DeepSeek R1 Review 2026

DeepSeek is the Chinese AI lab behind the DeepSeek-V3 and DeepSeek-R1 open-weight models — reasoning-optimized LLMs that match or beat OpenAI's o-series and Anthropic's Sonnet on math, code, and reasoning benchmarks at a fraction of the cost. DeepSeek's decision to release its models under permissive MIT-style licenses and publish detailed training methodology has reshaped the economics of frontier AI in 2025–2026.

DeepSeek burst into global awareness in early 2025 when it released DeepSeek-R1, an open-weight reasoning model that reached OpenAI-o1-tier performance on math, coding, and scientific reasoning benchmarks — while running at roughly 1/20th the API cost and shipping with an MIT license that allowed unrestricted commercial use. The release triggered a broad reassessment of frontier AI costs and pushed multiple US labs to accelerate open-weight releases in response.

DeepSeek's model line-up now includes DeepSeek-V3 (a 671B-parameter Mixture-of-Experts base model with 37B active parameters, positioned as a general-purpose chat model), DeepSeek-R1 (the flagship reasoning model with chain-of-thought and self-verification behavior similar to o1/o3), several distilled versions (7B, 14B, 32B, 70B) that let developers run reasoning models on modest hardware, and DeepSeek-Coder-V2 for programming workloads. All models are downloadable from Hugging Face and runnable on vLLM, TGI, TensorRT-LLM, and llama.cpp.