Executive Summary
On April 24, 2026, DeepSeek released V4, its fourth-generation large language model, representing a significant leap in efficient AI architecture design. The model introduces a hybrid attention mechanism combining Chunked Shared Attention (CSA) and Hash-based Chunked Attention (HCA), a novel Mixture-of-Experts configuration with 384 experts, and aggressive KV cache compression that enables 1 million token context windows on commodity hardware.
V4-Pro Parameters
1.6T total
49B active per forward pass
V4-Flash Parameters
284B total
13B active per forward pass
Context Window
1M tokens
Both Pro and Flash variants
V4-Pro Pricing
$1.74/M input
$6.94/M output tokens
V4-Flash Pricing
$0.14/M input
$0.55/M output tokens
Launch Date
Apr 24, 2026
Open-weight release
Key Innovations
CSA/HCA Hybrid Attention
mHC Residual Connection
Muon Optimizer
384 MoE Experts (6+1 active)
TileLang Kernel DSL
GRPO Post-Training
FP4 Quantization
Multi-Latent Attention (MLA)