DeepSeek
DeepSeek is a 671 B parameter open-source AI reasoning model for advanced logic and mathematical operations. It was released in January 2025 under an MIT license and performs at or above GPT-4 levels in benchmarks such as MATH-500 and SWE-bench. It is free on Hugging Face or via a low-cost API (90–95 % less expensive than alternatives), with complete transparency and customizability. Suitable for researchers and organizations that require high-performance, reliable analytics.