25 real-world LLM system case studies

A WhatsApp bot that answers questions, looks up orders, and knows when to call a human.

Classify thousands of tickets a day by queue, priority, and product.

Handle live calls with response time under one second.

An agent that reads the repo, edits files, runs tests, and opens a PR.

Comment on PRs with real findings and few false positives.

Generate tests that compile, pass, and catch real bugs.

Migrate hundreds of files off an old framework over several days.

Investigate alerts, read logs, and suggest the likely cause before the human wakes up.

Read invoices and contracts in PDF and fill the ERP with no manual typing.

Answer employee questions from wikis, policies, and manuals.

Investigate an open question across dozens of sources and deliver a cited report.

Answer spreadsheet questions by writing and running code, not by guessing numbers.

Let business teams query the database without knowing SQL and without risk of damage.

Research leads, write the first message, and book a meeting.

Review contracts, flag risky clauses, and cite the legal basis.

Pre-screen candidates in an explainable, auditable way.

Moderate text and images at scale with a clear policy and low cost.

Read statements, suggest payments, and schedule Pix transfers only with explicit confirmation.

Sign up customers over WhatsApp, collect documents, and resume days later.

Understand running shoes for rainy days and find the right product in milliseconds.

A tutor that remembers the student, adapts exercises, and never just hands over the answer.

Fetch duplicate bills, download invoices, and fill portals that have no API.

From brief to published post, with research, draft, review, and brand check.

Answer patient questions without diagnosing and knowing when to refer to a doctor.

Reconcile payments, issue invoices, and collect from customers in processes that last days.