DeepSeek has released the production version of its flagship model, DeepSeek V4 Pro, ending a preview period that ran nearly four months. The build, designated V4 Pro 0813, appeared on August 12, 2026, as the general-availability release on OpenRouter’s model page, and DeepSeek’s own API documentation now lists DeepSeek-V4-Pro-0813 as the model version behind the deepseek-v4-pro endpoint. The API economics carry over from preview: $0.435 per million input tokens on a cache miss, $0.003625 per…