AI search in 2026 is not one market — it's two. International tools (Perplexity, ChatGPT Search) excel at English content. Chinese tools (Kimi, 秘塔AI, 天工AI) are dramatically better for Chinese content.
Users who need both typically maintain subscriptions to both.
Sources: perplexity.ai, kimi.moonshot.cn, metaso.cn, www.tiangong.cn, chatgpt.com
Quick Comparison Table
| Engine | Free Tier | Entry Paid | English Content | Chinese Content | Citation Quality | Best For |
|---|---|---|---|---|---|---|
| Perplexity | ✅ Unlimited basic | $20/mo Pro | ⭐⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ | Research, academic |
| ChatGPT Search | ✅ GPT-4o limited | $20/mo Plus | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | General, all-purpose |
| Kimi | ✅ Generous free | ¥99/mo Pro | ⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | Chinese content, long docs |
| 秘塔AI | ✅ Free | Free/gov. pricing | ⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | Legal, academic, professional |
| 天工AI | ✅ Free | Free | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | General Chinese search |
| 360AI Search | ✅ Free | Free | ⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | Chinese local info |
Perplexity — Best English Research
Pricing: Free (unlimited basic, 5 Pro/day) → Pro $20/mo (unlimited Pro, Deep Research) → Max $200/mo
Perplexity remains the gold standard for AI search with citations. Every answer links to source pages. Deep Research mode produces analyst-quality reports.
Chinese limitation: Chinese content index coverage is weak. Searches for Chinese tech news, local products, or WeChat articles often return English results or miss relevant Chinese sources entirely.
Best for: English research, academic work, any task where verifiable citations matter.
Kimi — Best Chinese Content Coverage
Pricing: Free (generous, 1M+ context) → Kimi Pro ¥99/mo
Kimi by Moonshot AI (月之暗面) supports extremely long context (1M+ tokens). It can read entire research papers, books, or codebases. Chinese content coverage is its core strength — it indexes WeChat public accounts, Chinese news, and domestic sources better than any international tool.
Strengths:
- Best Chinese content coverage: finds WeChat articles, Chinese tech news, policy documents
- 1M+ token context: upload entire books or PDFs for analysis
- File reading: PDF, Word, images, URLs — reads and answers
- Generous free tier: no hard daily limits for most users
Weaknesses:
- English content quality lags behind Perplexity
- Citation format less transparent than Perplexity
- Source origin: sometimes unclear which part of the answer came from which source
Best for: Users whose primary content is Chinese. Researching Chinese products, policies, or news.
秘塔AI — Best for Professional Research
Pricing: Free. Paid plans for enterprise/government.
秘塔AI (Mita AI) by Shanghai Mita Technology takes a different approach from general AI search. Its sources skew toward official documents, academic databases, and authoritative media — filtering out SEO spam and low-quality content farms.
Strengths:
- Most serious sources: legal docs, academic papers, official government releases
- Research Mode: decomposes questions into sub-queries, searches each, synthesizes
- No ads, clean interface: designed for professional use
- Academic search: dedicated academic data sources
Weaknesses:
- Weak on entertainment, lifestyle, consumer content
- Smaller index than Kimi or 360
- English content limited
Best for: Legal professionals, researchers, business due diligence. Anyone who needs authoritative sources.
Feature Comparison
| Feature | Perplexity | ChatGPT Search | Kimi | 秘塔AI | 天工AI | 360AI Search |
|---|---|---|---|---|---|---|
| English quality | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐ | ⭐⭐⭐ | ⭐⭐ |
| Chinese quality | ⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Citation clarity | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ |
| Source authority | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ |
| Long context | ❌ | ✅ 1M | ✅ 1M+ | ❌ | ❌ | ❌ |
| Free tier usable | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Entry price | $20/mo | $20/mo | ¥99/mo Pro | $0 | $0 | $0 |
Quick Decision Guide
| If you need... | Choose | Price |
|---|---|---|
| English research with citations | Perplexity (Pro) | $20/mo |
| Chinese content + long doc reading | Kimi (Free) | $0 |
| Legal/academic authority | 秘塔AI (Free) | $0 |
| General Chinese daily search | 天工AI (Free) | $0 |
| All-purpose with GPT power | ChatGPT Search (Plus) | $20/mo |
Summary
The optimal setup for most Chinese users in 2026: Kimi (free) for Chinese content + Perplexity (free tier) for English research. Total: $0.
For professional use requiring authoritative sources, add 秘塔AI — also free.
For heavy English research, Perplexity Pro at $20/mo is the only paid tier worth considering.
Pricing sourced from official websites as of May 2026.