How

AI Tools for Legal Research and Case Analysis

Vendor pages document different plan prices, research features, upload limits, data controls, and review rules for ChatGPT, Claude, and Gemini, but do not establish accuracy on a specific legal matter.

Sources checked 2 Oct 2026

For AI tools for legal research and case analysis, the vendors’ own pages document different research features, upload limits, prices, data settings, and review rules. They do not establish whether an assistant finds the right authority, cites it accurately, or reasons persuasively on your matter. Chat Picker has not tested ChatGPT, Claude, or Gemini for legal work and does not declare a winner.

What the vendors document

Treat the documentation as a map of availability and constraints, not as evidence of legal-work quality.

Plans. OpenAI's ChatGPT pricing page lists Plus at $20 per month with monthly billing. Anthropic's Claude pricing page lists Pro at $20 per month monthly or $17 per month annually, with $200 due up front. Google's US AI plans page lists Google AI Pro at $19.99 per month. These figures are as read on October 1, 2026. The pages do not provide a comparable per-query price for legal work.
Heavier use. OpenAI's Pro tiers Help Center lists monthly tiers at $100, $200, and $500. Anthropic's Claude pricing page says Max starts at $100 per month for 5x or 20x Pro usage but shows no numeric price for the 20x option. Google's US AI plans page lists Ultra at $99.99 or $199.99 per month. These figures are as read on October 1, 2026.
Documents. OpenAI's File Uploads FAQ gives every uploaded file a 512 MB hard limit and allows Free users 3 uploads per day. Claude's upload help sets chat uploads at 500 MB per file; PDFs of 100 pages or fewer receive text and visual analysis, while PDFs from 101 to 1000 pages are text-only. Gemini's file-upload help allows up to 10 files in one prompt and up to 100 MB per nonvideo file, subject to availability. These figures are as read on October 1, 2026.
Research. OpenAI's Deep Research help says completed outputs include citations or source links and can use uploaded files, the public web, or selected sites. Claude's Research help makes Research available to paid Pro, Max, Team, and Enterprise users, requires web search, and describes multiple connected searches. Gemini's Deep Research help says Google Search is included by default but can be deselected, with other sources added.
Data controls. OpenAI's pricing page says an opt-out is available on Free, Go, Plus, and Pro, while OpenAI's File Uploads FAQ says uploaded files follow the chat's retention period. Anthropic's Claude pricing page says the opt-out applies to Free, Pro, and Max, while Team is not trained on by default. The Gemini plans page states no chat-training setting, so Chat Picker marks it “Not verified.” Google says Keep Activity must be on for Drive file access and for finding past Deep Research reports.
Accuracy. OpenAI's accuracy guidance says ChatGPT can be wrong and sound confident when wrong, so important quotations, data, and references need verification. Claude's incorrect-response guidance warns of misleading answers and convincing quotations not grounded in fact. Gemini's policy says outputs reflect training-data limits and probabilistic generation. Its Sources help says a Sources panel may expose links, but their presence does not establish support for every sentence.

For legal boundaries, OpenAI's Usage Policies prohibit tailored advice requiring a license, including legal advice, without involvement by a licensed professional. They also prohibit automated high-stakes decisions in sensitive areas without human review. Anthropic's Usage Policy classifies legal interpretation, legal guidance, and decisions with legal implications as high-risk. It calls for qualified professional review before covered advice is disseminated or finalized and requires AI disclosure at the beginning of consumer-facing sessions. The Gemini policy page does not name legal research as a specific category.

What the documentation cannot tell you

The documentation cannot tell you whether a search missed contrary authority, a quotation supports the stated proposition, the jurisdiction is current, or an analysis preserves every legal qualifier. Context windows and file caps describe capacity boundaries; they do not prove retrieval quality, legal reasoning, speed, or reliability.

Chat Picker has no quality tests, scores, or rankings of its own. Use the documentation to identify plans and constraints, then test the shortlisted services on work you are authorized to use.

How to check it yourself

Regulation search. Give every assistant the same prompt: “Find the primary authority currently in force for workplace-injury recordkeeping in the United States. Identify each jurisdiction covered, state its effective date, quote the operative language, link to the official source, and distinguish binding authority from commentary.” Check source type, quotation support, and dates. Record every miss or unsupported statement.
Case analysis. Attach an opinion you may use and ask: “Extract the procedural history, issue, holding, and limiting language. Quote each proposition and cite the PDF page shown in the viewer.” Look for invented cases, wrong pages, omitted qualifiers, and statements that outrun the holding. Write down what needs correction.
Reasoning trace. Supply fixed facts and excerpts, then ask: “Map each element to supporting or contrary language. Separate the holding from dicta and list unresolved questions.” Follow each step back to the supplied text and record unsupported inferences or dropped facts.
Cost and scale. Run the same mix of search, upload, citation-checking, and revision tasks. Record the plan, any displayed usage-counter change, elapsed time, retries, and accepted outputs. Calculate cost per accepted task only after collecting your own figures.
Privacy and compliance. Use a synthetic file and ask: “Identify personal or sensitive data, propose a redaction checklist, and do not infer facts about any person.” Inspect permissions, training controls, and retention screens before introducing real material. Record what each interface actually shows.
Experience and versioning. Give associates the same task. Record the time and friction involved in finding source controls, uploading a file, checking a citation, and exporting work. Save the date, plan, displayed model label, and feature settings. One pass is not a general benchmark.

Which rows of the comparison matter

In the ChatGPT, Claude, and Gemini comparison matrix, prioritize Free plan, Main paid plan, Heavy-use plans, Team plan, Context window in the app, How usage limits are described, Training on your chats, and Ads.

Treat these as purchasing filters, not quality evidence. Each figure carries its vendor source and read date, while an unconfirmed entry is marked “Not verified” and left blank. Prices are in US dollars unless a cell says otherwise; confirm the vendor price before subscribing.