TL;DR




DeepSeek V4 shipped April 24, 2026 in two flavours: V4-Pro (1.6T MoE / 49B active) and V4-Flash (284B MoE / 13B active). Both expose a 1M-token context and ship under the MIT license.
V4 ties Claude Opus 4.6 on MCPAtlas Public (73.6) and beats GPT-5.4 on Codeforces — the best open-weight model for MCP agents in 2026.
Both OpenAI and...