Best AI model for legal work and long documents right now
Updated Oct 24, 2026. Checked daily.
#1 since Oct 23, 2026. No earlier leader is on record.
Tied at the top of LegalBench, with precise reading of dense documents. These picks are readable without an account, and the details behind each one are on the card.
Vals LegalBench 88.5% (top 2 of 150+ models) Source.
Cost
Pro is $20/month. Fable draws on usage credits. API is $10 per million input tokens and $50 per million output.
Free tier
Not on the free plan. Fable needs Pro or higher.
Privacy default
Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Settings, then Privacy. Turn off Help improve Claude. Source
When not to use it
Do not treat it as legal advice, or as a substitute for reading the clause yourself.
Starter prompt
Summarize the obligations, deadlines, and unusual clauses in this contract.
Google AI Pro is $19.99/month. API is $2 per million input tokens until Nov 30, 2026, then $4.
Free tier
Not on the free Gemini plan. Argon needs AI Pro or Ultra.
Privacy default
Yes for adults. Gemini Apps Activity is on by default, and those chats can be used to improve Google AI. Gemini Apps Activity, turn off Keep Activity. Safety review can still apply. Source
When not to use it
Skip it for privileged client files unless your Google account terms allow that use.
Starter prompt
Read this filing and list the risks, the numbers, and anything that changed.
Vals LegalBench 86.2% (top open-weights model on the board) Source.
Cost
Free with limits in the Kimi app. Self-hosting costs whatever hardware you use.
Free tier
Yes, in the Kimi app, with usage limits. Self-hosting has no per-message fee.
Privacy default
Yes. The Kimi consumer policy says prompts and files can be used to improve models. Ask Kimi support to stop training use if the app has no toggle. Source
When not to use it
Skip the hosted Kimi app for client-confidential documents.
Starter prompt
Extract every date, party, and payment term from this document.
Email
One email when a leader changes. Buttondown is the only service that holds the address, and it uses it only to send these alerts. Open and click tracking stay off. Privacy
Coming soon.
Leader history
Oct 23, 2026. Claude Fable 5.1 is the first leader on record. Vals LegalBench 88.5% (top 2 of 150+ models)
A new number one has to show up on two daily checks before it replaces the current leader. Get alerts.
Source: WhichAI.today, Legal leader as of Oct 24, 2026, whichai.today/legal
Questions
Which AI is best for legal & long documents right now?
Claude Fable 5.1 from Anthropic leads, as of Oct 24, 2026. Tied at the top of LegalBench, with precise reading of dense documents. The alternative is Gemini 4 Argon, and the open-weights pick is Kimi K3.
Where do I get Claude Fable 5.1?
Claude app, Pro plan, choose Fable 5.1. Pro is $20/month. Fable draws on usage credits. API is $10 per million input tokens and $50 per million output.
Has this leader changed?
Tracking for this category began on Oct 23, 2026, with Claude Fable 5.1 as the first recorded leader.