April 2026 is the most consequential month for large language models since GPT-4's original launch. In two weeks , every major lab shipped: Claude Opus 4.7 — April 16, 87.6% SWE-Bench Verified Kimi K2.6 — April 20, 300-sub-agent swarm Qwen 3.6-27B — April 22, dense 27B GPT-5.5 — April 23, 88.7% SWE-Bench Verified, omnimodal DeepSeek V4 — April 24, 1M context, Apache 2.0 Plus Cursor 3 , Microsoft Agent Framework 1.0 , and MCP v2.1 . The density of releases broke pricing: "good enough" inference dropped roughly 50% vs January 2026 . I've been logging these for production teams. Here's what actually changed and where to spend your time.…