Google Antigravity vs OpenAI Codex
Pricing
Google Antigravity: Free for individuals with weekly limits; higher limits with Google AI Pro ($19.99/mo) or Ultra (from $99.99/mo)
OpenAI Codex: Included in ChatGPT plans (Plus $20/mo, Pro from $100/mo), limited use on Free and Go
Description
Google Antigravity: Google's agent-first coding platform: a desktop app for running several coding agents at once, plus an IDE, a CLI and a Python SDK
OpenAI Codex: OpenAI's coding agent, which works in the ChatGPT desktop app, your terminal, your editor and the cloud on your ChatGPT plan
Pros
- The free plan for individuals includes unlimited Tab completions and every product feature, including scheduled tasks and the CLI
- Run several local agents in parallel and group the conversations into projects across workspaces
- Browser-in-the-loop agents can take over repetitive front-end tasks
- Runs in the ChatGPT desktop app, the CLI, an IDE extension and on the web, all tied to one ChatGPT account
- Cloud tasks keep going after you close your laptop, in a reusable environment for each repo
- Reviews GitHub pull requests when you tag @Codex or turn on automatic reviews
Cons
- The free quota refreshes only once a week; Google AI Pro refreshes it every five hours
- Third-party models are reserved for Google AI Ultra; the other plans run on Gemini models
- You can't add your own API key to get more usage
- Free and Go plans only get limited use in the desktop app, on the smaller GPT-6 Luna model
- Plus usage is counted per five-hour window and weekly limits can also apply, and how far it goes depends on the model and the size of the task
- Running it on an API key instead of a plan drops the cloud features, such as GitHub code review and Slack
Details
Antigravity is Google’s development platform built around agents rather than an editor with a chat panel. The main app is a command centre where you start and steer several agents at once, group conversations into projects and schedule recurring messages. There is also a full IDE, a terminal CLI and a Python SDK for building your own agents on the same harness.
The free plan for individuals is the main draw. You get the agent, unlimited Tab completions and every feature without paying, within a weekly quota, which makes it easy to try next to Cursor or Claude Code.
Limits are the catch. Google sets them by available capacity and by how much work the agent does, so the number of prompts you get varies from task to task. Google AI Pro ($19.99/month) raises the limits and refreshes them every five hours, and Pro and Ultra users can buy AI credits for usage beyond the quota. Teams can get it through Google Cloud’s Gemini Enterprise, with seats from $30 a month.
Codex is OpenAI’s coding agent. You hand it a task, such as a hard-to-find bug, a refactor or a new feature, and it reads the code, makes the changes and checks its own work, using browser and computer tools where it needs them. It can run several agents in parallel, and cloud tasks carry on while your laptop is closed.
It comes with ChatGPT, so if you already pay for Plus you already have it. The same account works in the desktop app, the terminal, your editor and on iOS.
OpenAI describes Plus at $20/month as enough for a few focused coding sessions a week. Heavier use means Pro, from $100/month, which currently has no five-hour limit, or buying extra credits when you hit the limit. You can also run the CLI on an API key and pay standard API rates, which suits automation such as CI.
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