Chat AI from China's DeepSeek. It offers high-performing open-weight models free or at very low cost, and shot to fame with its R1 reasoning mode.
Models
Pricing
- アプリ / WebFree
Chat, reasoning mode, and web search — entirely free.
- APIPay-as-you-go (very cheap)
Tokens priced an order of magnitude below the big labs — a developer favorite.
※ For reference as of January 2026. Prices and plans change often — always check the official site for the latest.
Key features
DeepThink (reasoning)
R1-style reasoning that shows its thinking, free for everyone.
Open-weight releases
Model weights are published, so you can self-host.
Web search & file reading
A practical chat with search and document upload.
Extreme cost efficiency
Price-per-performance is the headline — a staple backend for apps.
Tier lists featuring this service
Categories aggregate their whole subtree; threads count their own votes. Tap a row to open the tier list.
Not ranked in any tier list yet. Cast the first vote in a thread you care about.
Arena benchmark standings
arena.ai (formerly LMArena) blind-battle results converted into tiers for reference. See each category page for the conversion rules