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ChatGPT advertising

Advertise on ChatGPT with Castle.

Castle helps ambitious brands launch, optimise and scale high-performing ChatGPT advertising campaigns that put your business in front of customers at the exact moment they are researching products, comparing services and deciding what to buy.

Paid mediaAI searchContextual targetingFull management
900mWeekly ChatGPT users28.6%User growth since Aug 202549%Of messages seek advice2026UK market launch

ChatGPT advertising

Reach your customers where they are searching.

AI-powered search is changing the way people discover products, research services and make purchasing decisions. Millions of users now turn to ChatGPT every day to ask questions, search for services, compare providers and seek personalised recommendations. This creates a whole new opportunity for businesses to connect with potential customers on a revolutionary new platform.

As the UK’s leading ChatGPT advertising agency, Castle helps businesses of all sizes launch, manage and optimise ChatGPT advertising campaigns that put your brand in front of highly engaged audiences exactly when they are looking for your product or service.

Explainer

What are ChatGPT ads?

OpenAI has recently introduced ChatGPT ads — a new form of digital advertising that allows businesses to reach users where they are actively searching, through AI-powered conversations.

Ads are currently eligible to users on the Free and Go ChatGPT plans, and are selected to be shown based primarily on the context and intent of the conversation rather than the traditional keyword matching you find with Google Ads. Ads in ChatGPT appear separately from responses and are clearly labelled as sponsored.

ChatGPT ads engage users from their initial research right through to the final decision, reaching them at every stage of the funnel.

Two ChatGPT conversations showing sponsored product and law firm results

How it works

How ChatGPT advertising works.

Ads appear alongside conversations, only where relevant, rather than interrupting the natural flow of answers.

A user types a question or research prompt into ChatGPT
The AI analyses query context and intent to generate a helpful response
A clearly labelled Sponsored ad appears, matched by conversational context
High-intent users click through to your landing page

Targeting

Context and intent, not keyword lists.

Who sees ChatGPT ads

Ads are shown to users on the Free and Go tiers. Paid users on Plus, Pro, Business, Enterprise and Edu remain ad free — so your ads reach explorers, researchers and decision-makers evaluating tools before committing.

Context-driven targeting

Rather than targeting exact keywords, ChatGPT uses conversational context and intent signals. Advertisers provide context hints describing the conversations where their ads should appear.

AI understands intent

If someone asks “I’m looking for accounting software for a growing business”, your product can appear naturally within that conversation. Same for “I want to compare CRM systems”.

Examples of ChatGPT ad formats
Ad formats currently available in ChatGPT.

The case for ChatGPT ads

Why advertise on ChatGPT?

As more people turn to AI to research products, compare services and make purchasing decisions, ChatGPT has become a powerful new marketing channel for brands.

Weekly active users

ChatGPT has around 900 million weekly active users who rely on it for advice, research and recommendations — one of the fastest-growing digital audiences in the world.

Connect with high-intent customers

Users are often asking detailed questions because they are actively researching a product, comparing providers or preparing to make a decision.

Visibility earlier in the journey

A growing number of people use ChatGPT as their first choice for research before they ever visit a search engine, letting your brand influence decisions early.

Contextual targeting

ChatGPT advertising uses the context and intent behind a conversation, helping your adverts appear alongside discussions that closely align with your products.

Get ahead of the competition

AI search advertising is still an emerging channel, giving forward-thinking businesses the chance to build a presence before the market becomes saturated.

Future-proof your strategy

AI-powered search continues to grow alongside traditional search engines, so you stay visible wherever your customers are looking for answers.

Our expertise

How can Castle help?

At Castle we help businesses unlock the potential of ChatGPT advertising by developing tailored campaigns that put your brand in front of highly engaged users at the moments that matter most.

Whether you are looking to launch your first ChatGPT advertising campaign or want to integrate AI search into your wider digital marketing strategy, our team can guide you every step of the way. We take the time to understand your business, your audience and your commercial objectives before building campaigns.

From campaign strategy and setup to audience targeting, optimisation and performance reporting, we manage every aspect of your ChatGPT advertising — combining our expertise in paid media, SEO and AI search.

Dedicated account managerTransparent monthly reportingFull campaign managementNo lock-in contracts

Process

Our ChatGPT advertising process.

Discovery
Audience research
Campaign strategy
Creative production
Launch
Testing
Weekly optimisation
Reporting

Industry fit

Who should advertise on ChatGPT?

ChatGPT ads are ideal for brands whose customers research, ask for recommendations and compare before deciding.

B2B SaaSProfessional servicesLegal firmsHealthcareEducationTravelFinanceRetail and ecommerceLuxury brandsTechnologyRecruitmentProperty

FAQ

Frequently asked questions.

Can you advertise on ChatGPT?
Yes. OpenAI has introduced ChatGPT ads, which are currently served to users on the Free and Go plans. Castle can launch, manage and optimise campaigns on your behalf.
How do ChatGPT ads work?
Ads are matched to the context and intent of a conversation rather than exact keywords. They appear separately from the AI’s answer and are clearly labelled as sponsored, so users can always tell them apart from ChatGPT’s own response.
Who sees ChatGPT ads?
Users on the Free and Go tiers. Paid users on Plus, Pro, Business, Enterprise and Edu plans remain ad free.
Are ChatGPT ads available in the UK?
Yes — 2026 marks the UK market launch. Castle is a UK-based agency running ChatGPT campaigns for UK brands.
How are ChatGPT ads targeted?
Through conversational context and intent signals. Advertisers provide context hints describing the types of conversations where their ads should appear, and OpenAI matches campaigns to users exploring those topics.
What industries benefit most from ChatGPT advertising?
Any brand whose customers research before they buy. In practice that means B2B SaaS, professional services, legal firms, healthcare, education, travel, finance, retail and ecommerce, luxury brands, technology, recruitment and property.
Are ChatGPT ads better than Google Ads?
They are different rather than strictly better. ChatGPT reaches people earlier in their research using contextual matching instead of keyword bidding, which makes it a strong complement to paid search rather than a straight replacement.
Do ChatGPT ads influence AI answers?
No. Advertising is separate from ChatGPT’s core responses. Ads appear alongside the conversation and are clearly labelled as sponsored.
Can I target specific keywords?
Not in the traditional sense. Targeting is built on conversational context and intent rather than exact-match keyword lists, so campaigns are set up around the topics and questions your customers bring to ChatGPT.

Get started today

Ready to advertise on ChatGPT?

Join forward-thinking UK brands already reaching high-intent customers through AI-powered search advertising.

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