Azure OpenAI vs Claude: who uses which
Customers, public proof and the companies that use both.
On usedby, 3 companies use Azure OpenAI and 184 use Claude. 1 company uses both, including Harvey. Claude leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 15, 2026: 161 of 187 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, Claude, 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.
183
listed for Claude only
On usedby, 2 companies are listed for Azure OpenAI only, 183 are listed for Claude only and 1 uses both, 1 of them through a job post on one side, out of the 186 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
No new public customer listing since tracking started on October 2, 2026.
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 | First public proof, Claude |
|---|---|---|
 Harveyjob post for Azure OpenAI | Job post, Sep 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 Azure OpenAI, Claude or both: a share of the companies on usedby, not of the market.
Listed for Azure OpenAI onlyBothListed for Claude only
More common with Claude
- Artificial Intelligence28 of the 30 Artificial Intelligence companies on usedby that use either tool use Claude.
- DevTools & Infrastructure28 of the 28 DevTools & Infrastructure companies on usedby that use either tool use Claude.
- Fintech & Payments19 of the 19 Fintech & Payments companies on usedby that use either tool use Claude.
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 6; Claude, 5 of 6. Missing facts remain unverified, not absent features.
Azure OpenAIClaudeWhat 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.
Claude
Cuts the time to complete an agreement 10x, from roughly 10 hours of lawyer work to about one
Spellbook
Vendor case study, claude.com, captured Oct 30, 2026
Gave around 700 people access to Claude Code and Claude Cowork to date
Pictet
Vendor case study, claude.com, captured Oct 30, 2026
Questions about Azure OpenAI and Claude
Which is used more, Azure OpenAI or Claude?
Claude has more customers on usedby: 184 against 3 for Azure OpenAI.
Do companies use both Azure OpenAI and Claude?
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 Claude?
184 companies on usedby, each with the public page that shows it. See who uses Claude.
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.