AI Tool Comparison
OpenEvidence vs ChatGPT
An objective side-by-side comparison based on global rankings, AI scores, and monthly user data.
Higher Ranked
OpenEvidence
Research & SearchAI clinical evidence search engine that helps physicians find answers from medical literature.
AI Score27.1 / 100
#610
Global Rank
–
Monthly Users
VS
Higher Ranked
ChatGPT
Writing & ChatThe world's most popular AI chatbot for writing, coding, research, and everyday tasks.
AI Score97.4 / 100
#3
Global Rank
400M+
Monthly Users
Side-by-Side Comparison
| OpenEvidence | ChatGPT | |
|---|---|---|
| Category | Research & Search | Writing & Chat |
| Global Rank | #610 | #3 |
| AI Score | 27.1/100 | 97.4/100 |
| Monthly Users | – | 400M+ |
| Pricing | Free | Freemium |
| Website | openevidence.com | chat.openai.com |
Pros & Cons
OpenEvidence
- Genuinely free for verified US healthcare professionals, funded entirely by advertising
- Massive real-world adoption — approximately 20 million clinical consultations/month as of January 2026
- Substantial recent funding ($250M Series D, $12B valuation) suggests continued platform investment
- Access requires a US NPI number, excluding non-US healthcare professionals
- Withdrew from the EU and UK entirely in April 2026, cutting off previous international access
- Ad-supported model means pharmaceutical advertising is shown during use
ChatGPT
- Largest user base and ecosystem of any AI assistant, with the most third-party integrations
- Genuinely broad capability across writing, coding, research, and file analysis
- Custom GPTs allow tailoring the assistant to specific repeated tasks
- Frequent model updates keep it competitive on raw capability
- Free tier has usage limits and access to a lower-tier model than paid plans
- Can produce confident-sounding but incorrect information, especially without browsing enabled
- Breadth can mean less depth than a tool purpose-built for one specific workflow
- Data usage and training policies require attention for sensitive or regulated work