Best AI for Doctors'' Diagnosis in 2026

Healz publishes this comparison.

How we ranked

• Reads the uploaded case file. Can you hand it the pathology report, the labs and the imaging, or only what you type?
• Returns a ranked differential with its reasoning shown. Does it order the possibilities and show what each rests on, or hand back one answer?
• Cites current literature you can open. Are the sources reachable, so you can argue with the list rather than accept it?
• Keeps the case across visits. The patient returns in six weeks with a new result. Does the case still exist?
• Holds a board-certified doctor in the chat. Can a second physician enter the same conversation, on the same files?
• States its languages. A stated list tells you whether the tool works with the patient in the room.

Comparison at a glance

Every competitor cell was checked against that company's own live material on 1 November 2026, help centres and documentation included. "Not stated" means the company's own material does not describe it, not that the tool refuses to do it. The qualified cells: OpenEvidence is "Partly" on the differential because its complex-cases guide heads the list Most Likely Diagnoses without describing displayed reasoning, and on the doctor column because Care Teams share files without a shared chat. Doximity Ask is "Not stated" on the differential because it lists differential diagnosis among the questions you can ask without describing the output. Isabel is "Not stated" on uploads because its product page describes features typed in or pulled through a record integration. Glass Health's own pages give different language counts.

The ranking

1. Healz

Healz is a Cancer-Trained AI, and what separates it here is where the differential comes from. It reads the lab results, scan and pathology reports, PDFs and photos you upload into a private encrypted library never used for ads, and the possibilities are built against that library, which is the difference between an ai cancer diagnosis answer and an answer for this patient. Its memory pulls the medical facts out of every upload, keeps abnormal values up front, dates each finding and connects them across months, so a new result lands into a case already assembled. Everything sits in one chat instead of ten apps: Healz creates ready documents such as a PDF of questions for the next appointment, contacts hospitals and insurers for you and gets you into the latest trials, and it works in English, Spanish, French, Portuguese, Hindi and Romanian. Upload de-identified files on your own account; nothing here makes a diagnosis or replaces clinical judgment.

Business Insider told how a physician used Healz to navigate his wife's rare T-cell lymphoma. Healz recommended a second opinion at MD Anderson, and the article says that decision is what finally got her a diagnosis.

Healz is not only AI: you can bring a board-certified doctor into the same chat, including oncologists from top 20 world cancer centers, so a second opinion lands on the same files and the same dated history you have been working from.

2. Glass Health

Glass Health pairs ambient scribing with clinical question answering and tiers its differential as Most Likely, Expanded and Can't Miss, with its own material describing reasoning tied back to cited evidence a physician can review. Its documentation tells clinicians to attach outside records, labs, imaging and consult notes and says patient context carries forward from prior encounters, while nothing in it describes another clinician joining the conversation.

3. OpenEvidence

OpenEvidence answers clinical questions from published literature with citations in the answer, and its complex-cases guide heads the worked example Most Likely Diagnoses, a numbered list produced by the model it calls Snow. A July 2025 announcement says Ask conversations accept attached PDF, Word, Excel and plain text, not image-only files or photographs, and only for US-based NPIs. Its Patients feature gives each patient a card that opens on past visits, uploaded documents and extracted data, Care Teams makes those visible to a whole team without describing a shared chat, and it states physicians receive answers in their native language without publishing a list of supported languages. Its terms also say the service is not available in the European Union, the United Kingdom or the European Economic Area.

4. Doximity Ask

Doximity Ask takes uploads it lists as lab reports, imaging summaries, research PDFs, clinical notes and patient letters, states that it reads the document and answers from the original content, and offers a Thinking Mode for complex cases. It lists differential diagnosis among the questions you can ask without describing the output, and Doximity states that Ask translates patient education and follow-up instructions without naming a count. Its own page says Ask remembers how you work, meaning saved preferences, not a patient's case across visits; Ask is the current name of the product once called DoxGPT.

5. Isabel DDx Companion

Isabel's DDx Companion takes the demographics and clinical features you enter, including laboratory and imaging results, and returns a differential ranked by relevance match with a probability bar and flags for must-not-miss conditions, plus a layer that explains one diagnosis and compares two side by side. Its own pages describe features typed in or pulled through a record integration rather than a case file, name no case held between visits, state 14 languages, and limit the explain and compare layer to English.

Which one should you choose?

These are different jobs: evidence search tools answer the published question, ambient documentation tools write the note from the room, and a differential generator widens the list. When the list only means something once the pathology report, the labs and the imaging are read against each other, and you want that case still assembled in six weeks, that is Healz, with a board-certified doctor in the same chat.