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What it is
DeepSeek is a powerful general-purpose large language model platform built for global developers, AI researchers and content creators. It delivers high-performance MoE-based LLMs with ultra-long context windows, continuously upgraded agent capabilities and developer-friendly API services. You can access free web chat experience or integrate model APIs directly into your software, without building large model infrastructure from scratch.
How to use it
Visit the official website, you can start chatting instantly on the web client with no complicated setup. For developers, create an account, generate your API key, and call the official model endpoint via standard OpenAI-compatible protocols. A small amount of code enables you to embed DeepSeek models into applications, AI agents, coding assistants and automation workflows.
The newly updated V4-Flash-0731 model can be selected directly within the developer console after release.
Core features
MoE mixture-of-experts architecture: 284B total parameters, only 13B activated parameters for low-latency inference
Native 1M-token ultra-long context window for processing full code repositories and lengthy documents
Major upgrade in V4-Flash-0731: Greatly enhanced agent performance
Surpasses previous Flash version and V4-Pro Preview on multiple professional benchmarks, excelling at terminal control, software engineering and chained multi-tool calling
Exclusive native Responses API support (new in 0731 update)
Fully compatible with Codex ecosystem and mainstream agent development frameworks
Dual reasoning modes: Fast Mode for simple queries and Thinking Mode for complex logical tasks
Official SDKs and OpenAI-compatible interface for seamless migration of existing projects
Multilingual support for UI, prompts and transaction notification emails
Use cases
Any developer or team building AI agents, coding tools, automated workflows and intelligent SaaS services. Suitable for full-stack software development, DevOps automation, cybersecurity simulation, long-document analysis, multi-step task automation and commercial AI products.
The upgraded V4-Flash version is especially recommended for creators running continuous automated AI agent tasks.
Pricing
Free web-based chat available for all visitors. Paid API billing adopts transparent token-based pricing. Higher usage quotas are available for enterprise users, billed by token consumption. The cost remains highly competitive compared with mainstream overseas large language models.
Support & company
Developed and maintained by DeepSeek AI. Official technical documentation and developer community provide ongoing guidance. Contact official support via the website for enterprise cooperation and customized technical solutions.
Login / Sign up
Simple registration with email address. You can try online chat immediately after signing up, and apply for API access within the developer console.