tools
DeepSeek - Open-Source Reasoning AI | AI.info
DeepSeek R1 and V3 are frontier open-source AI models matching GPT-4 class performance. Free web interface plus low-cost API access.
DeepSeek provides web and mobile chat with writing help, coding assistance, question answering, web search, Deep-Think reasoning, file uploads, text extraction, and synchronized chat history. Its current services also support multimodal understanding and long-context conversations.
The chat service is free to use. API access is billed by token usage, with separate peak and off-peak rates. The website could not be opened during this search because it returned HTTP 403.
Features
- Answer questions and assist with writing, coding, research, and explanations
- Search the web for information
- Use Deep-Think reasoning mode
- Upload files and extract text
- Support native visual understanding
- Support up to 1M tokens of context
- Provide API access with tool calls, JSON output, and Responses API support
- Sync chat history across supported platforms
Use cases
- Draft and revise emails, documents, and other written content
- Explain code and help solve programming problems
- Research topics and summarize web information
- Analyze uploaded files and images
- Work through difficult reasoning and mathematics problems
- Integrate AI responses into applications through the API
Pros
Cons
Pricing
- Starting price
- $0.003 per 1M input tokens (cache hit, off-peak)
- Pricing checked
- 2026-09-19
deepseek-flash
$0.003 per 1M input tokens (cache hit, off-peak); $0.15 per
- DeepSeek-V4.1-Flash
- Peak rates are double off-peak rates
- Supports vision, tool calls, JSON output, and Responses API
deepseek-v4-pro
$0.022 per 1M input tokens (cache hit, off-peak); $0.66 per
- DeepSeek-V4-Pro-0813
- Peak rates are double off-peak rates
- Supports tool calls, JSON output, and Responses API