Nebius AI Cloud vs OpenAI API: who uses which
Customers, public proof and the companies that use both.
On usedby, 48 companies use Nebius AI Cloud and 5 use OpenAI API. 1 company uses both, including Cursor. Nebius AI Cloud leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Oct 14, 2026: 52 of 53 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 Nebius AI Cloud, OpenAI API, or both
Every company with a public proof for at least one of the two tools.
47
use only Nebius AI Cloud
1
company uses both
4
use only OpenAI API
47 companies use only Nebius AI Cloud, 4 use only OpenAI API and 1 uses both, out of the 52 companies on usedby that use at least one of them.
Where it lands
Recently publicly listed customers
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, OpenAI API |
|---|---|
 Cursor | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Nebius AI Cloud, OpenAI API or both: a share of the companies on usedby, not of the market.
Nebius AI Cloud onlyBothOpenAI API only
More common with Nebius AI Cloud
- Artificial Intelligence21 of the 21 Artificial Intelligence companies on usedby that use either tool use Nebius AI Cloud.
- Biotech & Pharma4 of the 5 Biotech & Pharma companies on usedby that use either tool use Nebius AI Cloud.
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.
Nebius AI Cloud
OpenAI 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.
Nebius AI Cloud
TrialHub reduces the time spent on feasibility assessments by 50%
TrialHub
Vendor case study, nebius.com, captured Oct 7, 2026
a single H100 GPU completed the training process 50–80% faster than the A100 GPU
Krisp
Vendor case study, nebius.com, captured Oct 7, 2026
OpenAI API
No reviewed story for OpenAI API yet.
Questions about Nebius AI Cloud and OpenAI API
Which is used more, Nebius AI Cloud or OpenAI API?
Nebius AI Cloud has more customers on usedby: 48 against 5 for OpenAI API.
Do companies use both Nebius AI Cloud and OpenAI API?
Yes. 1 company uses both on usedby, including Cursor.
Who uses Nebius AI Cloud?
48 companies on usedby, each with the public page that shows it. See who uses Nebius AI Cloud.
Who uses OpenAI API?
5 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 three proof levels: confirmed, 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.