DeepSeek is an AI platform offering a free chatbot and developer APIs for reasoning, writing, coding, mathematics, research, and other language-based tasks. It is known for its open-weight AI models, strong technical capabilities, and token-based API pricing.
DeepSeek
AI Chatbot & Developer APIby Hangzhou DeepSeek Artificial Intelligence Co., Ltd.
AI chatbot and developer platform for reasoning, coding, writing, and technical problem-solving.
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What is DeepSeek?
What users sayDeepSeek attracts interest for its accessible AI chat, reasoning capabilities, coding assistance, and competitively priced developer models. Users should independently assess response accuracy, privacy requirements, and the differences between available models before relying on it for important workflows.
Pros and cons
Pros
- Free AI chatbot for everyday questions and writing
- Strong reasoning and coding capabilities
- Competitive token-based developer API pricing
- Large 1 million token context window
- Supports thinking and non-thinking modes
- Open-weight research models support developer experimentation
Cons
- AI-generated answers can contain factual mistakes
- API costs depend on token usage and peak hours
- Privacy and data handling require careful review
- Some capabilities differ between Flash and Pro
- Not all DeepSeek research models are available through the official API
- No verified fixed-price premium chat subscription
Our verdict
DeepSeek is a compelling option for users who want a capable free AI chatbot and developers looking for cost-efficient reasoning and coding models. Its V4 generation offers long-context processing, agent-oriented capabilities, and flexible API access. The main trade-offs are variable usage-based pricing, model-specific feature differences, and the need to evaluate privacy requirements before using it with sensitive information.
Who is DeepSeek for?
Developers
Helps build and debug software with AI assistance
- Code generation
- Debugging
- API integration
- Guaranteed correct code
- Automatic production deployment
Plan we would pick: DeepSeek V4.1 Flash API
Software Teams
Supports development and agent workflows
- Coding agents
- Tool calling
- Long context
- Complete DevOps automation
- Security certification
Plan we would pick: DeepSeek V4 Pro API
Students
Explains academic concepts and programming problems
- Explanations
- Mathematics
- Study assistance
- Verified academic citations
- Guaranteed accuracy
Plan we would pick: DeepSeek Chat
Researchers
Helps explore technical questions and summarize information
- Reasoning
- Long-context analysis
- Technical writing
- Peer-reviewed research
- Independent source verification
Plan we would pick: DeepSeek Chat
Startups
Enables AI features in applications without fixed seat fees
- API integration
- Chatbots
- Automation
- Predictable fixed API spending
- Guaranteed uptime
Plan we would pick: DeepSeek V4.1 Flash API
Writers
Helps draft, rewrite, and organize written content
- Drafting
- Editing
- Brainstorming
- Automatic fact-checking
- Guaranteed SEO ranking
Plan we would pick: DeepSeek Chat
Industry fit
Software DevelopmentUseful for coding assistance and developer integrations.
Strong fit
96
AI Application DevelopmentStrong API compatibility and agent capabilities.
Strong fit
97
EducationHelpful for technical explanations and learning.
Strong fit
89
Technology StartupsUsage-based API is useful for building AI products.
Strong fit
94
Business OperationsUseful for AI workflows but requires integration.
Conditional
83
Content WritingSupports drafting, editing, and ideation.
Strong fit
87
Financial ResearchRequires independent data verification.
Conditional
76
HealthcareNot suitable for unverified medical decisions.
Check first
65
Legal ServicesRequires legal review and privacy assessment.
Check first
68
Key features
AI Chat
Answers questions and assists with writing, explanations, and problem-solving.
DeepSeek V4.1 Flash
Fast and cost-efficient AI model with text, agent, and vision capabilities.
DeepSeek V4 Pro
Advanced model designed for complex reasoning and agent workflows.
Thinking Mode
Provides reasoning-oriented processing for more difficult tasks.
Non-Thinking Mode
Handles simpler tasks with reduced reasoning overhead.
Coding Assistance
Helps generate, explain, debug, and refactor code.
Long Context
Supports up to 1 million tokens in the current API models.
Vision Understanding
Allows supported Flash models to process visual input.
Tool Calling
Enables developers to connect model responses with external tools.
JSON Output
Produces structured responses for application workflows.
Responses API
Supports modern API-based agent and application development.
Anthropic-Compatible API
Supports compatible integrations using the Anthropic API format.
OpenAI-Compatible API
Works with compatible OpenAI-style API clients.
Prompt Caching
Reduces input costs when eligible content is reused.
Fill-in-the-Middle
Supports compatible code-completion workflows in non-thinking mode.
DeepSeek Harness
Provides a desktop environment for model and tool interactions.
DeepSeek pricing
Prices checked October 10, 2026
Most popular
DeepSeek Chat
$0 month
- Free AI chatbot
- AI reasoning
- Coding assistance
- Writing
- Multilingual chat
DeepSeek V4.1 Flash API
Usage-based 1M tokens
- $0.15 per 1M uncached input tokens off-peak
- $0.60 per 1M output tokens off-peak
- Thinking mode
- 1M context window
- Vision support
- Tool calling
DeepSeek V4 Pro API
Usage-based 1M tokens
- $0.66 per 1M uncached input tokens off-peak
- $1.98 per 1M output tokens off-peak
- Advanced reasoning
- 1M context window
- Tool calling
Is DeepSeek right for you?
Answer a few quick questions to see our pick.
How DeepSeek compares
DeepSeek combines a free consumer AI chatbot with low-cost developer APIs and open-weight model research. Its main strengths are technical reasoning, coding, long-context processing, and flexible API compatibility. Unlike subscription-first AI products, its official developer API charges according to token usage, caching, and peak or off-peak pricing.
| Capability | DeepSeek | ChatGPT | Claude | Google Gemini |
|---|---|---|---|---|
| Free AI Chat | Yes | Yes | Yes | Yes |
| Coding Assistance | Yes | Yes | Yes | Yes |
| Advanced Reasoning | Yes | Yes | Yes | Yes |
| Developer API | Yes | Yes | Yes | Yes |
| Usage-Based API Pricing | Yes | Yes | Yes | Yes |
| Tool Calling | Yes | Yes | Yes | Yes |
| Structured JSON Output | Yes | Yes | Yes | Yes |
| Long-Context Processing | Yes | Model-dependent | Model-dependent | Model-dependent |
| Image Understanding | Model-dependent | Yes | Yes | Yes |
| Open-Weight Models | Selected models | Selected models | No | Selected models |
| Multilingual Text Generation | Yes | Yes | Yes | Yes |
Integrations
7 integrations listed
- OpenAI-compatible SDKs
- Anthropic-compatible SDKs
- OpenAI-compatible development tools
- Claude Code compatible workflows
- OpenCode compatible workflows
- OpenClaw compatible workflows
- Custom applications through REST API
Security, data & support
Security & compliance
- Account AuthenticationSupported
- API Key AuthenticationSupported
- HTTPS API AccessSupported
- Privacy PolicyAvailable
- Terms of ServiceAvailable
- SOC 2 Type IINot publicly verified
- ISO 27001Not publicly verified
- SAML SSONot publicly verified
- Enterprise Data ResidencyNot publicly verified
- Security ContactAvailable
Your data, in plain words
- DeepSeek processes prompts, conversations, account information, and technical usage information to provide its services.
- Its consumer privacy policy and developer platform terms are separate documents.
- Users should avoid submitting passwords, private customer information, or confidential business documents without reviewing the applicable privacy terms.
- DeepSeek's privacy policy identifies a China-based data controller.
- Developer applications using the API must comply with the Open Platform Terms of Service.
- Organizations should independently review data retention, privacy, and compliance requirements before production use.
Support
- Help and DocumentationAll usersSelf-service
- Email SupportUsersResponse time not publicly guaranteed
- Developer DocumentationAPI usersSelf-service
- Security ContactSecurity reportsResponse time not publicly guaranteed
API & languages
- Official APIYes
- API BillingUsage-based
- API AuthenticationAPI key
- OpenAI-Compatible EndpointYes
- Anthropic-Compatible EndpointYes
- Thinking ModeYes
- Non-Thinking ModeYes
- JSON OutputYes
- Tool CallingYes
- Responses APIYes
- Prompt CachingYes
- Vision InputFlash model only
- Context Window1 million tokens
- Flash Concurrency2500
- Pro Concurrency500
- English
- Chinese
- Hindi
- Marathi
- Bengali
- Tamil
- Telugu
- Gujarati
- Kannada
- Malayalam
- French
- German
- Spanish
- Portuguese
- Italian
- Japanese
- Korean
- Arabic
- Russian
DeepSeek supports multilingual text input and output, including English, Chinese, and many other languages. Response
DeepSeek FAQs
Is DeepSeek free?
Yes. DeepSeek provides free access to its consumer AI chatbot. Developer API usage is billed separately.
How much does DeepSeek cost?
DeepSeek Chat is free. API costs depend on the model, input and output tokens, caching, and peak or off-peak hours.
What is the latest DeepSeek model?
DeepSeek's current API lineup includes DeepSeek-V4.1-Flash and DeepSeek-V4-Pro.
What is DeepSeek used for?
DeepSeek helps with coding, reasoning, writing, mathematics, research, and building AI applications.
Is DeepSeek good for coding?
Yes. Its models support code generation, debugging, explanation, and developer agent workflows.
Does DeepSeek have an API?
Yes. DeepSeek provides a developer API compatible with OpenAI and Anthropic API formats.
Does DeepSeek support images?
DeepSeek-V4.1-Flash supports vision input. V4 Pro does not support vision input in the current API listing.
Does DeepSeek support thinking mode?
Yes. Current Flash and Pro models support thinking and non-thinking modes.
What is the context window?
The current API models support a 1 million token context window.
Can I use DeepSeek commercially?
Developer API services can be used for applications subject to the applicable terms and policies.
Does DeepSeek offer a paid chat subscription?
A fixed-price premium consumer chat subscription is not currently verified.
Are DeepSeek models open source?
DeepSeek publishes open-weight research models, but availability and licensing differ by model.
Is DeepSeek safe for confidential information?
Organizations should review its privacy policies, data handling, and security requirements before uploading sensitive information.
Does DeepSeek support multiple languages?
Yes. It can process multiple languages, although quality varies.
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DeepSeek reviews
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