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Anthropic VS OpenAI_
As of 4 November 2026, OpenAI is named by 3,389 companies and Anthropic by 1,811; Anthropic skews to companies under 200 people (46% vs 48%), OpenAI to companies over 1,000 (26% vs 27%).
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: Anthropic's script and mail records show on hundreds of thousands of small sites, OpenAI rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- Anthropic: 2–200 employees
- 46%
- OpenAI: 2–200 employees
- 48%
- Anthropic: 1,000+ employees
- 27%
- OpenAI: 1,000+ employees
- 26%
- Postings per company, 90 days
- 2.6 · 2.9
- Website or DNS footprint
- 139,329 · 110,707
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | Anthropic | share | OpenAI | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 103 | 6% | 188 | 6% | even |
| 2-10 employees | 258 | 14% | 469 | 14% | even |
| 11-50 employees | 278 | 15% | 556 | 16% | even |
| 51-200 employees | 302 | 17% | 604 | 18% | even |
| 201-500 employees | 210 | 12% | 386 | 11% | even |
| 501-1000 employees | 165 | 9% | 298 | 9% | even |
| 1001-5000 employees | 249 | 14% | 449 | 13% | even |
| 5001-10000 employees | 75 | 4% | 126 | 4% | even |
| 10,001+ employees | 171 | 9% | 313 | 9% | even |
| Segment | Anthropic | share | OpenAI | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 989 | 55% | 1,780 | 53% | Anthropic |
| Business & finance services | 413 | 23% | 770 | 23% | even |
| Manufacturing & industry | 89 | 5% | 199 | 6% | even |
| Media & content | 74 | 4% | 139 | 4% | even |
| Consumer services & leisure | 57 | 3% | 102 | 3% | even |
| Commerce & trade | 41 | 2% | 91 | 3% | even |
| Property & construction | 28 | 2% | 47 | 1% | even |
| Utilities & infrastructure | 27 | 1% | 56 | 2% | even |
| Health care | 24 | 1% | 44 | 1% | even |
| Public, community & associations | 21 | 1% | 62 | 2% | even |
| Transport, logistics & rental | 19 | 1% | 35 | 1% | even |
| Hospitality & travel | 18 | 1% | 33 | 1% | even |
| Segment | Anthropic | share | OpenAI | share | Leans |
|---|---|---|---|---|---|
| United States | 1,138 | 63% | 1,994 | 59% | Anthropic |
| United Kingdom | 124 | 7% | 222 | 7% | even |
| Germany | 73 | 4% | 176 | 5% | even |
| Canada | 48 | 3% | 88 | 3% | even |
| France | 48 | 3% | 75 | 2% | even |
| India | 46 | 3% | 136 | 4% | even |
| Australia | 26 | 1% | 50 | 1% | even |
| Netherlands | 23 | 1% | 53 | 2% | even |
| Poland | 20 | 1% | 32 | 1% | even |
| Sweden | 20 | 1% | 32 | 1% | even |
| Brazil | 19 | 1% | 43 | 1% | even |
| Spain | 19 | 1% | 43 | 1% | even |
| Segment | Anthropic | share | OpenAI | share | Leans |
|---|---|---|---|---|---|
| Data & AI | 2,295 | 39% | 4,871 | 39% | even |
| Software engineering | 1,764 | 30% | 3,540 | 29% | even |
| IT operations & business systems | 287 | 5% | 670 | 5% | even |
| Sales | 172 | 3% | 331 | 3% | even |
| Product, program & project management | 154 | 3% | 335 | 3% | even |
| General management & consulting | 101 | 2% | 174 | 1% | even |
| Customer service & success | 58 | 1% | 108 | 1% | even |
| Engineering (non-software) | 56 | 1% | 129 | 1% | even |
| Business development & strategy | 54 | 1% | 92 | 1% | even |
| Marketing & communications | 47 | 1% | 199 | 2% | even |
| Finance & accounting | 23 | 0% | 53 | 0% | even |
| Design & UX | 17 | 0% | 57 | 0% | even |
| Education & training | 12 | 0% | 26 | 0% | even |
| Unclassified | 11 | 0% | 44 | 0% | even |
| construction and civil | 10 | 0% | 21 | 0% | even |
| Human resources | 9 | 0% | 34 | 0% | even |
| research and science | 9 | 0% | 10 | 0% | even |
| Legal, compliance & risk | 8 | 0% | 44 | 0% | even |
| logistics warehouse and transport | 7 | 0% | 10 | 0% | even |
| Quality, safety & environment | 5 | 0% | 18 | 0% | even |
| Administration & office | 2 | 0% | 7 | 0% | even |
| arts media and entertainment | 2 | 0% | 19 | 0% | even |
| manufacturing and production | 2 | 0% | 6 | 0% | even |
| procurement and purchasing | 1 | 0% | 12 | 0% | even |
| real estate and property | 1 | 0% | – | – | outside top 12 |
| Retail & store operations | 1 | 0% | 3 | 0% | even |
| skilled trades and field service | 1 | 0% | 5 | 0% | even |
| social care and community | 1 | 0% | – | – | outside top 12 |
| Travel, leisure & events | – | – | 9 | 0% | outside top 12 |
| facilities cleaning and security | – | – | 3 | 0% | outside top 12 |
| public safety and protective services | – | – | 3 | 0% | outside top 12 |
| healthcare clinical | – | – | 2 | 0% | outside top 12 |
The companies behind each column
Companies using Anthropic →
Companies using OpenAI →
LLM models & APIs ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
OpenAI is named by 3,389 companies in job postings and Anthropic by 1,811; 2,014 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/anthropic-vs-openai)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
Anthropic vs OpenAI: questions
Which is more used, Anthropic or OpenAI?
By companies naming it in their own job postings, OpenAI (3,389) over Anthropic (1,811). By website-and-DNS footprint, Anthropic (139,329 vs 110,707), because its scripts and mail records sit on many small company sites.
Who chooses Anthropic?
46% of Anthropic companies have 2 to 200 employees, against 48% for OpenAI. 27% of Anthropic companies have over 1,000 employees, against 26% for OpenAI.
Do companies run both?
2,014 companies name both in their postings, usually Anthropic in marketing and OpenAI in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
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