What is DeepSeek API?
DeepSeek API is a production-ready developer interface to DeepSeek-AI’s family of open-source large language models.
Key capabilities
- OpenAI-style endpoints (
/chat/completions,/completions) so existing OpenAI SDKs work out-of-the-box. - Multiple models:
deepseek-chat(V3-0324),deepseek-reasoner(R1-0528) and coder variants. - Advanced features: JSON-formatted output, function calling, chat-prefix completion, Fill-in-the-Middle (FIM) completion, context caching and up to 8K tokens.
- Pay-as-you-go pricing with off-peak discounts and transparent token accounting.
- MIT-licensed model weights plus open benchmark reports encourage fine-tuning and on-prem deployment.
Why use it?
Developers who need cost-effective, reasoning-strong LLMs can switch a single base URL to migrate from the OpenAI API while gaining access to DeepSeek’s rapid feature releases and open-source ethos.
Typical use cases
- Chatbots and virtual assistants
- Code generation & review pipelines
- Structured data extraction via JSON mode
- Tool-calling / agentic workflows via function calling
- Long-form generation thanks to 8K token context
