DeepSeek V4 Pro 0813 is the general-availability release of DeepSeek's flagship open-weight Mixture-of-Experts model, succeeding the April 2026 preview. It features 1.6 trillion total parameters with 49 billion activated per token, and supports a one-million-token context window. The model delivers state-of-the-art performance among open models on advanced reasoning, coding, STEM tasks, and autonomous agent workflows, with additional post-training improvements for code generation and agentic behavior over the preview release.