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7 days · 15 to 40 minutes a day

Seven real tasks, with every citation checked

The problem with legal AI is not that it does not know: it is that nobody tells you what to ask for. Here are seven law-firm tasks, with the exact text to give it and the deliverable that comes out. Start on the free plan, no card required.
Start the challenge freeConnect to Claude or ChatGPT
01

Connect Lexiel where you already work

In Claude or ChatGPT as a connector, or straight in the app. Done once, in a couple of minutes.

02

Do the day's task

Each challenge comes with the exact text to paste and the matter to work on. You can use a real one of yours.

03

Keep the deliverable

You finish with something usable: a citation report, a selection of rulings or a reviewed brief.

If you use a real matter, anonymise it first: no names, ID numbers or case numbers. Lexiel neutralises personal data in the documents you upload, but professional secrecy comes before any tool.

The seven tasks

Deliberately chosen around what a case-law search engine cannot do: check other people's citations, Constitutional Court, Court of Justice of the EU and procedural admissibility.

Day 120-30 min

Audit the other side's brief

The reply you just received cites six judgments and eleven articles. With generalist AI in the mix, the odds that one of those citations does not exist stopped being theoretical.

Paste this

“Audit every citation in this brief: tell me which are confirmed against CENDOJ and the BOE, which you could not confirm and which have an invalid format.”

Deliverable:
A citation report with the status of each one, ready for your submission.
Why here:
A search engine brings you rulings. This does the opposite: it takes the other side's citations and checks them one by one.
Day 215-25 min

Verify your own citations before filing

The risk is not only theirs. A mistyped ECLI, or a judgment the AI composed from memory, reaches the court with your signature under it.

Paste this

“Before I file this brief, verify every judgment and article I cite. Explicitly flag anything you cannot confirm against the official source.”

Deliverable:
Your brief with every citation confirmed, or flagged as unconfirmed, before the judge sees it.
Why here:
We distinguish "valid format" from "it exists". Two different things, and only one saves you.
Day 325-35 min

Find the judgment that holds up your case

Any nice-sounding judgment will not do: you need the one that mirrors your facts. Citing five rulings versus citing the right five is the case itself.

Paste this

“Search Supreme Court and Provincial Court case law on these facts, keep the closest ones and tell me, for each, why it fits and its ECLI.”

Deliverable:
A short list of applicable rulings, each with its verifiable ECLI.
Why here:
Every result comes from the verified corpus and arrives with its identifier so you can check it yourself.
Day 425-35 min

The constitutional argument CENDOJ will not give you

Constitutional Court doctrine decides amparo appeals, fundamental-rights breaches and constitutionality questions. And it is not in CENDOJ.

Paste this

“Search Constitutional Court doctrine on this fundamental right and give me the applicable judgments with their reference, to ground the argument.”

Deliverable:
The constitutional ground of your appeal, supported by traceable Constitutional Court doctrine.
Why here:
Tools that only read CENDOJ are completely blind here: the Constitutional Court publishes in its own system.
Day 525-35 min

EU law, with the ECLI checked against EUR-Lex

Unfair terms, consumers, data protection, competition. In half of Spain the decisive argument came from the Court of Justice of the European Union.

Paste this

“Find the CJEU case law applicable to this matter and check every European ECLI before I cite it in the brief.”

Deliverable:
Your EU-law argument with its rulings verified against EUR-Lex.
Why here:
A European ECLI cannot be checked in CENDOJ. We check it against EUR-Lex, where it actually lives.
Day 615-25 min

Is your claim admissible? LO 1/2025 changed the rules

Since April 2025, filing without attempting an ADR method can get your claim dismissed. Add the procedure-by-amount rule and the court naming, which also changed.

Paste this

“Check whether this claim complies with LO 1/2025: the ADR prerequisite, the procedure-by-amount rule and the court naming. Cite the rule for each finding.”

Deliverable:
A pre-filing checklist, with the exact rule behind each point.
Why here:
Deterministic rules, not a model opinion: every finding cites the article behind it.
Day 730-40 min

Put it together: the finished appeal

Last day. Take a real matter from your desk and chain the six previous steps: search, select, draft, verify and check admissibility before signing.

Paste this

“Draft the appeal with grounds supported by the case law we selected and, when done, audit every citation in the text you just wrote.”

Deliverable:
A complete brief whose citations passed the same filter you would apply by hand, in a fraction of the time.
Why here:
The step almost nobody takes: verifying what the AI itself just wrote, before signing it.

What you need to start

The free plan is enough for the first challenges

No card, 25 queries a day: verify citations, audit short briefs and search case law and legislation.

A matter to work on

Preferably one of yours, anonymised. If you would rather not use a real one, each challenge works with a made-up scenario.

Claude, ChatGPT or the app itself

The connector installs by copying an address. If you would rather not touch settings, do the challenges inside Lexiel.

Between 15 and 40 minutes a day

These are work tasks, not classroom exercises: the time you put in comes back in the deliverable.

Start with Day 1

Take the last reply you received and check its citations. It is the shortest challenge and the one that surprises the most.

Start free, no cardSee the plans

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7-day challenge: litigate with verified AI | Lexiel.ai