Claude
AnthropicA writing- and analysis-focused assistant with a large context window, project workspaces and side-by-side document previews. A free tier is available; paid plans raise usage limits.
AI Chat
Freemium
No. 06AI Chat · Coding
DeepSeek
by DeepSeek
Open-weight models with strong reasoning and coding.
The chat app is free; API usage is billed separately.
Visit deepseek.com
Official site · opens in a new tab
- Freemium
- Free web and mobile chat; paid, usage-based API access for developers.
- October 31, 2026
About DeepSeek
DeepSeek is a Chinese AI lab that has become widely known for releasing capable models with open weights and for a chat product that is free to use. Its models are particularly strong at mathematics, logic and programming tasks, and the open releases have made it a common choice for teams that want to self-host or fine-tune.
The consumer app offers a familiar chat interface with file upload, web search and a reasoning mode that shows its thinking. For developers, the API provides paid, usage-based access to the same model family. Because the models are open, there is an active ecosystem of local deployments and third-party providers.
Check the privacy policy and data-handling terms before uploading sensitive material, particularly if you are outside the regions where the service operates.
Key features
- 01
Reasoning mode
Step-by-step problem solving for maths, logic and analysis.
- 02
Coding strength
Generate, explain and debug code across common languages.
- 03
Open-weight models
Download and self-host model releases under their published licences.
- 04
File upload
Ask questions about documents and pasted content.
- 05
Web search
Ground answers in current web results.
- 06
Developer API
Paid API access with OpenAI-compatible endpoints.
Common use cases
- 01
Maths and logic
Work through problems where the reasoning matters as much as the answer.
- 02
Self-hosted AI
Run open models on your own infrastructure for privacy or cost control.
- 03
Coding assistance
Get a second opinion on an algorithm, bug or refactor.
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