# DeepSeek

> Open-weights AI models and chat interface for reasoning, coding, and research.

DeepSeek develops open-source frontier large language models, including reasoning (R1) and general-purpose architectures. It provides a free web and mobile chat interface alongside a low-cost developer API. It is notable as an open, accessible alternative to proprietary reasoning models like OpenAI's o1 and ChatGPT.

Website: https://deepseek.com/

## What it is for

- Work through complex math, logic, and reasoning problems using the DeepThink mode
- Generate, debug, and review software code across multiple languages
- Search and synthesize research topics with web-augmented generation
- Integrate open-weights LLMs into applications via an API

## Features

- DeepThink chain-of-thought reasoning mode
- Open-weights frontier LLM models (R1, V-series, Coder)
- Web search integration for up-to-date queries
- Developer API platform with token-based pricing
- Web interface, desktop harness, and mobile apps

## Pricing

Freemium. Free web and app chat; pay-as-you-go API usage

## Details

- Type: AI model
- Category: [AI](https://xiry.app/topics/ai.md)
- Topic: [AI Chatbots](https://xiry.app/topics/ai/ai-chatbots.md)
- Open source: yes
- Platforms: Web, iOS, Android, API, macOS, Windows
- For: Developers, researchers, students, and anyone needing reasoning or coding assistance
- Alternative to: ChatGPT, Claude, OpenAI o1
- Tags: llm, reasoning, coding, open source, ai chat, deepseek

## Why it was saved

- [@futurewalt.ai, 20 March 2025](https://www.instagram.com/reel/DHbPApohWI1/): Presented as a free research and reasoning alternative to paid ChatGPT.

## Compare

- [Alternatives to Claude](https://xiry.app/alternatives/claude.md)
- [Alternatives to ChatGPT](https://xiry.app/alternatives/chatgpt.md)

## Related

- [CustomGPT.ai](https://xiry.app/resources/customgpt-ai): No-code platform building custom AI chatbots from website sitemaps and business documents (Web app, Paid)
- [DeepSeek Chat](https://xiry.app/resources/deepseek-chat): Conversational AI assistant with open-weights reasoning and general language models (Web app, Freemium)
- [Google Gemini](https://xiry.app/resources/google-gemini): Conversational AI assistant built on Google's large language models (Web app, Freemium)
- [Vercel Chat SDK Patterns and Code Snippets](https://xiry.app/resources/vercel-chat-sdk-patterns-and-code-snippets): Code patterns for building cross-platform chat bots with Vercel Chat SDK (Tip, Open source)
- [DeepSeek-R1](https://xiry.app/resources/deepseek-r1): Open-source reasoning model rivaling proprietary models in math, code, and logic (AI model, Open source)
- [DeepSeek-V3](https://xiry.app/resources/deepseek-v3): Open-weight 671B mixture-of-experts language model matching proprietary frontier systems (AI model, Open source)

Updated 3 October 2026. Page: https://xiry.app/resources/deepseek

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