DeepSeek-V4 ☆

DeepSeek-V4 went live in preview on April 24, 2026 in Pro and Flash variants with API access and open weights under MIT. V4 Pro is a 1.6-trillion-parameter mixture-of-experts activating 49B per token, pairing MoE with sparse attention for a 1M-token context — and posting 80.6% on SWE-bench Verified (as reported in launch coverage), frontier-class coding from an open model. It extends the V3/R1 lineage's argument that engineering efficiency, not raw compute access, sets the pace under export controls.