Overview
- Tool Name: DeepSeek
- Developer: DeepSeek (Hangzhou DeepSeek Artificial Intelligence Basic Technology Research Co., Ltd.)
- Official Website: https://deepseek.com/
- Category: AI Chatbots
- Main Models: deepseek-flash (DeepSeek-V4.1-Flash, with image understanding) and deepseek-v4-pro (DeepSeek-V4-Pro-0813), both with a 1M context window
DeepSeek is an AI chat assistant and open-source large language model suite from a Hangzhou-based AI research company. Its official website offers a web app, a mobile app, and an API platform for developers. The current flagship model, DeepSeek-V4.1-Flash, brings stronger text and agent performance plus native multimodal vision. The Research section on the official website also lists technical material for DeepSeek V4.1, V4, V3.2, V3.1, R1, and V3.
Main Uses
- Conversational AI: Supports multi-turn dialogues and can switch between non-reasoning and reasoning (thinking) modes to answer general knowledge, scientific, and historical queries.
- Code Generation & Debugging: Assists in writing, explaining, optimizing, and troubleshooting code across multiple programming languages.
- Content Creation & Processing: Helps users draft articles, organize outlines, translate text, polish prose, and generate summaries.
- Long-Document & Large-Codebase Handling: With a 1M context window and up to 384K output tokens, it can process very long documents, code repositories, or large-scale data analysis in one pass.
- Image Understanding (Multimodal): deepseek-flash accepts JPEG, PNG, GIF, and WebP images for describing pictures, reading text from screenshots, and analyzing charts.
- API Integration: Enables developers to integrate DeepSeek models into third-party applications and workflows through an API compatible with both OpenAI and Anthropic formats.
Applicable Scenarios
- Daily Office Productivity: Professionals can use it to draft emails, write reports, and organize meeting minutes to boost writing efficiency.
- Software Development: Programmers and students can leverage its coding capabilities to accelerate development cycles or learn new algorithms.
- Academic & Learning Support: Researchers and students can utilize it to brainstorm research ideas and clarify complex concepts.
- Coding Assistant Integration: In tools such as Claude Code, GitHub Copilot, and OpenCode, DeepSeek can be used directly as the backend model.
Usage Recommendations
- Provide Clear Prompts: Supply specific context, format requirements, and target outcomes when asking questions to get more accurate responses.
- Choose the Model by Task: Use deepseek-flash for image understanding and multimodal input, and deepseek-v4-pro for stronger reasoning and coding.
- Explore API Integration: Developers can call the API with the OpenAI-format base_url https://api.deepseek.com or the Anthropic-format base_url https://api.deepseek.com/anthropic, reusing the official SDKs.
- Follow Open Source Updates: Developers and tech enthusiasts can track its open-source model releases and technical reports in the community.
Limitations & Precautions
- Hallucination Risk: Large language models may occasionally generate plausible-sounding inaccuracies; critical information should always be verified manually.
- Service Stability: Accessing the web interface or API may be affected by network conditions, and response times can fluctuate during peak hours.
- Data Privacy: Users are advised to avoid inputting sensitive data such as trade secrets or personal privacy into the chat interface.
- Model Capability Differences: Image understanding is available only on deepseek-flash; deepseek-v4-pro does not accept image inputs.
- Billing Periods & Concurrency Limits: API pricing varies by time window; Beijing time Monday to Friday, 9:00-12:00 and 14:00-18:00 (excluding public holidays) count as peak hours priced roughly double the off-peak rate. Concurrency limits are 2,500 for deepseek-flash and 500 for deepseek-v4-pro.
Frequently Asked Questions
Is DeepSeek free to use?
The web app and the mobile app are free to use, while the API platform for developers is billed by token usage, with off-peak prices about half of peak prices (peak hours: Beijing time Monday to Friday, 9:00-12:00 and 14:00-18:00, excluding public holidays).
How can I start using DeepSeek?
Regular users can visit the official website (https://deepseek.com/) to use the web app or scan the QR code to download the DeepSeek App. Developers can apply for an API key on the API platform and follow the API docs at https://api-docs.deepseek.com/.
Does DeepSeek offer open-source models?
The Research section of the official website lists technical material for DeepSeek V4.1, V4, V3.2, V3.1, R1, and V3. Model weights for earlier versions such as DeepSeek V3 and R1 were released in the open-source community; check the official documentation for the current licenses and downloads.
What programming languages does DeepSeek support for coding?
It supports major programming languages such as Python, JavaScript, C++, and Java for code generation and debugging, fulfilling most standard software development needs.
Which models does DeepSeek offer, and how long is the context window?
The API currently provides two models, deepseek-flash (based on DeepSeek-V4.1-Flash) and deepseek-v4-pro, both with a 1M context window and up to 384K output tokens.
Can DeepSeek be integrated into coding assistants or agent tools?
Yes. The API is compatible with OpenAI and Anthropic formats, so DeepSeek can be used directly as the backend model in tools such as Claude Code, GitHub Copilot, and OpenCode. The official website also offers DeepSeek Harness in developer preview for agent developers.