# How ChatGPT Built Trust-Focused Ad System in 200 Days

> ChatGPT's ad stack delivers $1B revenue in 200 days using LLMs to protect user trust.
- Title: How ChatGPT Built Trust-Focused Ad System in 200 Days · OpenAI
- Summary: ChatGPT's ad stack delivers $1B revenue in 200 days using LLMs to protect user trust. ChatGPT launched an ad system that reaches $1 billion in annualized…
- Keywords: chatgpt, ad stack, user trust, relevance, llm, orchestrator, revenue, 1 billion, 200 days, user experience, ad delivery, ai inference
- Source: OpenAI — https://openai.com/index/building-chatgpt-ad-stack
- Read time: 1 min
- Topics: chatgpt, ad stack, user trust, relevance, llm, orchestrator, revenue, 1 billion, 200 days, user experience, ad delivery, ai inference
## ChatGPT's New Ad System
ChatGPT built an ad delivery system that works with conversations instead of single events.
## User Intent Shifts
User goals develop across conversations, not single queries, requiring ad systems to track evolving needs.
## Stateful Ads Sessions
Ads sessions remember conversation history across turns and multiple conversations to maintain context.
## Post-Trained LLM Orchestrator
An LLM interprets conversations and runs ad flows using tool calls for retrieval, ranking, and delivery.
## Ads Separate from Responses
Ads run in a separate service to prevent influencing ChatGPT's answers and maintain neutral voice.
## User Value First
The system prioritizes user needs over advertiser demands to avoid irrelevant ads.
## 200-Day Launch
ChatGPT Ads reached $1 billion in annualized revenue within 200 days of launch.
## Ad Retrieval Process
The system creates semantic embeddings to find relevant ads while preserving conversation nuances.
## Filtering Ineligible Ads
Ads are filtered for relevance, budget, policy, and timing before final selection.
## Auction for Final Selection
The system runs auctions to determine which ads get shown based on user and advertiser value.
## User Experience Focus
Ads only appear when they add value without disrupting the user's conversation flow.
## Self-Improving System
The ad stack uses feedback loops to improve ad relevance and user experience continuously.
## 100,000+ Advertisers
Over 100,000 advertisers have run ads on ChatGPT since launch.
## 2026 Launch Timeline
The ad system launched in October 2026 with rapid scaling to $1 billion revenue.
## Future Improvements
The team plans to add direct business interactions and improve ad personalization for users.
## Key takeaway

ChatGPT launched an ad system that reaches $1 billion in annualized revenue within 200 days while keeping ads separate from responses.