DeepSeek

Chinese AI lab shipping open-weight reasoning models that punch well above their API price.

Freemium· Free web chat; API priced per million tokens (significantly cheaper than GPT/Claude)CodingDeepSeek R1, V3, V2, Coder V2, VL

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Best for

Pick DeepSeek if you want frontier-class reasoning or coding at a fraction of OpenAI/Anthropic pricing, or want open weights you can self-host.

Skip if

Skip it if your organization cannot route data through Chinese infrastructure or needs a vendor with enterprise compliance certifications.

DeepSeek is the Hangzhou-based AI lab behind a family of open-weight large language models, including the reasoning-focused R1, the general-purpose V3, the code-specialized Coder V2, and vision-language and math variants. The company runs a free chat interface at chat.deepseek.com and exposes the same models through an OpenAI-compatible API, with the V4 preview adding stronger agent and tool-use capabilities. R1 in particular put DeepSeek on the map by matching frontier reasoning benchmarks at a fraction of the cost.

What differentiates DeepSeek is the combination of permissive open-weight releases on GitHub and Hugging Face with first-party hosted inference that is dramatically cheaper than US frontier labs. That makes it attractive to developers who want to prototype against a hosted endpoint, then self-host the same weights for production, plus researchers who need to inspect or fine-tune the model. The trade-off is the usual one for any China-hosted API: data residency, censorship of politically sensitive topics, and shifting export-control optics that some enterprises will not tolerate.

The ecosystem now includes broad third-party support, fine-tuning recipes, and quantized community builds that run on consumer GPUs. For teams comfortable routing prompts to a Chinese endpoint, or willing to self-host the weights, DeepSeek is one of the strongest open reasoning options available.

Editor's take

DeepSeek is the most credible open challenger to closed frontier models right now, and R1 changed the conversation about how cheap good reasoning can be. We use it as a price-performance baseline. Just be clear-eyed about the geopolitical and data-handling tradeoffs before piping production traffic through the hosted endpoint.

— The AI Tool Bible editorial team