Get Font Info

What font does OpenAI use?

OpenAI's website uses Söhne (the brand's house sans-serif from Klim Type Foundry) for body and most headlines, with custom lettering reserved for the logo lockup. Signifier — a contemporary Didone serif also from Klim — is used in marketing pieces.

Quick answer

OpenAI's website uses Söhne (the brand's house sans-serif from Klim Type Foundry) for body and most headlines, with custom lettering reserved for the logo lockup. Signifier — a contemporary Didone serif also from Klim — is used in marketing pieces.

Söhne

Commercial license required

A contemporary grotesque inspired by Akzidenz-Grotesk and the Helvetica lineage but redrawn for the digital era. Used across OpenAI's website and product marketing.

Designer
Kris Sowersby (Klim Type Foundry)
Released
2019
Where OpenAI uses it
Brand · Body copy · Headlines
License
Commercial license from Klim Type Foundry.

CSS to use Söhne

font-family: Söhne, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
Get Söhne

Free or accessible alternatives

InterGT AmericaNeue Haas GroteskAktiv Grotesk

Signifier

Commercial license required

A contemporary serif drawing from the Romantic tradition, used occasionally on OpenAI's research and marketing pages for editorial moments.

Designer
Kris Sowersby (Klim Type Foundry)
Released
2020
Where OpenAI uses it
Headlines
License
Commercial license from Klim Type Foundry.

CSS to use Signifier

font-family: Signifier, Georgia, 'Times New Roman', serif;
Get Signifier

Free or accessible alternatives

Source Serif 4NewsreaderLoraPlayfair Display

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.

Open live font inspector for openai.com

Frequently asked questions

Who designed Söhne?

Söhne was designed by Kris Sowersby (Klim Type Foundry), released in 2019. A contemporary grotesque inspired by Akzidenz-Grotesk and the Helvetica lineage but redrawn for the digital era. Used across OpenAI's website and product marketing.

Can I download Söhne?

Not for free. Söhne requires a commercial license from the foundry (https://klim.co.nz/retail-fonts/soehne/). If you need a free option, Inter, GT America, Neue Haas Grotesk are close substitutes.

What are free alternatives to Söhne?

If you want a similar look without Söhne, try Inter, GT America, Neue Haas Grotesk, Aktiv Grotesk. Inter in particular is widely available and free on Google Fonts or under an open-source license.

About this page

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.

More guides: how to find fonts on a website, name the font on a website, what font does this website use, or free font checker.