Originally published on rohitraj.tech
Week 30 of 2026 split in two: China's labs shipped trillion-parameter frontier models while the tools that run agents got a hard security look. Moonshot's Kimi K3 (2.8T params, open weights by July 27) landed at #2 behind Claude Fable 5, Alibaba previewed a 2.4T Qwen 3.8, and xAI's grok-build hit 20,982 stars in under two weeks. Meanwhile an unpatched Cursor 0-day went public after seven months, Codex started encrypting sub-agent prompts, and Claude Code quietly moved to Bun-in-Rust.
Read the full version with code samples, diagrams, and architecture details: This Week in AI Dev: Kimi K3 Lands and Cursor Springs a 0-Day (Week 30 of 2026)
More engineering notes: rohitraj.tech/en/notes
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