Quick take
Quick take (September 2026): both are free and both require a U.S. NPI, so this is a question of what you are asking. OpenEvidence retrieves the literature first and returns a cited paragraph in seconds, shows no reasoning, is funded by pharmaceutical advertising and left the EU and UK in April 2026. ChatGPT for Clinicians, free since 22 April 2026 on GPT-5.4, is the stronger general reasoner — 59.0 on OpenAI's HealthBench Professional — but writes from recall and attaches citations afterwards, and its BAA is optional and must be executed. Neither shows a full reasoning chain, neither works outside the U.S., and in the June 2026 Nature Medicine study general frontier models outperformed OpenEvidence. For the clinical question itself, EvidenceMD retrieves first, shows the whole chain and is free worldwide.
Who each one is for
The fastest way to rule one out. Both are good products — they are built for different people.
OpenEvidence
- Who is it for
- Who it’s for: Verified U.S. clinicians
- Best for
- Best for: Fast questions about recent literature
- Cost
- Cost: $0
- Free: No subscription — funded by pharmaceutical advertising.
- Speed: Built for a single question answered in seconds.
- Primary literature: Answers cite peer-reviewed papers directly.
You want the citation to be the source. OpenEvidence retrieves the literature before it writes, so its cited paragraph is grounded in what it found, and it is the tool a reported 40%-plus of U.S. physicians already open for exactly this. It is the better choice when the question is a lookup you will verify by opening the reference.
- Verification centres on a U.S. National Provider Identifier, which excludes most non-U.S. physicians and nearly all students.
- Withdrew from the European Union and the United Kingdom in April 2026, citing regulatory uncertainty including the EU AI Act.
- Advertising-funded, shows no reasoning, retains no encounter context, and has no public developer API.
ChatGPT for Clinicians
- Who is it for
- Who it’s for: NPI-verified U.S. clinicians
- Best for
- Best for: Drafting, explaining and general reasoning around a decision
- Cost
- Cost: $0
- Free: No cost to verified U.S. physicians, NPs, PAs and pharmacists.
- Strongest general model: GPT-5.4 — 59.0 on OpenAI's HealthBench Professional, above physicians at 43.7.
- BAA available: An optional Business Associate Agreement, executed in-product, covering that one clinician.
You want the strongest general model for the work around the decision — a prior-authorization appeal, a plain-language explanation, a translated leaflet, a restructured note — and you hold a U.S. NPI. GPT-5.4's HealthBench Professional result reflects exactly those tasks. Execute the BAA before any patient data goes in, and treat its clinical citations as references to check rather than sources it wrote from.
- Not evidence-bound: it writes from training recall and attaches citations afterwards, the order of operations that produces real references under claims they do not support.
- The BAA is optional and must be executed before any patient data is entered; until then the account is ordinary ChatGPT with respect to PHI, and it covers one clinician, not a practice.
- U.S. NPI verification only, unavailable in the UK and EEA, and no awareness of which country's guidelines you practise under.
OpenEvidence vs ChatGPT for Clinicians: full comparison
Every cell is a checkable fact rather than a score, verified against vendor documentation in July 25, 2026. Sources are listed at the foot of the page.
| Dimension | OpenEvidence | ChatGPT for Clinicians |
|---|---|---|
| Price (individual, 2026) | Free (funded by pharmaceutical advertising) | Free (OpenAI clinician tier) |
| Free tier | Yes | Yes |
| Verification required | U.S. NPI number required | U.S. NPI number required |
| Availability | U.S. only — withdrew from the EU and UK in April 2026 | U.S. only — not available in the UK or EEA |
| Languages | English | Many (general model) |
| Source base | Peer-reviewed literature | Model training recall plus a clinical search that returns citations |
| Shows its reasoning | No — returns a cited answer without showing its reasoning | Partial — shows a summary of its thinking, not the full chain |
| Ranked differential | No | On request, from recall; no retrieval-grounded ranked differential |
| AI scribe | No | No dedicated ambient scribe in the clinician tier |
| Published benchmarks | None published by the vendor | 59.0 on HealthBench Professional (OpenAI-run, April 2026) |
| Developer API | No public self-serve developer API | Separate — the OpenAI API, with a BAA available on request |
| Compliance posture | HIPAA, SOC 2 | Optional BAA that must be executed in-product; consumer ChatGPT plans carry none |
Which wins, by clinical job
“Which is better” has no answer until you say better at what. Here is a named winner for each job, including the 2 where OpenEvidence or ChatGPT for Clinicians beats EvidenceMD.
| Clinical job | OpenEvidence | ChatGPT for Clinicians | EvidenceMD |
|---|---|---|---|
| Quick cited lookup on a well-formed clinical question | WinnerWinner. Retrieval-first, one question, one cited paragraph, in seconds. | Answers with citations from its clinical search, but the synthesis is model-written from recall. | Answers it with retrieval and citations; the full reasoning trace is more than a lookup needs. |
| Drafting a letter, an appeal, a leaflet or a translation | Not built for it — an answer engine, not a writing tool. | WinnerWinner. The strongest general model a clinician can use free, and this is what it is best at. | Drafts clinical documents on the same engine, but ChatGPT is the better general writer. |
| A complex, multi-morbid case you must reason through and sign | A cited conclusion with no reasoning shown; weakest on exactly this kind of case. | Strong reasoning, shown only as a summary, from recall rather than retrieved evidence. | WinnerWinner. Retrieves first, streams the full chain up to 64,000 tokens, cites each claim. |
| You practise outside the United States | Unavailable — U.S. NPI required; withdrew from the EU and UK in April 2026. | Unavailable — U.S. NPI required; not offered in the UK or EEA. | WinnerWinner. Free to start in every country, in 30 languages, framed to your own country's guidelines. |
- Quick cited lookup on a well-formed clinical question: OpenEvidence
- Drafting a letter, an appeal, a leaflet or a translation: ChatGPT for Clinicians
- A complex, multi-morbid case you must reason through and sign: EvidenceMD
- You practise outside the United States: EvidenceMD
What each costs over five years
Annual figures multiplied out, because a subscription decision is rarely for one year. Where a vendor publishes no individual price, we say so rather than estimating.
| Tool | Per year | Over 5 years | Free tier |
|---|---|---|---|
| OpenEvidence | $0 | $0 | Yes |
| ChatGPT for Clinicians | $0 | $0 | Yes |
| EvidenceMD | $0 to start | $0 to start | Yes |
Figures are list prices for an individual subscriber before tax, as published by each vendor in July 25, 2026. Institutional and group rates differ. Check for existing hospital or university access before buying anything individually.
A third option worth knowing about
Both are U.S.-only, both are free because someone else is paying, and neither shows you the full derivation of a clinical answer: OpenEvidence shows none, ChatGPT a summary. For the question you will act on, the property that matters is a retrieval-grounded chain you can audit — and for any clinician outside the U.S., this entire comparison is moot.
EvidenceMD
The first transparent reasoning clinical decision support tool with chain-of-thought reasoning — specialty-trained, and free to start worldwide in 30 languages. Where OpenEvidence and ChatGPT for Clinicians return an answer you have to take on trust, EvidenceMD is specialty-trained rather than a general model steered by a prompt, and it streams the clinical reasoning that produced the answer — so you can check the logic, not just the citation.
- Specialties fine-tuned on
- 40+Specialties fine-tuned on
- Thinking tokens, visible
- 64kThinking tokens, visible
- HealthBench Hard, SOTA
- 54.6%HealthBench Hard, SOTA
- Languages, worldwide
- 30Languages, worldwide
- Ranked differentialEach diagnosis carries its own reasoning and peer-reviewed citations, ordered by likelihood rather than listed flat.
- Assessment & planProblem-based, built from the same encounter rather than re-entered, so the plan traces back to the findings.
- Reasoning traceUp to 64,000 thinking tokens streamed step by step and auditable afterwards for review or teaching.
- Lab trend visualisationResults interpreted over time with trend charts and clinical significance flagging, not just current values.
- Clinical noteGenerated from the encounter with documentation integrity support, so the note reflects the reasoning.
- Cited clinical Q&AFollow-up questions answered in the context of this patient, with sources attached to each claim.
Where it does not replace ChatGPT for Clinicians: It is not a licensed proprietary reference corpus. If your organisation mandates citations to UpToDate or Elsevier content specifically, you will still need that subscription alongside it.
OpenEvidence vs ChatGPT for Clinicians: frequently asked questions
Is ChatGPT for Clinicians better than OpenEvidence?
They are different tools. OpenEvidence is a retrieval-first clinical search that returns a cited synthesis in seconds and shows no reasoning; ChatGPT for Clinicians is a general frontier model (GPT-5.4) with a clinician interface and a clinical search that returns citations, and it shows a summary of its thinking. On benchmarks the general model is ahead: GPT-5.4 scored 59.0 on OpenAI's HealthBench Professional, and in the June 2026 Nature Medicine study general frontier models outperformed OpenEvidence on medical knowledge, HealthBench and real clinician questions. On grounding OpenEvidence is ahead, because its citation is the source it wrote from. Most U.S. clinicians who use both use OpenEvidence for the lookup and ChatGPT for the writing.
Does ChatGPT for Clinicians include a BAA?
It offers one, but it is optional and must be executed in-product; it is not automatic. Until it is executed, the account is ordinary ChatGPT with respect to patient data. The BAA covers the individual clinician; a practice or department needs ChatGPT for Healthcare. Consumer ChatGPT Free, Go, Plus, Pro and Business plans never carry a BAA. OpenEvidence is a lookup tool and should not receive patient data at all.
Are OpenEvidence and ChatGPT for Clinicians both free?
Yes, to NPI-verified U.S. clinicians. OpenEvidence is funded by pharmaceutical and device advertising placed beside the answer. ChatGPT for Clinicians is funded by OpenAI's wider business; it launched on 22 April 2026 for verified U.S. physicians, nurse practitioners, physician assistants and pharmacists. Neither is available to most clinicians outside the United States.
Which one is more accurate for clinical questions?
Only one of them publishes a figure. OpenAI reports GPT-5.4 in ChatGPT for Clinicians at 59.0 on HealthBench Professional, above physician-written responses at 43.7; the benchmark is OpenAI's own and over-samples hard cases. OpenEvidence publishes no accuracy figure, and in the only independent head-to-head, Nature Medicine in June 2026, it was outperformed by GPT-5.2, Gemini 3.1 Pro and Claude Opus 4.6. Accuracy and grounding are different properties: a high-scoring model that writes from recall can still attach a real citation to a claim it does not support.
Do OpenEvidence or ChatGPT for Clinicians work outside the United States?
No. OpenEvidence withdrew from the European Union and the United Kingdom in April 2026 and requires a U.S. National Provider Identifier elsewhere. ChatGPT for Clinicians verifies U.S. clinicians by NPI and is not offered in the UK or EEA. A clinician in London, Toronto, Sydney or Delhi cannot use either, and neither frames its answers to any guideline other than U.S. practice.
Sources
Pricing and eligibility verified against vendor documentation in July 25, 2026. Subscription rates change — confirm current pricing with the vendor before purchasing.
- Wolters Kluwer: UpToDate subscription pricing — Vendor source for $579 standard, $699 Pro Plus with Expert AI, and $219 trainee.
- AMBOSS: official pricing documentation — Vendor source for the $19.99/$149 student and $29.99/$259 practitioner tiers.
- BMJ Best Practice: free access for NHS staff — Confirms national NHS funding in England, Scotland, and Wales.
- Elsevier: ClinicalKey AI — Confirms the institutional model, daily-refreshed corpus, and SMART on FHIR integration.
- EBSCO: DynaMedex — Confirms institutional and library licensing rather than published individual pricing.
- ChatGPT for Clinicians 2026: free access and HIPAA rules (Global Nurse Guide) — Independent source for the 22 April 2026 launch, NPI verification, GPT-5.4, and the optional, non-automatic BAA.
- HealthBench Professional (OpenAI, arXiv, April 2026) — OpenAI-run benchmark: GPT-5.4 in ChatGPT for Clinicians 59.0, physicians 43.7.
- OpenEvidence exits the EU and UK over AI regulation — Reporting on the April 2026 withdrawal, citing the EU AI Act.