Chai Discovery vs Exa
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Chai Discovery
The AI platform designing novel antibodies and biologics from scratch...
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Exa
Web search and retrieval API built for AI agents and apps
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| RECATOOLS Score | 8.5 / 10 | 7.7 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Freemium | Freemium |
| Free tier | Chai-1 fully free — web interface + Apache 2.0 code/weights for academic and commercial use | 20,000 search requests per month on the free plan; startup and education grants of $1,000 in free API credits also available |
| Paid from | Chai-2 enterprise access: gated, custom pricing (Eli Lilly pays mid-eight figures annually) | API search billed at $7 per 1,000 requests (as of March 2026 pricing update) |
| Has API | ✓ | ✓ |
| Open source | ✓ | ✗ |
| Free to use | ✓ | ✓ |
| Users | Chai-1 widely cited as a leading AlphaFold-3 alternative | — |
| Founded | 2024 | 2021 |
| Maker | Independent (private) | — |
| Verdict | Chai Discovery is one of the most technically credible AI drug discovery platforms of 2025–2026. Chai-1's open-source Apache 2.0 release gives academic and commercial researchers immediate, zero-cost access to state-of-t... |
Exa earns its credibility through customer names, not just claims: Cursor, Notion AI, Cognition and OpenRouter all use it in production, and a $250M Series C at a $2.2B valuation (May 2026, led by a16z) backs that up. Th... |
| Full review → | Full review → |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.