DeepSeek: deepseek-v4-pro:free

DeepSeek-V4-Pro is a flagship open-source Mixture-of-Experts model designed for frontier reasoning, advanced coding, and long-context intelligence at scale (up to 1M tokens). It introduces a hybrid attention architecture that dramatically improves long-context efficiency while reducing KV and compute overhead, along with stability and training enhancements for deep multi-step reasoning. It represents a top-tier open-source system for complex agentic workflows, high-precision reasoning, and demanding production workloads.