Azure OpenAI vs Fireworks AI: who uses which
Customers, public proof and the companies that use both.
On usedby, 3 companies use Azure OpenAI and 48 use Fireworks AI. 1 company uses both, including Harvey. Fireworks AI leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 14, 2026: 51 of 51 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 Azure OpenAI, Fireworks AI, or both
Every company with a public proof for at least one of the two tools.
2
listed for Azure OpenAI only
1
company uses both
1 of them is listed through a job post on one side, the weakest proof.
47
listed for Fireworks AI only
On usedby, 2 companies are listed for Azure OpenAI only, 47 are listed for Fireworks AI only and 1 uses both, 1 of them through a job post on one side, out of the 50 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, Azure OpenAI |
|---|---|
 Harveyjob post for Azure OpenAI | Job post, Sep 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Azure OpenAI, Fireworks AI or both: a share of the companies on usedby, not of the market.
Listed for Azure OpenAI onlyBothListed for Fireworks AI only
More common with Fireworks AI
- Artificial Intelligence12 of the 14 Artificial Intelligence companies on usedby that use either tool use Fireworks AI.
- DevTools & Infrastructure13 of the 13 DevTools & Infrastructure companies on usedby that use either tool use Fireworks AI.
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: Azure OpenAI, 0 of 4; Fireworks AI, 2 of 4. Missing facts remain unverified, not absent features.
Azure OpenAIFireworks AIWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Azure OpenAI
No reviewed story for Azure OpenAI yet.
Fireworks AI
enabling them to ~13x speedup over vanilla inference using Llama-3-70b
Cursor
Vendor case study, fireworks.ai, published Jun 23, 2024
Cresta achieves up to a 100x cost reduction compared to GPT-4
Cresta
Vendor case study, fireworks.ai, published Dec 8, 2024
Questions about Azure OpenAI and Fireworks AI
Which is used more, Azure OpenAI or Fireworks AI?
Fireworks AI has more customers on usedby: 48 against 3 for Azure OpenAI.
Do companies use both Azure OpenAI and Fireworks AI?
Yes. 1 company uses both on usedby, including Harvey.
Who uses Azure OpenAI?
3 companies on usedby, each with the public page that shows it. See who uses Azure OpenAI.
Who uses Fireworks AI?
48 companies on usedby, each with the public page that shows it. See who uses Fireworks AI.
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.