Five clinical AI tools now compete for working doctors' daily use. Each has a different trust model, a different business model, and a different answer to "why should a clinician trust this output?"
The Five Contenders at a Glance
ChatGPT for Clinicians (OpenAI). Free. GPT-5. Launched 22 April 2026. US-first. Strongest underlying model, broadest capability. No peer-review layer, no EHR integration, no UK guidelines.
OpenEvidence. Free (pharma ad-funded). $12B valuation. Proprietary models on peer-reviewed literature only. 757,000+ clinicians. Epic-embedded (Mount Sinai, Sutter Health). Strongest EHR integration and source control.
UpToDate (Wolters Kluwer). $500+/yr. 7,600+ expert authors. 30-year incumbent. Expert AI (GenAI on curated content, 70% enterprise adoption). Microsoft partnership (Dragon Copilot integration). Deepest expert-curated content.
Doximity DoxGPT. Free (Doximity membership free). PeerCheck (10,000+ physician reviewers, Eric Topol, Regina Benjamin). 3,200+ drug monographs. Integrated AI Scribe. 85% of US doctors on platform.
iatroX. Free (core). MHRA-registered, UKCA-marked. NICE/CKS/literature/SmPC citations. 15+ exam Q-banks. 80+ calculators. CPD tools. Only MHRA-registered clinical AI for individual clinicians.
The Comparison Matrix
| Dimension | ChatGPT Clinicians | OpenEvidence | UpToDate | DoxGPT | iatroX |
|---|---|---|---|---|---|
| Price | Free | Free (ad-funded) | $500+/yr | Free | Free (core) |
| Citations | Peer-reviewed | Peer-reviewed only | Expert-curated | PeerCheck-verified | NICE/CKS/SmPC |
| Trust model | Model benchmarks | Source control | Expert curation | Physician review | MHRA registration |
| UK guidelines | No | No | No | No | Yes |
| EHR integration | No | Yes (Epic) | Yes (Dragon/EHRs) | No | No |
| Drug info | Generated | Generated | Expert-authored | 3,200+ monographs | SmPC retrieval |
| Scribe | No | No | No (Abridge partner) | Yes | No |
| Exam prep | No | No | CME credits | No | 15+ Q-banks |
| Calculators | No | No | No | No | 80+ tools |
| Regulatory | None | HIPAA/SOC 2 | N/A | HIPAA | MHRA/UKCA |
| Availability | US-first | Global | Global | US-only | UK-focused |
Choosing by Workflow
US attending, quick evidence check during rounds: OpenEvidence (Epic integration) or DoxGPT (Doximity app).
UK GP checking NICE guidance during consultation: iatroX. None of the others retrieve NICE/CKS.
Trainee preparing for MRCP/MSRA/AKT AND needing clinical AI: iatroX. Only platform combining both.
Complex referral letter or literature review: ChatGPT for Clinicians. GPT-5 writing and synthesis.
Drug interaction check (accuracy critical): DoxGPT (3,200+ curated monographs) or UpToDate. For UK prescribing: iatroX retrieves SmPC data.
Deep clinical review of complex case: UpToDate. No tool matches its depth of expert-authored content.
AI scribe + clinical AI in one tool: DoxGPT. Documentation and decision support in one interface.
The Trust Spectrum
Expert curation (30yr institutional trust): UpToDate. Physician verification (10K+ reviewers): DoxGPT PeerCheck. Regulatory governance (medical device): iatroX. Source control (PubMed-only): OpenEvidence. Model benchmarks (HealthBench): ChatGPT for Clinicians.
The Price Disruption
Three of five are free. DoxGPT free via Doximity. Only UpToDate charges $500+/year. Likely outcome: UpToDate retains institutional customers; individual subscriptions decline as free tools capture daily queries.