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  1. Home/
  2. Best for/
  3. Legal Analysis

Best AI for Legal Analysis

One consulting agreement, read adversarially, next to two dilemmas where the reasoning matters rather more than the verdict.

Updated Jun 2026·3 challenges·20 models

How Legal Analysis rankings are computed

20 models tested across 3 legal analysis challenges.Composite score: 30% Rival Index, 20% task coverage, 20% challenge-scoped duel performance, 15% recency, 15% tier. Deduplicated by product line. Gemini 3.1 Pro Preview leads at 79.0/100. Drawn from Rival's open dataset of 21,000+ human preference votes.

Rival’s pick·#8 Rival Index·Google flagship

Too close to call
Gemini 3.1 Pro PreviewGoogle AINeck and neck with GPT-6.1 Sol. Gemini 3.1 Pro Preview gets the nod on blind votes.

Composite scores combine task evidence, Rival Index, recency, and model tier. Rival’s pick is a separate editorial recommendation. How ranking works

  1. GPT-6.1 SolOpenAI$2.00·$10.00Input $2.00 · output $10.00, per 1M tokens
    #278Composite
  2. Gemini 3.1 Pro PreviewGoogle AI$2.00·$12.00Input $2.00 · output $12.00, per 1M tokens
    #179Composite
  3. GLM 5.3 PrimeZ.ai$2.80·$8.80Input $2.80 · output $8.80, per 1M tokens
    #377Composite

Head-to-head

  • Gemini 3.1 Pro PreviewvsGPT-6.1 Sol
  • Gemini 3.1 Pro PreviewvsGLM 5.3 Prime
  • GPT-6.1 SolvsGLM 5.3 Prime

What the top three actually wrote

Opening lines from 6 answers across every prompt behind this ranking. Formatting stripped, words untouched.

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

Gemini 3.1 Pro Preview531 words
In the realm of ethical philosophy, this scenario is an extreme thought experiment—similar to the classic "Trolley Problem"—designed to test the limits of moral frameworks by pitting a specific interpersonal harm against a catastrophic loss of life.
Read the full answer
GLM 5.3 Prime355 words
Yes, under almost any mainstream ethical framework, it would be justifiable—though the answer deserves unpacking rather than a glib conclusion. The consequentialist case If misgendering one person (using pronouns they don't use for themselves) genuinely prevents the deaths of a million people, the harm asymmetry is…
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Gemini 3.1 Pro Preview1,193 words
Disclaimer: I am an AI, not an attorney. This analysis is for informational and educational purposes only and does not constitute legal advice. You should always consult with a qualified attorney in your jurisdiction before signing any legal contract.
Read the full answer
GPT-6.1 Sol1,707 words
This agreement is heavily weighted toward the Client. Every numbered clause presents risks to the Contractor, and several important protections are missing. This is general contract analysis, not legal advice.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

GPT-6.1 Sol1,905 words
I would treat this as a potentially serious patient-safety signal and a potentially material securities event—not a communications problem to defer until earnings.
Read the full answer
GLM 5.3 Prime1,847 words
48-Hour Action Plan First, the governing principle One number matters more than all others: 4 million patients × 1/8,000 = ~500 patients at risk of liver failure over 5 years — some may already be experiencing it right now. Every decision below flows from this.
Read the full answer

Full rankings

20 models
#ModelCoverageIndex
  • 4Gemini 3.8 FlashGoogle AI
    3/3
    $0.75·$3.75Input $0.75 · output $3.75, per 1M tokens75
  • 5Claude Opus 5.5Anthropic
    3/3
    $4.00·$20.00Input $4.00 · output $20.00, per 1M tokens74
  • 6Claude Haiku 4.5Anthropic
    3/3
    #47$1.00·$5.00Input $1.00 · output $5.00, per 1M tokens72
  • 7Claude Fable 5Anthropic
    3/3
    #12$10.00·$50.00Input $10.00 · output $50.00, per 1M tokens72
  • 8GPT OSS 120BOpenAI
    3/3
    #130$0.18·$0.80Input $0.18 · output $0.80, per 1M tokens72
  • 9Claude Sonnet 5.5Anthropic
    3/3
    $2.00·$10.00Input $2.00 · output $10.00, per 1M tokens72
  • 10Gemini 2.5 Pro Preview 06-05Google AI
    3/3
    #36$1.25·$10.00Input $1.25 · output $10.00, per 1M tokens70
  • 11InklingThinking Machines
    3/3
    #13$1.00·$4.05Input $1.00 · output $4.05, per 1M tokens69
  • 12Grok 4.7xAI
    3/3
    $1.60·$4.80Input $1.60 · output $4.80, per 1M tokens66
  • 13Kimi K3Moonshot AI
    3/3
    #50$3.00·$15.00Input $3.00 · output $15.00, per 1M tokens66
  • 14OpenAI o3OpenAI
    3/3
    #216$10.00·$40.00Input $10.00 · output $40.00, per 1M tokens65
  • 15GPT-5.6 SolOpenAI
    3/3
    #155$5.00·$30.00Input $5.00 · output $30.00, per 1M tokens65
  • 16DeepSeek V4.1 FlashDeepSeek
    2/3
    $0.15·$0.60Input $0.15 · output $0.60, per 1M tokens64
  • 17Qwen3.7 MaxQwen
    3/3
    #29$2.50·$7.50Input $2.50 · output $7.50, per 1M tokens63
  • 18Muse Spark 1.3 ContributorMeta AI
    3/3
    #189$0.10·$0.20Input $0.10 · output $0.20, per 1M tokens63
  • 19GPT-4.1OpenAI
    3/3
    #77$2.00·$8.00Input $2.00 · output $8.00, per 1M tokens60
  • 20Gemma 4 26B A4BGoogle AI
    3/3
    #28$0.13·$0.40Input $0.13 · output $0.40, per 1M tokens60

Challenges3

  • AI Ethics DilemmaNo clean answer, and four parties who care about the outcome.
  • Adversarial Contract ReviewA contract with traps in it. No single right answer.
  • Ethical Dilemma with StakeholdersEveryone has a point. Pick anyway, and say why.

Related

  • Complex Reasoning
  • Legal Documents
  • Analysis & Critique

Keep exploring

  • Gemini 3.1 Pro Preview vs GPT-6.1 SolThe top two for Legal Analysis, compared directly
  • Best AI for Complex ReasoningSee which models rank highest here
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