{"data":{"id":"eff3bf60-4058-48ec-9b30-1a82ea484159","title":"Claude Sonnet 5 with Cursor: strong reasoning, throttled by the harness | Endor Labs","summary":"Endor Labs re-ran Claude Sonnet 5 on its Agent Security League paired with Cursor, where it scored 63.1% FuncPass and 15.6% SecPass, well behind Claude Code's 83.2% and 19.6%. The authors attribute the gap mainly to Cursor timing out on this model far more often, with 65 of 200 tasks timing out versus 20 for Claude Code, rather than to weaker reasoning.","solution":"N/A -- no mitigation discussed in source.","labels":["research","industry"],"sourceUrl":"https://www.endorlabs.com/learn/claude-sonnet-5-with-cursor-strong-reasoning-throttled-by-the-harness","publishedAt":"2026-10-12T15:59:35.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Claude Sonnet 5","Claude Code","Cursor","Claude Sonnet 5 with Cursor","Fable 5","Opus 4.6","Opus 4.7","GPT-5.5"],"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":"2026-10-12T15:59:35.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}