ChatGPT vs Claude: who uses which
Customers, public proof and the companies that use both.
On usedby, 40 companies use ChatGPT and 73 use Claude. 4 companies use both, including BCG, Shopify, and Intercom. Claude leads among the DevTools & Infrastructure companies on usedby that use either tool.Latest check Oct 8, 2026: 49 of 113 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses ChatGPT, Claude, or both
Every company with a public proof for at least one of the two tools.
30
use only ChatGPT
4
companies use both
63
use only Claude
30 companies use only ChatGPT, 63 use only Claude and 4 use both, out of the 103 companies on usedby that use at least one of them.
6 more companies are listed for both, with a job post on one side: not counted as using both.
Where it lands
Newest customers
We have not started tracking changes for ChatGPT yet.
Where it lands
Newest customers
No new customer since tracking started on October 2, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Claude |
|---|---|
 BCG | — |
 Shopify | On or before Jan 2026 |
 Intercom | On or before Sep 2025 |
 Notion | On or before Sep 2025 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use ChatGPT, Claude or both: a share of the companies on usedby, not of the market.
ChatGPT onlyBothClaude only
More common with Claude
- DevTools & Infrastructure6 of the 8 DevTools & Infrastructure companies on usedby that use either tool use Claude, 1 of them alongside ChatGPT.
- Fintech & Payments4 of the 7 Fintech & Payments companies on usedby that use either tool use Claude.
- Artificial Intelligence5 of the 5 Artificial Intelligence companies on usedby that use either tool use Claude.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
ChatGPTClaudeWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Questions about ChatGPT and Claude
Which is used more, ChatGPT or Claude?
Claude has more customers on usedby: 73 against 40 for ChatGPT.
Do companies use both ChatGPT and Claude?
Yes. 4 companies use both on usedby, including BCG, Shopify, and Intercom.
Who uses ChatGPT?
40 companies on usedby, each with the public page that shows it. See who uses ChatGPT.
Who uses Claude?
73 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 three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.