Not all AI systems update their knowledge at the same pace. Perplexity can pick up changes to your website within hours. ChatGPT without web search takes months to do so. For your visibility, that's decisive.
Why this matters to you
Imagine you've added a new service to your website. Or changed your opening hours. Or put a new offer online.
From when do AI systems see this change? And from when do they recommend your company with it?
The answer is different for every system. The difference ranges from 24 hours to several months.
Perplexity is the fastest
Perplexity has its own web crawler called PerplexityBot and its own search index. The index is updated continuously. Perplexity officially gives 24 hours as a rule of thumb for system changes.
In practice: well-visited websites often see their changes within a few hours. Smaller sites sometimes have to wait up to two weeks.
Perplexity also uses a second crawler that can check your page in real time for every user question. This makes Perplexity the most up-to-date of the big systems.
ChatGPT with web search follows shortly after
For web search, ChatGPT mainly uses Microsoft's Bing index. As soon as your new page is listed in Bing, ChatGPT can cite it. An analysis by Seer Interactive showed that 87 percent of ChatGPT citations match the Bing top results.
OpenAI is also building its own search index. But Bing currently remains the main source. That means for you: good Bing visibility is the basis for ChatGPT visibility.
Microsoft Copilot works similarly
Copilot is built directly on the Bing index. What Bing sees, Copilot sees. For well-visited websites, the Bing index updates every 24 to 48 hours.
With the IndexNow protocol you can tell Bing immediately when something has changed on your website. IndexNow is an open protocol from Microsoft. Many content management systems already have an extension for it. The effort is low, the effect is big.
Google AI Overviews take days to weeks
Google AI Overviews use exactly the same search index as normal Google search. Google has confirmed this several times. There's no separate "AI crawler" and no separate "AI index".
So your new content first has to be crawled by Google and added to the search index. After that, it can appear in AI Overviews. Usually the timeframe is between a few days and several weeks.
According to an Ahrefs study, the AI Overview itself changes on average every 2.15 days. That means: which websites get cited changes regularly.
ChatGPT without web search is the slowest
When ChatGPT answers without web search enabled, it only draws on training data. This data has a fixed cut-off date.
For the current GPT-5.6 models, this cut-off is February 2026. The model doesn't know anything that happened after that. New training cycles take place every three to nine months. Only then does new knowledge enter the model.
What this means for your business
Three consequences follow from this.
First: Your news doesn't reach customers in all AI systems at the same time. In Perplexity and ChatGPT web search first. In Google AI Overviews later. In pure ChatGPT training knowledge much later.
Second: Not all systems are equally important for you. If your customers mainly use Google, the longer wait for AI Overviews is normal. If they use ChatGPT, you need Bing visibility.
Third: A single technical trick speeds up three systems at once. IndexNow reports every change to Bing immediately. Via the Bing route, ChatGPT and Copilot then benefit from it.
What you can do now
Check once a month whether your content appears in AI answers. Ask the questions a customer would ask.
Use IndexNow if you publish new content regularly. It brings faster visibility in Bing, ChatGPT and Copilot.
Keep your website technically clean. Slow or broken pages are captured worse by all AI systems.
Don't rely on ChatGPT training knowledge for current company facts. Important information must be retrievable live.
Frequently asked questions about update speed and AI visibility
Why is Perplexity so fast?
Perplexity is the only one of the big systems with its own search index and a second live crawler that can fetch current pages for every question. Other systems rely on Bing or Google and are therefore bound to their update cycles.
Do I have to choose one particular system?
No. If your website has the basics right, you become visible in all systems. The only question is when. Those who want to be fast should focus on Bing and Perplexity.
What is IndexNow and how do I use it?
IndexNow is an open protocol from Microsoft and Yandex that tells search engines immediately when something has changed on your website. There are ready-made plugins for WordPress and other systems. For static websites, a small script.
Can I register my company directly with OpenAI?
No. There's no company directory at OpenAI. Your visibility comes solely from what OpenAI and its partners learn about your website.
Conclusion
Not all AI systems are equally fast. Perplexity in front. ChatGPT and Copilot with a short delay via Bing. Google AI Overviews slower. ChatGPT without web search the slowest.
Those who know this order can steer their visibility deliberately. And know why a change sometimes appears immediately and sometimes not. The free quick test shows you how well your website is set up for that.
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Sources
- Perplexity Docs: crawlers and update cycles
- Google Search Central: AI Overviews and indexing
- Seer Interactive: analysis of ChatGPT citations and Bing rankings
- Ahrefs: volatility of AI Overviews
- IndexNow protocol at Microsoft
