DeepSeek V4

DeepSeek V4 — explained in more detail

DeepSeek V4 was released as a preview on April 24, 2026 and is the fourth generation of the DeepSeek model family. The architecture builds on Mixture-of-Experts with a dual-mode design (Thinking / Non-Thinking) and a 1 million token context window. Weights are released under MIT license — V4-Pro is now the largest open-weight model on the market, ahead of Kimi K2.6 (1.1T) and GLM-5.1 (754B).

Variants and pricing

• DeepSeek-V4-Pro: 1.6 trillion parameters total / 49 billion active per token. API pricing: $1.74 per million input tokens, $3.48 per million output tokens.
• DeepSeek-V4-Flash: 284B total / 13B active. API pricing: $0.14 input / $0.28 output per million tokens — significantly undercutting GPT-5.4 Nano and Claude Sonnet 4.6.

Where it fits

According to DeepSeek’s own paper, V4-Pro trails the closed frontier models by roughly 3 to 6 months, though it can partially close that gap through expanded reasoning tokens. Efficiency gains over V3.2: only 27% of the single-token FLOPs and 10% of the KV cache size at 1M-token context. The official API model names deepseek-chat and deepseek-reasoner will be deprecated on July 24, 2026.

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