DeepSeek
A strong chat assistant that is completely free.
Best freeFreeOpen
- Best for
- Free reasoning, maths and code
- On your PC
- No, online only
- Works on
- Web, iPhone, Android, API
- License
- MIT
What’s good
- Free with no paid tier to upsell you
- Open model under the MIT license
- Ranks in LMArena's top 40
Downsides
- Data is stored on servers in China
- Avoids topics sensitive to the Chinese government
- Model is 763B parameters, far too big for a home PC
At a glance.
- Best for
- Free reasoning, maths and code
- Price
- Free, open source
- For developers
- $0.045 in, $0.50 out per million tokens (V4.1 Flash, OpenRouter)
- Version
- DeepSeek V4.1 Flash (1017 update)Released 2026-10-17
- Works on
- Web, iPhone, Android, API
- Open source
- Yes, MIT
- Made by
- DeepSeek
- Website
- chat.deepseek.com
How it ranks.
- LMArena Text, style control (DeepSeek V4.1 Flash Max)#35 · 14762026-11-05
Can I run it myself?
No. It only runs online.
Your prompts and files go to the company’s servers. See the local options in this category for a private alternative.
Want it offline? The best local option for ai chat is Qwen Chat.