Cerebras vs OpenAI API: who uses which
Customers, public proof and the companies that use both.
On usedby, 35 companies use Cerebras and 45 use OpenAI API. 1 company uses both, including Hebbia. Cerebras leads among the Artificial Intelligence companies on usedby that use either tool, OpenAI API among the DevTools & Infrastructure companies.Latest check Nov 13, 2026: 79 of 80 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 Cerebras, OpenAI API, or both
Every company with a public proof for at least one of the two tools.
34
listed for Cerebras only
1
company uses both
44
listed for OpenAI API only
On usedby, 34 companies are listed for Cerebras only, 44 are listed for OpenAI API only and 1 uses both, out of the 79 companies listed for at least one. An absent listing does not prove non-use.
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, Cerebras | First public proof, OpenAI API |
|---|---|---|
 Hebbia | On or before Nov 2026 | On or before Nov 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Cerebras, OpenAI API or both: a share of the companies on usedby, not of the market.
Listed for Cerebras onlyBothListed for OpenAI API only
More common with Cerebras
- Artificial Intelligence15 of the 24 Artificial Intelligence companies on usedby that use either tool use Cerebras, 1 of them alongside OpenAI API.
More common with OpenAI API
- DevTools & Infrastructure5 of the 7 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.
Vendor facts checked: Cerebras, 3 of 5; OpenAI API, 2 of 5. Missing facts remain unverified, not absent features.
CerebrasOpenAI APIQuestions about Cerebras and OpenAI API
Which is used more, Cerebras or OpenAI API?
OpenAI API has more customers on usedby: 45 against 35 for Cerebras. Cerebras leads among the Artificial Intelligence companies on usedby that use either tool, OpenAI API among the DevTools & Infrastructure companies.
Do companies use both Cerebras and OpenAI API?
Yes. 1 company uses both on usedby, including Hebbia.
Who uses Cerebras?
35 companies on usedby, each with the public page that shows it. See who uses Cerebras.
Who uses OpenAI API?
45 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.