In 2026, AI agents have evolved from "chat" to "getting things done for you". This page compares the leading AI tools and gives use-case recommendations so you can choose without trial and error.
How to pick an AI agent? Check four things: ① model capability (reasoning / long context / multimodal) ② workflow integration (docs, code, email, browser) ③ data privacy & compliance ④ price and quota. There is no "best" — only "best for your next step".
Leading AI tools compared
| Tool | Vendor | Positioning | Strongest at | Best for | Price |
|---|---|---|---|---|---|
| ChatGPT | OpenAI | General flagship | All-round strength, richest ecosystem & plugins | Almost everyone | Free / Plus |
| Claude | Anthropic | Long-text / rigorous reasoning | Long documents, code, compliance-friendly | Researchers, developers, legal | Free / Pro |
| Gemini | Multimodal / search integration | Massive info retrieval, multimodal | Heavy Google ecosystem users | Free / Advanced | |
| Microsoft Copilot | Microsoft | Built into Office suite | Word / Excel / PowerPoint integration | Heavy Office users | With Microsoft 365 |
| Perplexity | Perplexity AI | Answer engine | Real-time retrieval with citations | Research, fact-checking | Free / Pro |
| DeepSeek | DeepSeek | Cost-effective reasoning | Chinese reasoning, cost-effective code | Developers, cost-sensitive users | Free / low-cost API |
| WorkBuddy | Tencent | Desktop agent / automation | Local files, commands, workflow automation | Ops, office automation | Free / premium |
| Qwen / ERNIE / Kimi | Alibaba / Baidu / Moonshot | Chinese scenarios | Chinese fluency, local integration | Domestic business users | Free / subscription |
Pick by use case
Writing / Content
Long-form, polishing, multilingual.
ChatGPTClaudeGemini
Coding / Dev
Code gen, debug, refactor.
ClaudeChatGPTDeepSeekCopilot
Data analysis
Sheets, SQL, visualization.
ChatGPTGeminiClaude
Office automation
Email, docs, workflows.
CopilotWorkBuddy
Research / Fact-check
Cited retrieval.
PerplexityGemini
Chinese business
Local integration.
QwenERNIEKimi
AI performance & hardware
To benchmark the agents themselves, see the AI Agent ladder (中文). To run local models and pick GPUs and memory, use our hardware ladders: