DeepSeek-R1-0528

DeepSeek R1-0528 is a May 2025 refresh of the original R1 reasoning model, refining an already strong open-weight foundation with better reasoning depth, inference efficiency, and benchmark gains. It sits in the deepseek-thinking family and continues the lineage that positions R1 as a flagship reasoning system, with this update specifically targeting improvements in logic, mathematics, and programming tasks. The model is offered under a fully open-source license with openly exposed reasoning tokens, making it unusual among top-tier reasoning systems where the chain-of-thought is typically hidden.

At the architecture level, R1-0528 is a Mixture-of-Experts model with 671 billion total parameters but only 37 billion active during any single inference pass, which keeps per-query compute manageable while preserving broad capability. Independent benchmarking coverage describes it as the most capable open-weight model of its release window, approaching the performance tier of leading closed frontier systems. Practical fit is strongest for teams that need deep, transparent reasoning on long-context problems and want full control over the weights, since the open distribution allows local deployment, distillation into smaller variants, and integration into custom pipelines without depending on a single hosted provider.