Codex vs Claude Code vs Antigravity CLI: Which Terminal Agent Wins?

Three Agents, Three Philosophies

Terminal agents have become the default way to delegate real engineering work. The three most important options in late 2026 are OpenAI Codex CLI, Anthropic Claude Code, and Google Antigravity CLI. All three can read a repository, edit multiple files, run commands, and iterate on failures. The differences are in access, model behavior, and how much control you retain.

Quick Comparison

OpenAI Codex CLI

Codex is the most natural choice if your team already pays for ChatGPT Plus, Pro, Business, or Enterprise. It installs with a single shell command, authenticates through ChatGPT, and works well for well-scoped tasks: fixing a failing test, adding a route, or migrating a component.

Strengths:

• Strong code-focused models and fast iteration
• Clean approval flow before file writes and commands
• Good support for parallel workstreams

Trade-offs:

• No meaningful free tier
• Usage limits depend on your ChatGPT plan
• Best experience assumes you are comfortable in a terminal

Anthropic Claude Code

Claude Code is the most mature terminal agent for deep, multi-file work. It excels when a task requires understanding a large codebase, respecting architectural conventions, and making coordinated changes across many files. Its MCP integration is excellent, and the agent is particularly good at explaining its reasoning before acting.

Strengths:

• Excellent long-context reasoning over repositories
• Rich MCP ecosystem and hooks
• Strong review discipline with per-change approvals

Trade-offs:

• Requires a paid Claude plan or API credits
• Heavy usage can hit plan limits quickly
• Premium pricing at the top tiers

Google Antigravity CLI

Antigravity is the newest of the three and the only one with a genuinely usable free tier. A personal Google account gets you Gemini-powered agents in the terminal, plus access to the Antigravity IDE and desktop app. For students, hobby projects, and teams already on Google Cloud, it is hard to beat on value.

Strengths:

• Free with a personal Google account
• One platform across CLI, IDE, and desktop
• Strong Gemini models and Google Cloud integration

Trade-offs:

• Newer ecosystem and fewer community extensions
• Free-tier rate limits can interrupt long sessions
• Tooling conventions are still settling

How to Choose

Choose Codex if you already pay for ChatGPT and want a fast, reliable terminal agent with minimal setup. Choose Claude Code if your work is dominated by large refactors, complex debugging, or MCP-connected internal tools, and you are willing to pay for depth. Choose Antigravity if you want frontier capability without a subscription, or if your stack is built on Google Cloud.

Many developers keep two installed. A common pattern is Antigravity for exploration and free-tier work, then Claude Code or Codex for high-stakes changes where model quality and reliability matter most.

Install All Three

The AI Launchpad on Tecrese has copy-paste commands for every platform, including Windows PowerShell variants. Start there, then benchmark each agent on the same task in your own repository. Your codebase is the only benchmark that matters.