DeepSeek is an AI assistant providing advanced coding and reasoning capabilities through both a web-based chat interface and a developer-focused API platform.
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It features native multimodal support, large context windows, and specialized agentic workflows for complex technical tasks.
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Native image and text input processing
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One-million-token context window
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Thinking and non-thinking modes
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Agentic tool calls and API support
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MIT-licensed open-weight model availability
Freemium
The web interface and mobile application are free to use. The API follows a usage-based, two-tier pricing model (Peak/Off-Peak) based on tokens, with lower rates for cached input tokens.
Best for
High-volume coding agents, large-scale data analysis, multi-step reasoning tasks, and scenarios requiring long-context window processing.
Not ideal for
Short, simple queries where latency is the only priority, or applications that cannot accommodate the overhead of managing peak/off-peak billing cycles.
DeepSeek V4.1 Flash is an exceptionally cost-effective and capable tool for agentic workflows, especially for users who can leverage off-peak pricing and context caching to maximize efficiency.
In September 2026, DeepSeek released the V4.1-Flash model, which features an updated 552B parameter MoE architecture, native vision capabilities, and a new two-tier pricing schedule. As of November 1, 2026, standalone Search and Fetch API calls are billed per request.
As of
Is DeepSeek free?+
DeepSeek is Freemium. The web interface and mobile application are free to use. The API follows a usage-based, two-tier pricing model (Peak/Off-Peak) based on tokens, with lower rates for cached input tokens. Check the official site for current plans.
Is DeepSeek open source?+
Yes - DeepSeek is open source. The web interface and mobile application are free to use. The API follows a usage-based, two-tier pricing model (Peak/Off-Peak) based on tokens, with lower rates for cached input tokens.
How much does DeepSeek cost?+
The web interface and mobile application are free to use. The API follows a usage-based, two-tier pricing model (Peak/Off-Peak) based on tokens, with lower rates for cached input tokens. Pricing changes often - verify on the official site.
Who is DeepSeek best for?+
High-volume coding agents, large-scale data analysis, multi-step reasoning tasks, and scenarios requiring long-context window processing.
Who is DeepSeek not ideal for?+
Short, simple queries where latency is the only priority, or applications that cannot accommodate the overhead of managing peak/off-peak billing cycles.
What are the best DeepSeek alternatives?+
The closest DeepSeek alternatives on ai.dosa.dev are Claude, ChatGPT, Gemini - all listed under General-Purpose AI Assistants (with Strong Coding Capability).
Who makes DeepSeek?+
DeepSeek is developed by DeepSeek. It is listed in the General-Purpose AI Assistants (with Strong Coding Capability) category on ai.dosa.dev.
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