}}