Episode 1: Tool Overview and Core Positioning
Horizontal Comparison and Selection Guide for Three Major AI Coding Agents (As of April 2026)
Meet the Three Main Players
| Tool | Vendor | Form Factor | Core Positioning |
|---|---|---|---|
| Claude Code | Anthropic | Terminal CLI + IDE Plugin | Engineer-focused, programmable AI coding assistant |
| Gemini CLI | Terminal CLI (Open Source) | Open, forkable multi-functional AI Agent | |
| Antigravity | Full IDE (VS Code fork) + Web | Multi-agent collaborative "Agentic IDE" |
The Quick Distinction
- Claude Code and Gemini CLI are direct competitors in terms of form factor, focusing on the "Terminal + Toolset" model. They are like having a seasoned expert living inside your terminal.
- Antigravity represents a completely different paradigm. It treats the IDE itself as the operation platform for Agents (Agentic IDE), focusing more on visualization, multi-agent scheduling, and cross-model switching.
Why do we need these tools?
Traditional "Chat AI" (like web versions of ChatGPT or Claude) belongs to the Chat Paradigm: You ask, it answers, and you are responsible for execution.
These three tools belong to the Agent Paradigm:
- Autonomy: They understand your intent and autonomously plan steps.
- Actionability: They have "hands" and "feet"—they can directly read/write files, run terminal commands, execute tests, and even operate browsers.
- Programmability: You can define their behavior through rule files, Skills, or Hooks, making them digital employees that truly understand your project standards.
Next, we will delve into their similarities and differences to help you make the smartest selection decision.