Codex CLI vs Antigravity
OpenAI's open-source terminal coding agent vs Google's agent-first AI coding IDE.
Updated June 30, 2026 · Independent comparison — Codex CLI and Antigravity are separate products.
Codex CLI
OpenAI's open-source terminal coding agent
Codex CLI is OpenAI's open-source, Rust-based terminal coding agent. It runs in your shell, edits local repos with configurable approval modes and sandboxing, supports MCP and AGENTS.md, and extends into an IDE extension and Codex Cloud tasks. It's billed through ChatGPT plans or an OpenAI API key.
Antigravity
Google's agent-first AI coding IDE
Antigravity is Google's agent-first desktop IDE, launched November 2025. Rather than a single terminal agent, it centers on an Agent Manager that runs and supervises multiple agents across an editor, terminal, and integrated browser, returning plans, screenshots, and "artifacts." It's multi-model (Gemini 3, Claude Sonnet/Opus, gpt-oss-120b) with a free preview tier plus Google AI Pro/Ultra limits. Google also ships a companion Antigravity CLI (the `agy` command) that replaced Gemini CLI for consumers in June 2026.
Bottom line
OpenAI's open-source terminal coding agent vs Google's agent-first AI coding IDE. Choose Codex CLI if you want a lightweight, scriptable terminal agent that fits shells and CI; choose Antigravity if you want a full agent-first IDE with a visual Agent Manager.
Pricing
| Feature | Codex CLI | Antigravity |
|---|---|---|
| Free tier to start | Limited (ChatGPT Free) | Free preview tier |
| Entry paid plan | ChatGPT Go $8 / Plus $20/mo | Google AI Pro ~$20/mo |
| Higher-usage plan | ChatGPT Pro $200/mo | Google AI Ultra ~$100–$200/mo |
| Usage-based API billing | OpenAI API pay-as-you-go | Plan limits + credit overages |
| Account required | ✓ | ✓ |
Models
| Feature | Codex CLI | Antigravity |
|---|---|---|
| Model roster | GPT-5.x-Codex / o-series (OpenAI) | Gemini 3, Claude Sonnet/Opus, gpt-oss-120b |
| Multi-vendor models | ✗ | ✓ |
| Coding-optimized model | GPT-5-Codex | Gemini 3 Pro (+ Claude) |
| In-session model switching | ✓ | ✓ |
| Bring-your-own model key | OpenAI API | Plan-managed |
Agent Experience
| Feature | Codex CLI | Antigravity |
|---|---|---|
| Primary interface | Terminal CLI | Desktop IDE |
| Multi-agent orchestration | Subagents + Codex Cloud | Visual Agent Manager |
| Integrated browser | Via MCP / tools | Built-in |
| Review artifacts | Terminal diffs and logs | Plans, screenshots, artifacts |
| Approval / trust controls | Approval modes + sandbox | Per-agent permissions in IDE |
Developer Workflow
| Feature | Codex CLI | Antigravity |
|---|---|---|
| Scriptable / non-interactive | ✓ | IDE-first (companion agy CLI) |
| IDE integration | Codex IDE extension | Native IDE |
| Async / background tasks | Codex Cloud | Background agents |
| Project instructions | AGENTS.md | Workspace / agent config |
| Best fit | Terminal & CI workflows | Visual multi-agent building |
Platforms & Openness
| Feature | Codex CLI | Antigravity |
|---|---|---|
| Open-source | Apache-2.0 CLI | ✗ |
| Form factor | Terminal CLI | Desktop app |
| Platforms | macOS, Linux, Windows | macOS, Windows, Linux |
| MCP support | ✓ | ✓ |
| Vendor ecosystem | OpenAI / ChatGPT | Google / Gemini |
The Verdict
Choose Codex CLI if...
- ✓You want a lightweight, scriptable terminal agent that fits shells and CI
- ✓You want an open-source (Apache-2.0) tool you can inspect and extend
- ✓You already pay for ChatGPT or prefer OpenAI API billing
- ✓You value explicit approval modes and sandboxing for local edits
- ✓You'd rather stay in the terminal than adopt a full IDE
Choose Antigravity if...
- ✓You want a full agent-first IDE with a visual Agent Manager
- ✓You want multi-model choice (Gemini, Claude, gpt-oss) in one app
- ✓You want an integrated browser, screenshots, and artifacts for review
- ✓You prefer supervising several agents visually over one terminal loop
- ✓You're comfortable with a proprietary Google app and AI-plan quotas
Frequently Asked Questions
What is the difference between Codex CLI and Antigravity?
Codex CLI is OpenAI's open-source, Rust-based terminal coding agent. Antigravity is Google's agent-first desktop IDE, launched November 2025.
How much do Codex CLI and Antigravity cost?
Codex CLI: ChatGPT Go $8 / Plus $20/mo. Antigravity: Google AI Pro ~$20/mo. See the pricing table above for full plan details.
Should I choose Codex CLI or Antigravity?
Choose Codex CLI if you want a lightweight, scriptable terminal agent that fits shells and CI. Choose Antigravity if you want a full agent-first IDE with a visual Agent Manager.
1DevToolRun both — and more
Torn between Codex CLI and Antigravity? 1DevTool is a multi-agent workspace that runs Codex CLI, Claude Code, Cline, OpenCode, and any CLI agent side by side in persistent terminals — bring your own keys or subscriptions, no lock-in. It adds a built-in HTTP client, 13-engine database client, and embedded browser, all wired into Send-to-AI. One-time $29, no subscription.