Modal vs OpenAI API: who uses which
Customers, public proof and the companies that use both.
On usedby, 28 companies use Modal and 37 use OpenAI API. 1 company uses both, including Doppel. Modal leads among the Artificial Intelligence companies on usedby that use either tool, OpenAI API among the DevTools & Infrastructure companies.Latest check Oct 18, 2026: 64 of 65 public lines checked. Counts include every proof level, job-post signals included. A company on both tools counts at any proof level, and a job post on one side is marked as such.
Who uses Modal, OpenAI API, or both
Every company with a public proof for at least one of the two tools.
27
use only Modal
1
company uses both
36
use only OpenAI API
27 companies use only Modal, 36 use only OpenAI API and 1 uses both, out of the 64 companies on usedby that use at least one of them.
Who uses both
Companies with a public line on both tools, at any proof level: the strongest proofs come first, and a job post is marked.
| Company | First public proof, Modal | First public proof, OpenAI API |
|---|---|---|
 Doppel | On or before Oct 2026 | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Modal, OpenAI API or both: a share of the companies on usedby, not of the market.
Modal onlyBothOpenAI API only
More common with Modal
- Artificial Intelligence15 of the 19 Artificial Intelligence companies on usedby that use either tool use Modal.
More common with OpenAI API
- DevTools & Infrastructure6 of the 9 DevTools & Infrastructure companies on usedby that use either tool use OpenAI API.
Source: every usedby line, from confirmed proofs to job-post signals (the weakest proof level).
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
ModalOpenAI APIPricing, security and data residency are not checked yet. usedby adds them from each vendor's public pages, with the date of the check.
What customers report
Results as the vendor or the customer published them, with the source and the date.
Questions about Modal and OpenAI API
Which is used more, Modal or OpenAI API?
OpenAI API has more customers on usedby: 37 against 28 for Modal. Modal leads among the Artificial Intelligence companies on usedby that use either tool, OpenAI API among the DevTools & Infrastructure companies.
Do companies use both Modal and OpenAI API?
Yes. 1 company uses both on usedby, including Doppel.
Who uses Modal?
28 companies on usedby, each with the public page that shows it. See who uses Modal.
Who uses OpenAI API?
37 companies on usedby, each with the public page that shows it. See who uses OpenAI API.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of four proof levels: confirmed, declared by the company itself, observed or signal (a job post, the weakest). A company counts as using both tools when it has a line on each, at any level; the list shows the strongest proofs first and marks job posts.