Best LLM for Legal
Drafting contracts, summarising case law, reviewing agreements, and assisting legal research.
Get started freeLegal applications demand precision above all else - a poorly worded clause or missed risk can have significant financial and legal consequences. The best legal LLMs combine large context windows for full-document review with careful, disclaimer-aware output and the ability to identify ambiguous or missing language.
What to look for in a Legal LLM
- 1Precision and accuracy in legal language
- 2Ability to identify risks and ambiguous clauses
- 3Appropriate caveats and professional disclaimers
- 4Handling long documents within context window
Top 4 AI Models for Legal
Ranked by performance on legal tasks
Claude 4 Opus
The flagship model, focused on deep reasoning, large-scale coding and sustained multi-step agentic workflows.
Compare with top pickGPT-5.5
OpenAI's smartest and most capable model yet for agentic coding, knowledge work, and computer use, delivering a new class of intelligence at GPT-5.4 latency.
Compare with top pickGPT-5.4
OpenAI's frontier model for complex professional work with best intelligence at scale for agentic, coding, and professional workflows.
Compare with top pickClaude 4 Sonnet
A balanced-hybrid reasoning model tuned for everyday assistant and high-volume tasks.
Compare with top pickLegal Model Comparisons
Head-to-head comparisons filtered for legal performance
GPT-5.5 vs GPT-5.4
for Legal
GPT-5.5 vs GPT-5.2
for Legal
GPT-5.5 vs GPT-5.1
for Legal
GPT-5.5 vs GPT-5.3 Codex
for Legal
GPT-5.5 vs GPT-5.2 Codex
for Legal
GPT-5.5 vs GPT-5.1 Codex
for Legal
GPT-5.5 vs Sora 2
for Legal
GPT-5.5 vs Sora 2 Pro
for Legal
GPT-5.5 vs GPT-5
for Legal
GPT-5.5 vs GPT-5 Codex
for Legal
GPT-5.5 vs GPT-5 Mini
for Legal
GPT-5.5 vs GPT-5 Nano
for Legal
GPT-5.5 vs GPT-5 Pro
for Legal
GPT-5.5 vs GPT-4.1
for Legal
GPT-5.5 vs GPT-4.1 Mini
for Legal
GPT-5.5 vs GPT-4.1 Nano
for Legal
GPT-5.5 vs GPT-OSS 120B
for Legal
GPT-5.5 vs GPT-OSS 20B
for Legal
GPT-5.5 vs GPT Image 1.5
for Legal
GPT-5.5 vs GPT Image 1
for Legal
GPT-5.5 vs GPT Image 1 Mini
for Legal
GPT-5.5 vs o4-mini
for Legal
GPT-5.5 vs o3
for Legal
GPT-5.5 vs o3-mini
for Legal
GPT-5.5 vs o1
for Legal
GPT-5.5 vs o1-pro
for Legal
GPT-5.5 vs GPT-4o
for Legal
GPT-5.5 vs GPT-4o mini
for Legal
GPT-5.5 vs GPT-4o Audio
for Legal
GPT-5.5 vs GPT-4o mini Audio
for Legal
GPT-5.5 vs GPT-4 Turbo
for Legal
GPT-5.5 vs GPT-3.5 Turbo
for Legal
GPT-5.5 vs Gemini 3.1 Pro
for Legal
GPT-5.5 vs Nano Banana 2
for Legal
GPT-5.5 vs Gemini 3 Pro
for Legal
GPT-5.5 vs Nano Banana Pro
for Legal
GPT-5.5 vs Gemini 2.5 Pro Experimental
for Legal
GPT-5.5 vs Gemini 2.5 Flash
for Legal
GPT-5.5 vs Nano Banana
for Legal
GPT-5.5 vs Gemini 1.5 Pro
for Legal
GPT-5.5 vs Gemini 1.5 Flash
for Legal
GPT-5.5 vs Gemini 1.0 Pro
for Legal
GPT-5.5 vs Claude 4.7 Opus
for Legal
GPT-5.5 vs Claude 4.6 Sonnet
for Legal
GPT-5.5 vs Claude 4.5 Sonnet
for Legal
GPT-5.5 vs Claude 4.5 Haiku
for Legal
GPT-5.5 vs Claude 4.6 Opus
for Legal
GPT-5.5 vs Claude 4.5 Opus
for Legal
GPT-5.5 vs Claude 4.1 Opus
for Legal
GPT-5.5 vs Claude 4 Sonnet
for Legal
GPT-5.5 vs Claude 4 Opus
for Legal
GPT-5.5 vs Claude 3.5 Sonnet
for Legal
GPT-5.5 vs Claude 3.5 Haiku
for Legal
GPT-5.5 vs Claude 3 Opus
for Legal
GPT-5.5 vs Claude 3 Sonnet
for Legal
GPT-5.5 vs Claude 3 Haiku
for Legal
GPT-5.5 vs Grok 4
for Legal
GPT-5.5 vs Grok 3
for Legal
GPT-5.5 vs Grok 3 Mini
for Legal
GPT-5.5 vs Qwen3-Max
for Legal
Found your model? Now build a legal tool that actually works.
Knowing which LLM is best for legal is step one. Step two is shipping a tool your team actually uses - not copy-pasting the same prompt into ChatGPT every day.
- Powered by Claude 4 Opus - swap any time
- No coding. Live in minutes.
- Share with your team - one tool, everyone aligned
Frequently asked questions about Legal LLMs
Which LLM is best for legal work in 2026?
Claude 4 Opus and GPT-5.5 are the top legal LLMs in 2026. Claude 4 Opus excels at identifying ambiguous clauses, drafting precise contract language, and handling nuanced legal reasoning with appropriate disclaimers. GPT-5.5 is preferred for structured document output and legal research synthesis. Both offer the large context windows needed for full contract review.
Can an LLM reliably review contracts?
Yes, for initial review and risk flagging. LLMs like Claude 4 Opus can identify missing clauses, unusual terms, one-sided language, and common risks in standard commercial contracts with high accuracy. However, they should supplement - not replace - qualified legal review. Use LLMs to accelerate the review process and surface issues for a solicitor or in-house counsel to validate.
Which AI model is best for legal research and case law summarisation?
GPT-5.5 and Gemini 2.5 Pro are strongest for legal research tasks. GPT-5.5 synthesises multiple sources clearly and produces well-structured research memos. Gemini 2.5 Pro handles very long source documents effectively. For case law summarisation, Claude 4 Opus captures legal nuance better and is less likely to oversimplify complex holdings.
Is it safe to use an LLM for legal documents?
With proper safeguards, yes. LLMs should be used for drafting, reviewing, and researching - not for delivering final legal advice to clients. Always have a qualified lawyer review LLM-generated legal content before use. Use RAG to ground the model in your jurisdiction's statutes and precedents rather than relying on general training data, which may be out of date.
What context window do I need for full contract or document review?
A standard NDA or service agreement fits in 8K–32K tokens. A full enterprise software licence, M&A agreement, or lengthy employment contract may require 100K–500K tokens. Claude 4 Opus and Gemini 2.5 Pro both offer 1M token context windows, making them the best choices for reviewing lengthy or multi-document legal packages in a single pass.