# Cursor

- [Cursor Security Review vs. Claude Security: Two Betas, One Week, Opposite Architectures](https://sdd.sh/2026/05/cursor-security-review-vs.-claude-security-two-betas-one-week-opposite-architectures.md): On April 30, 2026, both Cursor and Anthropic shipped AI-powered security products on the same day. The features look similar on paper. The architectures could not be more different — and that difference tells you everything about where each company thinks AI coding is headed.
- [Cursor SDK: The IDE Escapes the IDE — But Does It Break the Ceiling?](https://sdd.sh/2026/04/cursor-sdk-the-ide-escapes-the-ide-but-does-it-break-the-ceiling.md): Cursor launched a TypeScript SDK in public beta on April 29 that lets developers invoke Cursor agents programmatically from CI/CD pipelines, backend services, or other products — with sandboxed cloud VMs, subagents, and durable agent lifecycle. It's Cursor's most significant architectural shift since Composer. The question is whether it actually solves the autonomy problem, or just relocates it.
- [The Flat-Rate Era Is Over: GitHub Copilot Moves to Token Billing on June 1](https://sdd.sh/2026/04/the-flat-rate-era-is-over-github-copilot-moves-to-token-billing-on-june-1.md): GitHub Copilot transitions all plans to usage-based billing on June 1, 2026. Code review will double-bill against GitHub Actions minutes. The flat-rate subscription model for AI coding tools is officially dead — and developers are not happy about it.
- [The Three-Layer AI Coding Stack That Nobody Planned (But Everyone Is Building)](https://sdd.sh/2026/04/the-three-layer-ai-coding-stack-that-nobody-planned-but-everyone-is-building.md): Cursor, Claude Code, and OpenAI Codex are not converging into a single winner-take-all tool. They are stratifying into three distinct layers — orchestration, execution, and review — and the most sophisticated developers are building workflows that use all three. Here is what each layer does, why Claude Code wins at the execution layer, and what the emergence of OpenAI's Codex plugin for Claude Code signals about where this is heading.
- [Cursor 3: Agent-First Branding, IDE-Last Architecture](https://sdd.sh/2026/04/cursor-3-agent-first-branding-ide-last-architecture.md): Cursor 3 shipped a genuinely redesigned interface built around parallel agents. The Agents Window, Design Mode, /worktree, and /best-of-n are real features with real uses. But 'agent-first' describes the UI layer, not the architecture — and the distinction matters more than Cursor's marketing suggests.
- [GitHub Copilot CLI Goes GA: Microsoft Just Admitted Claude Code Was Right](https://sdd.sh/2026/04/github-copilot-cli-goes-ga-microsoft-just-admitted-claude-code-was-right.md): GitHub Copilot CLI reached general availability on February 25 with full autopilot mode, multi-model support, and a cloud offload feature that lets you delegate to an agent mid-session. Microsoft just shipped a terminal-native agentic coding tool. The irony is deliberate.
- [Cursor Is Worth $50 Billion. Its Biggest Problem Is That It Still Needs You.](https://sdd.sh/2026/04/cursor-is-worth-50-billion.-its-biggest-problem-is-that-it-still-needs-you..md): Cursor's $50B valuation is real, its self-hosted cloud agents are a genuine enterprise product, and 67% of Fortune 500 companies are customers. But the autonomy ceiling — the fundamental limit that keeps Cursor in the IDE and humans in the loop — hasn't moved.
- [Cursor Composer 2: The Model That Learns to Forget — and Sparked a Controversy](https://sdd.sh/2026/03/cursor-composer-2-the-model-that-learns-to-forget-and-sparked-a-controversy.md): Cursor's new coding model beats Claude Opus 4.6 on key benchmarks — but the real story is a training breakthrough called compaction-in-the-loop RL, and a transparency controversy that revealed Cursor quietly built it on a Chinese open-source model.
- [Cursor Automations: Your IDE Just Became an Always-On Agent](https://sdd.sh/2026/03/cursor-automations-your-ide-just-became-an-always-on-agent.md): Cursor Automations turns your IDE into a reactive system that writes code, triages bugs, and responds to incidents while you sleep. Here's what it can do — and what it can't yet.
- [Cursor vs. Copilot vs. Claude Code vs. Windsurf: Which AI Coding Tool Wins in 2026?](https://sdd.sh/2026/03/cursor-vs.-copilot-vs.-claude-code-vs.-windsurf-which-ai-coding-tool-wins-in-2026.md): Four serious contenders, four distinct philosophies. Here's a no-nonsense breakdown of the AI coding tool landscape in 2026 — with real pricing, real benchmarks, and a decision framework that actually helps you choose. Updated May 2 with GitHub Copilot usage-based billing, Cursor SDK and Security Review beta, Claude Code v2.1.119 and $2.5B ARR, and Windsurf's Devin integration roadmap.