What Font Does ChatGPT Use? Typeface & Alternatives Explained

Typography influences how we absorb information, shaping our digital experiences at every glance. If you’ve ever wondered, what font does ChatGPT use?, the short answer is they use OpenAI Sans for branding, Segoe UI for its main interface text, and Victor Mono in the chat input area.

We’ll further down the official typeface, interface choices, and the best alternatives for designers and developers.

OpenAI Sans: The official branding font

OpenAI Sans is the company’s signature geometric sans-serif, introduced at the start of 2025. Its precise lines and rounded forms create an approachable, confident look that’s central to OpenAI’s visual identity. You’ll find OpenAI Sans across branding materials, webpages, and select product interfaces. The font family includes five weights—Light, Regular, Medium, Semibold, and Bold—each with a matching italic. OpenAI’s brand guidelines, available on their website, provide detailed direction on everything from spacing to color pairings, ensuring a cohesive presentation.

Fonts in the ChatGPT interface

Beyond branding, the ChatGPT interface prioritizes clarity and usability through its font choices.

• Primary font: The main interface uses Segoe UI by default, as revealed by the underlying CSS. This sans-serif, widely used by Microsoft, offers sharp, modern readability.

• Chat input area: In the text box where users type, ChatGPT employs Victor Mono. This choice subtly distinguishes user input from system responses.

• Public speculation: While OpenAI hasn’t made an official statement, many users and font experts notice similarities to Open Sans throughout the interface.

Closest alternatives to ChatGPT’s font

Designers searching for similar fonts have several strong options. These alternatives echo the clarity and modern feel of ChatGPT’s interface:

Open Sans most closely matches ChatGPT’s appearance, but any of these fonts can deliver a similar user experience.

Why typography matters in AI chatbot interfaces

Good typography supports the message without distraction. In AI chatbots, sans-serif fonts like Open Sans and Roboto are favored for their clarity, adaptability, and ease of reading across devices. When designing a chatbot or digital tool, consider these principles:

• Prioritize legibility: Text should be easy to read at any size.

• Choose modern, versatile fonts: Sans-serifs suit a wide range of contexts.

• Ensure cross-platform consistency: Fonts must render well everywhere.

• Support accessibility: Opt for generous spacing and clear letterforms.

Additional insights and future trends

CSS analysis highlights Segoe UI as the dominant font in ChatGPT’s interface, with Victor Mono adding a distinctive touch to the chat input. Designers continue to discuss these choices, weighing readability against brand personality. Looking ahead, font selection may become even more personalized as AI evolves—imagine chatbots that adjust typography for each user, optimizing readability and mood in real time.

Conclusion

ChatGPT officially uses OpenAI Sans for branding, while its interface relies on Segoe UI and Victor Mono. For those seeking a similar style, Open Sans, Roboto, and Noto Sans are excellent alternatives. Ultimately, thoughtful font choices enhance clarity and support seamless conversation, allowing ideas to take center stage.