Antigravity is cheaper at $19.99/mo, against $20/mo.
Google's AI-native IDE with deep Gemini integration
OpenAI's coding agent: CLI + autonomous cloud PRs
Antigravity is the cheapest serious way to run an agentic IDE, free for individuals with weekly rate limits and paid headroom bought through a Google AI subscription, while Codex is the better bet if you already pay for ChatGPT and want one OpenAI agent across the terminal, the cloud and whatever editor you use.
| Attribute | Antigravity | Codex |
|---|---|---|
| Form factor | Agentic IDE plus a CLI, with an agent manager as the primary view | CLI, web, cloud and iOS, plus an extension that drops into your existing editor |
| Entry price | $0/mo Individual, basic weekly rate limits | Free tier, then $20/mo ChatGPT Plus |
| Paid headroom | Google AI Pro at $19.99/mo, Google AI Ultra at $99.99/mo for 5x Pro or $199.99/mo for 20x Pro | ChatGPT Pro at $100/mo for 5x Plus or $200/mo for 20x Plus |
| Models | Gemini 3.1 Pro, Gemini 3.6 to 3.8 Flash, Claude Sonnet and Opus 4.6, gpt-oss-120b | OpenAI only: GPT-6 Astra, GPT-5.6 Sol, Terra and Luna, plus Codex-Spark on Pro |
| Team or org billing | Organization plan runs on consumption-based API pricing through a Google Cloud project | ChatGPT Business at $20/user/mo billed annually, $25 billed monthly |
Antigravity is the cheapest serious way to run an agentic IDE, free for individuals with weekly rate limits and paid headroom bought through a Google AI subscription, while Codex is the better bet if you already pay for ChatGPT and want one OpenAI agent across the terminal, the cloud and whatever editor you use.
Yes for individuals. Google's pricing page lists an Individual plan at $0/month with unlimited Tab completions and unlimited Command requests, subject to basic weekly rate limits. Higher rate limits come from a Google AI subscription: AI Pro at $19.99/mo gives entry rate limits to the agent model in Antigravity, and AI Ultra at $99.99/mo or $199.99/mo raises them further. Organizations bill consumption-based API pricing through a Google Cloud project instead.
Antigravity if you want a full agentic IDE and the lowest entry cost, Codex if you already pay for ChatGPT and want one OpenAI agent in the terminal, the cloud and your current editor, Claude Code if you want the terminal agent with the most mature MCP and subagent story. Antigravity is the only one of the three that ships the editor itself; the other two attach to whatever editor you already run.
Antigravity at the entry point: $0/mo for the Individual plan against $20/mo for ChatGPT Plus, though Codex is also usable on the ChatGPT Free plan and, for a limited time, on the $8/mo ChatGPT Go plan. At the top the two are close, $199.99/mo for Google AI Ultra's 20x tier against $200/mo for ChatGPT Pro 20x, and both of those subscriptions buy far more than the coding agent.
Yes, and it is a common setup. Codex ships as an editor extension, so nothing stops you keeping Antigravity as the IDE and calling Codex for the tasks where you want OpenAI's reasoning models. The published extension targets VS Code, Cursor and Windsurf, so treat Antigravity support as untested rather than promised.
Google's AI-native IDE with deep Gemini integration. It sits in the ai ides category, and ships in 1 tested stack here.
OpenAI's coding agent: CLI + autonomous cloud PRs. It sits in the coding agents category, and ships in 1 tested stack here.
They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.
Beyond each other, Antigravity's closest alternatives are Cursor, Claude Code, Windsurf. Codex's closest alternatives are Claude Code, Cursor, GitHub Copilot, Windsurf.
