The typeface on openai.com is OpenAI Sans, KaTeX_Main and KaTeX_SansSerif, loaded across 73 @font-face declarations. Every font family, weight and source on this page is read straight from the live CSS — no image guessing, no machine learning, just the rules the browser used.
Get Font Info inspected the homepage of openai.com and parsed 11 stylesheets totalling 475.3 KB. Inside those stylesheets we found 73 @font-face declarations — the rules a browser uses to download and register a custom typeface. The primary typefaces are served from custom web font, and 57 CSS rules reference them across the page.
Check the font on a specific element
Open the live inspector and hover any text on openai.com to see the exact font, weight, size and line-height for that element.
openai.com uses OpenAI Sans, KaTeX_Main and KaTeX_SansSerif as its primary typefaces. These fonts are loaded from a self-hosted webfont and applied across 57 CSS rules on the homepage.
Where does openai.com load its fonts from?
openai.com loads its fonts from a self-hosted webfont. Get Font Info detected 73 @font-face declarations across 11 stylesheets on the live page.
What weights of OpenAI Sans does openai.com use?
openai.com loads OpenAI Sans in 4 weights: 400, 500, 600, 700. If you want to match the look, request the same weights from your font host so you only ship what's actually used.
Can I use the same font as openai.com on my website?
Yes — once you know the font name, you can load it from the same source. If OpenAI Sans isn't a fit (licensing, weight selection, look-and-feel), close alternatives include Inter, Manrope and DM Sans. Use the CSS snippet on this page as a starting point.
Is the font on openai.com free to use?
These fonts are self-hosted webfonts. They may be licensed commercially from a type foundry, custom-made for the brand, or freely available — you would need to identify the typeface and check its license at the foundry.
See fonts used by other sites
Compare the typography on openai.com with how other well-known sites load and use their fonts.
This page lists the fonts loaded by the homepage of openai.com. Get Font Info reads the live CSS — every @font-face rule, every font-family declaration — so you see the exact fonts the browser used, not an image-based guess.