DeepSeek
Frontier AI models (V4 Pro and V4 Flash) that are completely free to chat with, the cheapest to build on, and fully open source under the MIT license.
What it is
DeepSeek is a family of open source AI models and a free chat interface built by a Chinese AI lab. The flagship products are DeepSeek V4 Pro (1.6 trillion total parameters, 49 billion active per token) and DeepSeek V4 Flash (284 billion total, 13 billion active), both released in April 2026 with 1M context length. V4 Pro achieves frontier level performance rivaling top closed source models, while V4 Flash delivers near equivalent reasoning at dramatically lower cost. The consumer chat app at chat.deepseek.com is completely free, the API is the cheapest frontier option available, and every model is released under the MIT license with full weights on Hugging Face. DeepSeek is best known for its January 2025 moment when the R1 reasoning model proved that a small, self funded Chinese lab could match GPT-4 at a fraction of the cost, sending shockwaves through the AI industry.
Who it is for
Anyone who wants a capable AI chatbot without paying anything; the consumer app is completely free with no paid tiers
Developers building AI applications on a budget, where the API is the cheapest frontier option by a wide margin
Math, science, and coding tasks where DeepSeek's models are exceptionally strong on benchmarks
Open source enthusiasts and self hosters who want full model weights under the MIT license with complete control
Researchers and academics who benefit from open training methodology and published technical papers
Pros and cons
Pros
- +Frontier level model quality at 10 to 50x lower cost than Western competitors
- +Consumer chat app is completely free with generous limits, including reasoning and Deep Research
- +Fully open source under the MIT license with published weights, training code, and methodology
- +Exceptional performance on math, coding, and reasoning benchmarks; V4 Pro rivals top closed source models on agentic coding and STEM
- +DeepThink (R1 reasoning) available for free, while competitors charge $20+/month for equivalent features
- +API pricing is the lowest of any frontier model ($0.14/$0.28 per million tokens for V4 Flash), viable for high volume applications
- +Extensive ecosystem of distilled models (1.5B to 70B parameters) for running on various hardware configurations
- +Available on many third party platforms including AWS Bedrock, OpenRouter, Together AI, and Fireworks for US hosted infrastructure
Cons
- −Chat interface is basic compared to ChatGPT, Claude, or Gemini with fewer features, less polish, and no projects or workspaces
- −Data privacy concerns: servers are in China and Chinese data laws apply. Self hosting is recommended for sensitive business use
- −V4 Preview models are still being refined; some rough edges remain compared to mature Western offerings
- −No image generation, video generation, or voice mode capabilities
- −No native integrations, plugins, or app ecosystem (no MCP, no connectors)
- −Writing quality for creative and nuanced long form content is generally behind Claude
- −Occasional censorship on politically sensitive topics related to China
- −Less reliable uptime compared to established Western providers; the API has experienced capacity issues during peak demand
- −Allegations of copying from other AI models have raised questions about training methodology and intellectual property, though DeepSeek has disputed these claims
Pricing
- DeepSeek V4 Flash (Instant Mode) and V4 Pro (Expert Mode)
- DeepThink reasoning mode
- Deep Research
Prices change; check the official pricing →