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Google Antigravity vs OpenAI Codex

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Entry price
Google Antigravity from $30/seat/mo, OpenAI Codex from $8/mo — different billing units, so no direct winner
Free plan
Both have one
Public API
Both have one
Best fit
Google Antigravity: Former Gemini CLI users who need a supported terminal agent · OpenAI Codex: ChatGPT subscribers who want a coding agent included in their plan
Platforms
Google Antigravity: macOS, Windows, Linux · OpenAI Codex: Web, macOS, Windows, Linux, iOS, VS Code extension

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Google AntigravityGoogle's agent-first coding platform: a desktop agent manager, terminal CLI, Python SDK and IDE built around Gemini models.OpenAI CodexOpenAI's coding agent for the terminal, IDE, desktop and cloud sandboxes, included with ChatGPT plans or billed by API tokens.

Side by side

FactGoogle AntigravityOpenAI Codex
CategoryAI Code Editors & IDEsAI Coding Assistants
Pricing modelFreemiumFreemium
Starts at$30/seat/mo$8/mo
Public APIYesYes
Trust score86 / 10084 / 100
PlatformsmacOS, Windows, Linux, APIWeb, macOS, Windows, Linux, iOS, VS Code extension, API
CompanyGoogle LLCOpenAI
Launched20252025
Last verifiedOct 2, 2026Oct 2, 2026

What our research says

Google Antigravity

Worth trying for developers who want Google's own agent stack across a desktop manager, terminal and IDE, especially anyone who relied on Gemini CLI and has to move. The free tier is enough to evaluate it, but heavy daily use points to a Google AI or enterprise plan. Teams standardized on another vendor's agent have little reason to switch yet.

Pros

  • Free individual tier that includes the CLI and the IDE
  • Four surfaces share one agent harness: desktop app, CLI, SDK and IDE
  • Business route through Google Cloud with spend caps and admin controls
  • Python SDK for building custom agents

Cons

  • Free tier uses weekly rate limits that are not quantified
  • Pro and Ultra pricing is not shown on the Antigravity site
  • Gemini CLI users were given a short migration window when it was retired

OpenAI Codex

Codex is the obvious pick if you already pay for ChatGPT and want an agent that can work in your terminal or off in a cloud sandbox without a second subscription. It is less compelling if you want a polished editor-native experience or need predictable monthly spend at heavy usage.

Pros

  • The command-line agent is open source under Apache-2.0
  • Free and Go tiers let you try it before paying for a bigger plan
  • Same agent is reachable from terminal, IDE extension, desktop app and cloud tasks
  • Can sign in with a ChatGPT plan or an API key, whichever billing suits you

Cons

  • Usage limits on subscription plans vary by model, task and local versus cloud runs, so capacity is hard to predict
  • Top-tier usage requires the higher Pro plans, which start at $100/month
  • Surfaces and plan names change often, so docs and pricing pages move around

Which one fits

Choose Google Antigravity if you need

  • Former Gemini CLI users who need a supported terminal agent
  • Developers who want to run several agents in parallel from one desktop app

Choose OpenAI Codex if you need

  • ChatGPT subscribers who want a coding agent included in their plan
  • Developers delegating well-scoped tasks and reviewing the resulting diffs
  • Teams that want automated pull-request review in GitHub

Google Antigravity vs OpenAI Codex: the questions people ask

Is Google Antigravity cheaper than OpenAI Codex?

They charge in different units, so there is no like-for-like answer: Google Antigravity starts at $30/seat/mo, OpenAI Codex at $8/mo. Entry price is the lowest paid plan as we last verified it.

Does Google Antigravity or OpenAI Codex have a free tier?

Both: Google Antigravity has a free tier, and OpenAI Codex has a free tier.

Which has a public API, Google Antigravity or OpenAI Codex?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

All Google Antigravity alternatives →All OpenAI Codex alternatives →Browse all AI Code Editors & IDEs →