DeepSeek
Free chat assistant and open-weight reasoning models, with the cheapest mainstream API.
- Web
- iOS
- Android
- Why it's listed
- The web and mobile app are free with no meaningful limits.
- Consider before using
- During peak times the free tier slows down.
From the vendor's site: DeepSeek is a Chinese AI lab whose chat assistant is free at deepseek.com and whose reasoning models are released as open weights. Its API priced frontier-level reasoning at a fraction of Western providers, and the app remains one of the best free assistants for coding and analysis.
What it is
DeepSeek offers a chat assistant plus a family of open-weight models. Ask it a question, paste a document, or hand it a coding task; a "deep think" mode spends extra compute on hard problems. The same models are available via an OpenAI-compatible API.
Pricing
| Plan | Price | What you get |
|---|---|---|
| Web / app | $0 | Full chat access, slow at peak times |
| API | pay per token | Among the lowest mainstream API prices |
Verdict
If you only use one free assistant, this is the pick — especially for reasoning and code. Assume prompts are not private.
Last checked: October 2026. Pricing and features change fast — confirm current numbers on the official site.