DeepSeek 正式发布并开源 DeepSeek-V4 Preview，主打低成本 1M 上下文长度。其中 DeepSeek-V4-Pro 为 1.6T 总参数、49B 激活参数，官方称性能可对标顶级闭源模型；DeepSeek-V4-Flash 为 284B 总参数、13B 激活参数，定位快速经济。
DeepSeek 官方公布 V4 两个版本的参数规模与 1M 上下文，可据此判断开源模型在长上下文上的成本位置。
🚀 DeepSeek-V4 Preview is officially live & open-sourced! Welcome to the era of cost-effective 1M context length.
🔹 DeepSeek-V4-Pro: 1.6T total / 49B active params. Performance rivaling the world's top closed-source models.
🔹 DeepSeek-V4-Flash: 284B total / 13B active params. Your fast, efficient, and economical choice.
Try it now at http://chat.deepseek.com via Expert Mode / Instant Mode. API is updated & available today!
📄 Tech Report: https://huggingface.co/deepseek-ai/DeepSeek-V4-Pro/blob/main/DeepSeek_V4.pdf
🤗 Open Weights: https://huggingface.co/collections/deepseek-ai/deepseek-v4
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来源：DeepSeek · x.com