There are many AI search engines to choose from, and each combines features differently: source citations, multi-step research, long document handling, and real-time social search. These tools keep changing, so interfaces and feature names may be different after a while. This article does not rank them or compare precise test results. Instead, it summarizes publicly documented features and use cases for Perplexity, ChatGPT Search, Gemini, Grok, Kimi, Doubao, and You.com to help you choose for your current needs. Check each provider’s official pages for current terms.
AI Search Engines at a Glance
| Tool | Developer | Suggested use (editorial recommendation) | Paid plan |
|---|---|---|---|
| Perplexity | Perplexity AI | Checking sources one by one and multi-step research | Official plans |
| ChatGPT Search | OpenAI | Search, then continue working in the same conversation | Official pricing |
| Gemini / Google Search | Looking up information within the Google ecosystem | Official information | |
| Grok | xAI (now SpaceXSI) | Following live discussions on X | Official page |
| Kimi | Moonshot AI | Asking questions in Chinese and working with long documents | Official membership page |
| Doubao | ByteDance | Looking up information from China | Official page |
| You.com | You.com | Switching between traditional search and AI organized answers | See the consumer plans after signing in |
Limits, prices, and regional availability can change. Check the linked official pages for current details; this article does not repeat prices. The suggested uses in the table are editorial recommendations, not official rankings or test results. Often several tools can handle the same need. Try a few before deciding whether to pay, or compare answers from two or three tools at once.
Perplexity
Perplexity’s search answers include source links that you can open to check the original text. It also offers Research mode, previously called Deep Research, which runs multi-step searches and produces reports with sources. The free version’s basic search is nearly unlimited, while Pro Search has a limited allowance. Paid plans provide higher limits.
Pro Search conducts a deeper search based on your question and lists sources. Research suits tasks that involve gathering information in multiple steps and producing a report, such as background research before writing a long article. It is useful for people who need to check sources one by one and gather material before writing. See the official plans for current limits and prices.
ChatGPT Search
ChatGPT has a built-in search feature that can look up information during a conversation and include source links. You can continue working with the results in the same conversation. Since search and regular chat share an interface, you can ask it to summarize, compare, translate, or rewrite what it finds as notes without switching tools. Search features and limits depend on your plan and location. See the official pricing page for plan details. For a fuller introduction, see this article.
Gemini / Google Search
Google Search shows AI summaries for some queries. AI Mode is a separate conversational search entry point, distinct from regular search results. The Gemini app is a standalone conversational app that can also handle search related questions. They are different products. If you already use Gmail, Google Docs, or an Android phone, these entry points may fit your workflow, but their features and release schedules do not always match. Check each product’s official information if you notice a difference. People familiar with Google’s ecosystem can use its built-in features without installing another tool. See the official information.
Grok
Grok can search public X posts and the general web, which makes it useful for following recent discussions. Social posts may not yet be verified. When you see a sensational claim, check the original post’s timestamp and compare it with other sources before drawing a conclusion. See Grok’s features and upgrade options on the official product page. Check the purchase page for current subscription prices. For a full comparison, see Grok vs ChatGPT.
Kimi
Kimi is an AI assistant from Moonshot AI. It supports questions in Chinese, web search with source links, and file uploads such as PDFs for questions about their contents. Check important details against the original file. For supported formats and upload limits, refer to Kimi’s file information. It is a product from a Chinese company, and its interface and feature names may differ from those of other providers. If you are new to it, start with the official guide. For local topics, specify the region and check whether the sources are in the right language and from local sources. See the official membership page for plan tiers and prices.
Doubao
Doubao is an AI assistant from ByteDance, with search as one of its built-in features. Like Kimi, it is a product from a Chinese company. It is part of the same ByteDance ecosystem as Douyin and Toutiao, so it is one option for looking up information about the Chinese market or reading technical documents in Simplified Chinese. For local information such as daily services, prioritize sources from local authorities, businesses, or other original sources. Check the official page for login methods, available features, and prices.
You.com
You.com publicly describes its Web Search, Answer, and Research services. It may suit people who want to switch between traditional search and AI organized answers. Check the signed-in page for the consumer interface and available modes. The public pricing page lists API rates. Check the signed-in page for consumer plans, and do not mistake API rates for membership prices.
How to Choose an AI Search Engine
Choose by use case, not ranking:
- Need to check sources one by one: choose a tool with source links and open each one to verify the original text. Do not cite an answer based only on its summary.
- Need to work with a long document or full PDF: choose a tool that supports file uploads, such as Kimi or Perplexity, then ask questions about the file.
- Need multi-step research on a topic or background research before writing a long article: use Perplexity Research or ChatGPT Deep Research, then spot check several sources.
- Need to follow live discussions on X: use Grok, check the original post’s timestamp, and remember that a new post may not have been corrected yet.
- Need local information, such as laws, businesses, or news: check whether the sources are from the relevant region. Pay particular attention when using tools from Chinese companies. A Simplified Chinese source does not necessarily apply to your situation.
- Already use the Google or ChatGPT ecosystem: use its built-in search to avoid installing another tool or managing another account.
- Just have a quick question: use a tool you already have open. The time spent switching tools can exceed the time saved.
Search the same question once in Chinese and once in English to compare the sources. For information that could affect a decision, such as laws, amounts, or dates, open the original link and confirm it before relying on it.
Penchan’s Experience
My default for looking things up has changed from Google to Perplexity and ChatGPT. I mainly subscribe to Perplexity Pro for Research, previously called Deep Research, and the Pro Search allowance. ChatGPT’s search has also been doing quite well recently in both depth and breadth. I use both and cross-check them, which makes me less likely to be misled by hallucinations.
My main division of labor: I use Perplexity and ChatGPT to gather information before writing seriously, since they find well-cited sources. I use Grok to follow live discussions on X, since it reacts fastest to X data.
There are still limits to Chinese search. Perplexity does not yet cover enough Chinese sources. Google is still more direct for local news, regulations, and business information. Searching the same question in both Chinese and English is a more reliable approach.
