Organization
Chai Discovery
Model developer · Research lab · San Francisco, California
Chai Discovery develops AI models for predicting and designing molecular structures and interactions for drug discovery. It released Chai-1, a structure prediction model whose code and weights are now under Apache 2.0, and offers its later Chai-2 design models through an access program rather than as downloads.174
Using this organization’s offerings
Intended users
Researchers who run Chai-1 locally or in the web server, and life-science organizations seeking access to Chai-2 for antibody and protein design.74
Hosted and self-hosted access
Chai-1 is installed from PyPI and downloads its weights automatically; a hosted web server is also offered. Chai-2 access is requested through a form.74
Restrictions and review limits
The chai_lab package requires Linux and a CUDA GPU with bfloat16 support, and its README covers inference only, not training. The terms for Chai-2 access were not reviewed. This profile is not a full product or rights audit.7
Key facts
- Legal name
- Chai Discovery, Inc. (as named in the original Chai-1 community license)9
- Ownership (separate from openness)
- Privately held
Recorded classification; fact-level ownership verification pending.
- Legal form
- Unknown
- Founded
- Unknown
- Sectors
- Science, Open models, Research
What is and isn’t public
Products
No hosted model products are recorded for this organization.
Other products
| Product | Kind | Documented delivery and access | Reviewed |
|---|---|---|---|
| Chai Lab web server (external site: lab.chaidiscovery.com) | Other | Browser-based service for running Chai-1 without local setup; it requires signing in with an email link.76 | Oct 1, 2026 |
| Chai-2 access program (external site: chaidiscovery.com) | Other | Commercial organizations request access to Chai-2 through a form; Chai says it will offer limited non-commercial access for academics through an early-access form.4 | Oct 1, 2026 |
Cataloged artifacts
Model families
- Chai-1Model family
Model releases
- Chai-1 (weights used by chai_lab 0.6.1)Model releaseAvailability: PublicModel-disclosure tier (USASI rubric v0.2): Open-weight
Notable documented facts
- Chai-1 was first released in September 2024 under the Chai Discovery Community License Agreement, which limited use of the code, weights, and outputs to non-commercial purposes and incorporated an acceptable use policy. On November 27, 2024 the repository license was replaced with Apache License 2.0, and the README now states that code and weights are both under Apache 2.0.91078
- Chai's news page describes a 2026 Pfizer license agreement giving access to its platform, including a model called Chai-3; no public weights for Chai-2 or Chai-3 were found in the pages reviewed.5411
Open positions
Automated job coverage is not configured for this organization.
What this catalog does not know
- Founding date: not documented in the sources reviewed.
Have a primary source? How to report a correction.
U.S. eligibility
Eligible · basis: U.S. headquarters
Chai Discovery's careers page says its team works in person in San Francisco, California, and its website terms are governed by California law with disputes resolved in San Francisco courts. Its original Chai-1 license names the company as Chai Discovery, Inc. No regulatory filing listing a principal office was reviewed.239
Sources
This listing is not an endorsement or a federal approval.