The best AI models for legal work, ranked by quality with bonus points for large context windows (for contracts and case law), reasoning capabilities (for legal analysis), and structured JSON output (for document automation). Updated hourly from 298+ models.
| # | Model | Score |
|---|---|---|
| 1 | GPT-5.4 ProOpenAI | 91 |
| 2 | GPT-5.2 ProOpenAI | 90 |
| 3 | GPT-5 ProOpenAI | 90 |
| 4 | o3 ProOpenAI | 82 |
| 5 | Claude Opus 4.1Anthropic | 81 |
| 6 | o1-proOpenAI | 77 |
| 7 | o3 Deep ResearchOpenAI | 74 |
| 8 | Claude Opus 4Anthropic | 76 |
| 9 | Claude Opus 4.6Anthropic | 71 |
| 10 | Claude Opus 4.5Anthropic | 70 |
| 11 | GPT-5.4OpenAI | 70 |
| 12 | Claude Sonnet 4.5Anthropic | 69 |
| 13 | GPT-5.2OpenAI | 68 |
| 14 | Gemini 3.1 Pro Preview Custom ToolsGoogle | 68 |
| 15 | Gemini 3.1 Pro PreviewGoogle | 68 |
| 16 | Gemini 3 Pro PreviewGoogle | 68 |
| 17 | Claude Sonnet 4.6Anthropic | 68 |
| 18 | GPT-5.1OpenAI | 67 |
| 19 | GPT-5.3-CodexOpenAI | 67 |
| 20 | GPT-5.2-CodexOpenAI | 67 |
| 21 | GPT-5OpenAI | 67 |
| 22 | Gemini 3 Flash PreviewGoogle | 66 |
| 23 | o4 Mini Deep ResearchOpenAI | 66 |
| 24 | GPT-5.1-Codex-MaxOpenAI | 66 |
| 25 | Gemini 3.1 Flash Lite PreviewGoogle | 66 |
| 26 | Gemini 2.5 ProGoogle | 66 |
| 27 | Gemini 2.5 Flash Lite Preview 09-2025Google | 65 |
| 28 | GPT-5 MiniOpenAI | 65 |
| 29 | Gemini 2.5 Pro Preview 05-06Google | 64 |
| 30 | GPT-5 NanoOpenAI | 64 |
AI models with large context windows (200K+ tokens) can ingest entire contracts, lease agreements, and NDAs in a single prompt. Combined with reasoning capabilities, they identify non-standard clauses, missing provisions, and potential risks — tasks that traditionally take paralegals hours to complete manually.
Models with strong reasoning excel at synthesizing case law, statutes, and regulations. Feed them a legal question with relevant authorities and they can identify precedents, distinguish holdings, and draft research memos — dramatically accelerating the brief-writing process for attorneys.
From demand letters to corporate governance documents, AI models can generate first drafts that follow standard legal formatting. JSON mode enables structured output for template-driven document assembly systems, letting legal teams automate routine filings and correspondence at scale.
Attorney-client privilege and data security are paramount. Open-source models can be self-hosted on-premises, ensuring sensitive client data never leaves your infrastructure. For firms with strict compliance requirements, self-hosted deployment eliminates third-party data processing concerns entirely.