Compare AI tools

	Perplexity S	Kling A	Claude Agent SDK S	ChatGPT Operator B
Tagline	AI search done right. Cited answers, not chat theater.	Kuaishou's video model. The surprise standout.	Anthropic's SDK for building your own agents on Claude.	OpenAI's browser agent. Clicks and types on websites for you.
Category	Research	Video	Agents	Agents
Pricing	Free + $20/mo Pro	Credit-based, free trial	API usage + SDK is free	Included with ChatGPT Pro $200/mo
Best for	Replacing Google for any question where you want a cited answer in seconds.	Anyone who wants top-tier video quality for less.	Developers building custom agents for their own company/product.	Power users willing to pay $200/mo for a browser bot.
Strengths	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Very strong motion + physics Often beats Runway on realism Great price	Production-grade agent primitives Built on Claude (best reasoning) Full control — build exactly what you need	Actually uses websites — fills forms, clicks, checks out Built into ChatGPT Good for repetitive web tasks
Weaknesses	Not a general chatbot Answers can be shallow on complex topics	UX is rough for English speakers Queue times	Developer-only You build the UI	Slow vs doing it yourself Breaks on complex auth flows $200/mo gate
Kai's verdict	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	A-tier. Rising fast. If you can tolerate the UX, quality per dollar is best-in-class.	S-tier for builders. The right primitives. What Kai is built on under the hood.	B-tier. Still early. Manus is more flexible for less money.
Link	Open →	Open →	Open →	Open →