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Best LLM for Contract Drafting

Ranked models for drafting, reviewing, and redlining legal contracts and agreements.

#1 Recommendation

gemini-3-pro-preview

Strong on Vals Legal Bench overall_accuracy_pct (99%) and LEXam Leaderboard average_score_pct (76%)

external/google/gemini-3-pro-preview

34.6%

Score

47.4%

Confidence

26

Evidence

Runners-up:#2 gemini-2.5-pro (34.5%)#3 gpt-4.1-20250414 (26.6%)#4 gpt-5-mini-2025-08-07 (25.9%)

Ranked Models

30

Evidence Quality

84%

Scoring

Benchmark-backed

Top Signal

Vals Legal Bench: overall_accuracy_pct

All Ranked Models

Max params:
Min confidence:
30 of 30
RankModelScore
#1gemini-3-pro-preview

Strong on Vals Legal Bench overall_accuracy_pct (99%) and LEXam Leaderboard average_score_pct (76%)

34.6%
#2gemini-2.5-pro

Strong on LEXam Leaderboard average_score_pct (89%) and FACTS Benchmark Suite facts_grounding_score_pct (100%)

34.5%
#3gpt-4.1-20250414

Strong on Vals Case Law v2 overall_accuracy_pct (86%) and Vals Legal Bench overall_accuracy_pct (91%)

26.6%
#4gpt-5-mini-2025-08-07
25.9%
#5gpt-5-2025-08-07
24.4%
#6anthropic/claude-sonnet-4.6
24.3%
#7Grok-4-0709
24.1%
#8google/gemini-3.1-pro-preview
23.2%
#9openai/gpt-5.4-2026-03-05
22.8%
#10gpt-5.1-2025-11-13
22.2%
#11gemini-2.5-flash
21.5%
#12claude-opus-4-5-20251101
20.3%
#13claude-sonnet-4-20250514
20.3%
#14xai-org/grok-4-fast-reasoning
20.0%
#15deepseek/deepseek-r1
19.5%
#16gemini-3-flash-preview
19.2%
#17xai-org/grok-4-1-fast-reasoning
18.7%
#18google/gemini-3.1-flash-lite-preview
18.5%
#19gpt-5.2-2025-12-11
17.8%
#20anthropic/claude-opus-4-6-thinking
17.2%
#21anthropic/claude-opus-4-5-20251101-thinking
16.5%
#22mistralai/mistral-large-2512
16.4%
#24openai/gpt-4.1
16.1%
#25anthropic/claude-sonnet-4-5-20250929-thinking
15.8%
#27Command A (03-2025)
15.0%
#28x-ai/grok-3
14.8%
#29Kimi K2 Thinking
14.8%
#30anthropic/claude-opus-4-1-20250805
14.7%
#31zai/glm-5-thinking
14.0%
#32alibaba/qwen3.5-flash
13.5%

Head-to-Head: #1 vs #2

#1

Top Pick

gemini-3-pro-preview

Strong on Vals Legal Bench overall_accuracy_pct (99%) and LEXam Leaderboard average_score_pct (76%)

34.6%

Conf 47.4%

#2

gemini-2.5-pro

Strong on LEXam Leaderboard average_score_pct (89%) and FACTS Benchmark Suite facts_grounding_score_pct (100%)

34.5%

Conf 51.5%

Full Comparison with Benchmark Evidence →
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