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Anthropic vs OpenAI
Pick 2-5 products, models, companies or categories. The table shows measurable differences with sources; highlighted cells mark the objectively highest or lowest value in a row, never an overall winner.
Companies (2)
| Attribute | Anthropic | OpenAI |
|---|---|---|
| AI footprint rank | #1 | #2 |
| Tracked products | 6 | 11 |
| Tracked models | 114 | 209 |
| Top ECI | 165 · Claude Fable 5.1 | 166.6 · GPT-6 Astra |
| Founded | 26 Jan 2021 | 11 Dec 2015 |
| Headquarters | San Francisco | San Francisco |
| Employees | 2,500 (2026) | 4,500 (2026) |
| Revenue (whole company) | Not disclosed | $25.0B |
| Categories | General assistants, Coding, Research, Writing, Coding agents, Browser & computer-use agents | General assistants, AI search, Research, Coding, Browser & computer-use agents, Coding agents |