{"updated_at": "2026-10-26T10:12:47Z", "cutoff": "2026-10-26", "report": "https://aiforlawyers.app/report/legal-research", "pdf": "https://aiforlawyers.app/report/legal-research.pdf", "task": "research", "task_label": "Legal research", "note": "Counts are public posts, not a survey. Compare bands and the number of voices, not totals. Outside tests are not our score and are not in this file.", "license": "https://creativecommons.org/licenses/by/4.0/", "attribution": "aiforlawyers.app (AI Vortex), Legal research report, cutoff Oct 26, 2026, https://aiforlawyers.app/report/legal-research", "how_to_cite": "https://aiforlawyers.app/method#use", "min_n": 10, "voices": 1621, "voices_naming_a_tool": 1424, "tools": [{"name": "Perplexity", "status": "rated", "n": 17, "pos": 15, "mixed": 1, "neg": 0, "neutral": 1, "net": 88, "lo": 62, "hi": 94, "confidence": "Low", "complaint_voices": 1, "complaints": [{"pain": "accuracy_other", "count": 1}]}, {"name": "Clio", "status": "rated", "n": 11, "pos": 7, "mixed": 3, "neg": 0, "neutral": 1, "net": 64, "lo": 30, "hi": 80, "confidence": "Low", "complaint_voices": 3, "complaints": [{"pain": "accuracy_other", "count": 2}, {"pain": "price", "count": 1}]}, {"name": "Claude", "status": "rated", "n": 82, "pos": 49, "mixed": 13, "neg": 15, "neutral": 5, "net": 41, "lo": 27, "hi": 54, "confidence": "Medium", "complaint_voices": 28, "complaints": [{"pain": "accuracy_other", "count": 14}, {"pain": "hallucination", "count": 7}, {"pain": "trust_liability", "count": 5}, {"pain": "integration", "count": 2}]}, {"name": "vLex Vincent", "status": "rated", "n": 21, "pos": 15, "mixed": 2, "neg": 3, "neutral": 1, "net": 57, "lo": 26, "hi": 76, "confidence": "Low", "complaint_voices": 5, "complaints": [{"pain": "accuracy_other", "count": 3}, {"pain": "hallucination", "count": 1}, {"pain": "price", "count": 1}]}, {"name": "Gemini", "status": "rated", "n": 31, "pos": 17, "mixed": 9, "neg": 4, "neutral": 1, "net": 42, "lo": 19, "hi": 59, "confidence": "Low", "complaint_voices": 13, "complaints": [{"pain": "hallucination", "count": 6}, {"pain": "accuracy_other", "count": 5}, {"pain": "trust_liability", "count": 1}, {"pain": "privacy", "count": 1}]}, {"name": "CoCounsel", "status": "rated", "n": 168, "pos": 71, "mixed": 41, "neg": 43, "neutral": 13, "net": 17, "lo": 6, "hi": 27, "confidence": "Medium", "complaint_voices": 79, "complaints": [{"pain": "accuracy_other", "count": 41}, {"pain": "hallucination", "count": 16}, {"pain": "price", "count": 16}, {"pain": "trust_liability", "count": 3}, {"pain": "integration", "count": 3}]}, {"name": "Westlaw AI", "status": "rated", "n": 210, "pos": 88, "mixed": 52, "neg": 61, "neutral": 9, "net": 13, "lo": 4, "hi": 22, "confidence": "Medium", "complaint_voices": 109, "complaints": [{"pain": "accuracy_other", "count": 76}, {"pain": "hallucination", "count": 18}, {"pain": "price", "count": 10}, {"pain": "trust_liability", "count": 5}]}, {"name": "Lexis+ AI", "status": "rated", "n": 184, "pos": 59, "mixed": 37, "neg": 78, "neutral": 10, "net": -10, "lo": -21, "hi": 0, "confidence": "Medium", "complaint_voices": 112, "complaints": [{"pain": "accuracy_other", "count": 80}, {"pain": "hallucination", "count": 19}, {"pain": "price", "count": 9}, {"pain": "trust_liability", "count": 3}, {"pain": "integration", "count": 1}]}, {"name": "Harvey", "status": "rated", "n": 56, "pos": 14, "mixed": 13, "neg": 20, "neutral": 9, "net": -11, "lo": -27, "hi": 6, "confidence": "Low", "complaint_voices": 28, "complaints": [{"pain": "hallucination", "count": 11}, {"pain": "accuracy_other", "count": 9}, {"pain": "price", "count": 6}, {"pain": "trust_liability", "count": 2}]}, {"name": "ChatGPT", "status": "rated", "n": 623, "pos": 148, "mixed": 95, "neg": 359, "neutral": 21, "net": -34, "lo": -39, "hi": -28, "confidence": "High", "complaint_voices": 452, "complaints": [{"pain": "hallucination", "count": 297}, {"pain": "accuracy_other", "count": 119}, {"pain": "trust_liability", "count": 27}, {"pain": "privacy", "count": 6}, {"pain": "integration", "count": 3}]}, {"name": "Copilot", "status": "rated", "n": 10, "pos": 3, "mixed": 1, "neg": 6, "neutral": 0, "net": -30, "lo": -66, "hi": 18, "confidence": "Low", "complaint_voices": 7, "complaints": [{"pain": "hallucination", "count": 5}, {"pain": "accuracy_other", "count": 1}, {"pain": "trust_liability", "count": 1}]}, {"name": "Paxton", "status": "few", "n": 6, "pos": 5, "mixed": 1, "neg": 0, "neutral": 0, "net": null, "lo": null, "hi": null, "confidence": null, "complaint_voices": 1, "complaints": [{"pain": "accuracy_other", "count": 1}]}, {"name": "Legora", "status": "few", "n": 4, "pos": 2, "mixed": 1, "neg": 1, "neutral": 0, "net": null, "lo": null, "hi": null, "confidence": null, "complaint_voices": 2, "complaints": [{"pain": "accuracy_other", "count": 2}]}, {"name": "Spellbook", "status": "few", "n": 1, "pos": 1, "mixed": 0, "neg": 0, "neutral": 0, "net": null, "lo": null, "hi": null, "confidence": null, "complaint_voices": 0, "complaints": []}], "outside_tests": [{"name": "Vals Legal AI Report: Legal Research (VLAIR Legal Research)", "published": "2025-10-14", "read": "2026-10-22", "url": "https://www.vals.ai/industry-reports/vlair-10-14-25"}, {"name": "Vals Legal Research Bench (agentic US legal research leaderboard)", "published": "2026-10-22 (page shows Updated 10/22/2026)", "read": "2026-10-22", "url": "https://www.vals.ai/benchmarks/legal_research"}, {"name": "Hallucination-Free? Assessing the Reliability of Leading AI Legal Research Tools (Magesh et al.)", "published": "2024-05-30 (arXiv v1; HAI news post dated 2024-05-23)", "read": "2026-10-22", "url": "https://arxiv.org/abs/2405.20362"}, {"name": "LegalBench-RAG (Pipitone and Houir Alami)", "published": "2024-08-19", "read": "2026-10-22", "url": "https://arxiv.org/abs/2408.10343"}, {"name": "Vals CaseLaw (Canadian court case Q&A, archived)", "published": "2026-05-04 (page shows Updated 5/4/2026)", "read": "2026-10-22", "url": "https://www.vals.ai/benchmarks/case_law_v2"}]}