About DeepSeek
DeepSeek is a Chinese AI research lab that made global headlines with its open-source language models — DeepSeek-V3 (a 671B-parameter Mixture-of-Experts model with 37B active per token) and DeepSeek-R1 (a reasoning model that matched OpenAI-o1 on math, code and logic at a fraction of the cost). As of 2026 the API runs on DeepSeek V4, offering an OpenAI-compatible endpoint plus an Anthropic-format endpoint, with some of the lowest per-token prices in the industry. Models and code are released under the MIT License with commercial use and distillation permitted.
Pricing
Check the official site for current plans and pricing.
Key features
- DeepSeek V4 generation (current):: two API models — deepseek-v4-flash: (1M-token context, up to 384K max output, 2,500 concurrent, the default for web/chat) and deepseek-v4-pro: (higher quality, 500 c
- DeepThink mode:: a toggle on chat.deepseek.com (and the API) switches V4 between fast non-thinking answers and step-by-step reasoning — the successor to R1-style chain-of-thought.
- OpenAI + Anthropic compatible:: use the standard OpenAI SDK (base URL ) or Anthropic-format clients with a one-line model swap; works as a backend for Claude Code, GitHub Copilot, OpenCode and similar
- Industry-low pricing:: ~90% cheaper than flagship OpenAI/Anthropic models; prompt caching (90% discount on cache hits) and JSON mode included.
- Open-source ecosystem:: V3 and R1 weights are MIT-licensed (code) with commercial use and distillation allowed; distilled R1-Distill models (Qwen 1.5B–32B, Llama 8B/70B) run on modest hardware. V3 tra
Pros & cons
Pros
- : two API models — deepseek-v4-flash: (1M-token context, up to 384K max output, 2,500 concurrent, the default for web/ch
- : a toggle on chat.deepseek.com (and the API) switches V4 between fast non-thinking answers and step-by-step reasoning —
- : use the standard OpenAI SDK (base URL ) or Anthropic-format clients with a one-line model swap; works as a backend for
Cons
- Confirm plan limits and feature gates on the official pricing page
- Best results usually need correct setup and ongoing optimization
DeepSeek FAQ
Is DeepSeek open source?
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