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Heroes of Might and Magic 3Codex vs Antigravity
OpenAI Codex and Google Antigravity are both agentic coding tools with an app, an IDE side and a command line; as of Nov 6, 2026 Antigravity is free for individuals and its Google AI Pro tier runs Gemini 4 Argon and Claude Opus 5.5, while Codex runs OpenAI's GPT-6 models and adds cloud tasks and GitHub reviews; Gemini CLI moved individual users to the Antigravity CLI on Jun 18, 2026.
Google Antigravity costs $0 for individuals, with unlimited Tab completions and basic weekly limits, while Codex runs on ChatGPT Free with the small GPT-6 Luna model and needs ChatGPT Plus ($20 a month) for its stronger models, cloud tasks and code review. Antigravity is Google's agentic coding app, IDE and command line, and since Jun 18, 2026 it is also where individual Gemini CLI users went: Gemini CLI stopped serving free, Google AI Pro and Ultra accounts that day. The surprise in a fair comparison is that Antigravity's paid tiers include Anthropic's Claude Opus 5.5, the Arena WebDev leader, beside Google's own Gemini 4 Argon. Codex's strengths are OpenAI's GPT-6 Astra and GPT-6.1 Sol, published per-plan allowances, cloud tasks and GitHub reviews. Learn more: https://ai.vi.ki/google-antigravity.
Quick facts
| Free use | Codex: ChatGPT Free, GPT-6 Luna in the desktop app; Antigravity: Individuals $0, unlimited Tab completions and Command requests, as of Nov 6, 2026 |
| Paid personal plans | Codex: Go $8, Plus $20, Pro $100 to $500; Antigravity: higher limits on Google AI Pro ($19.99) and Ultra (from $99.99) |
| Teams | Codex: ChatGPT Business $20 per user billed annually; Antigravity: Google Cloud from $30 a seat or pay as you go |
| Models | Codex: GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra, GPT-6 Luna; Antigravity: Gemini 4 Argon, Gemini 3.8 Flash, Claude Sonnet 5.5, Claude Opus 5.5 |
| Command line | Codex CLI; Antigravity CLI (Gemini CLI now serves Code Assist and API keys only) |
| Images inside the tool | Codex: ChatGPT Images, not on Free; Antigravity: Nano Banana 2 |
Verdict by task
| Task | Codex | Antigravity | Verdict |
|---|---|---|---|
| Free use | GPT-6 Luna, desktop app only | Gemini 3.8 Flash, Tab and Command unlimited | Antigravity |
| Best model at about $20 | GPT-6 Astra (limited) and GPT-6.1 Sol on Plus | Gemini 4 Argon and Claude Opus 5.5 on AI Pro | Antigravity, on Arena WebDev |
| Published limits | Message ranges per five hours | "Basic" and multiples | Codex |
| Cloud tasks and GitHub review | Codex Cloud, @codex review | Not described on the pages read | Codex |
| Command line for individuals | Codex CLI | Antigravity CLI | No reliable comparison yet |
| Bundled extras | ChatGPT chat, images, voice, Work | Gemini app, 5 TB storage, YouTube Premium Lite on AI Pro | Depends which you use |
Which has the better models?
On the independent leaderboards it depends on which Antigravity model is picked. Antigravity's paid tiers include Claude Opus 5.5 Thinking, first on Arena WebDev (Oct 27, 2026) at 1810 against GPT-6 Astra's 1773 and GPT-6.1 Sol's 1751. Google's own Gemini 4 Argon is not among the leaders on Arena's agent ranking, where it is eighth (10.53%) behind GPT-6 Astra (fourth, 14.70%) and GPT-6.1 Sol (sixth, 12.51%). On the Artificial Analysis Intelligence Index, GPT-6 Astra (max) scores 57 and Gemini 4 Argon (high) 50; a "Gemini 4 Carbon" tops that index at 60, but no Google page read on Nov 6, 2026 describes it, and it is not listed in Antigravity's models.
For general chat, Gemini 4 Argon leads: second on Arena Text at 1520, against 1476 for GPT-6 Astra. Google's own launch post gives no head-to-head with GPT or Claude models, citing only its own tests such as ERQA at 87%.
Verdict: Antigravity on paid tiers, because it offers Claude Opus 5.5; Codex over Antigravity's Gemini models for agent work. Note which models a plan gets: Gemini 4 Argon and the Claude models are not on Antigravity's free tier, and Claude needs a non-trial AI Pro.
Price and limits
Antigravity is free for individuals with "Basic weekly rate limits"; Google AI Pro at $19.99 a month gives "entry-level" agent limits and Ultra 5 or 20 times more, plus a flexible AI credit pool. Google gives no message numbers.
Codex lists Free at $0, Go at $8, Plus at $20, Pro at $100, $200 or $500, and estimates for Plus 5 to 45 GPT-6 Astra messages, 15 to 160 GPT-6.1 Sol messages or 350 to 3,000 GPT-6 Luna messages every five hours; Pro has no five-hour limit (Codex Pricing and Limits).
For API users, Gemini 4 Argon costs $2 / $10 per million tokens until Nov 30, 2026, then $4 / $20 from Dec 1; GPT-6.1 Sol costs $2 / $10 and GPT-6 Astra $10 / $50 (OpenAI API Pricing).
Gemini CLI and the Antigravity CLI
Searches for "Codex vs Gemini CLI" now land on a moved product. Gemini CLI's own README says there is "No free tier or Google AI plans" for it: free individual access and Google AI Pro and Ultra moved to the Antigravity CLI on Jun 18, 2026. Gemini CLI still serves Gemini Code Assist Standard and Enterprise, Code Assist for GitHub and older paid API keys, is Apache 2.0 licensed, and is "not optimized for Gemini 4+ models". The Codex CLI is open source too and installs with one command (How to Install Codex CLI). No source read for this page tests the Antigravity CLI against the Codex CLI.
Where each one runs
Codex runs in the ChatGPT Desktop App on macOS, Windows and Linux, the CLI, the Codex IDE Extension for VS Code, Cursor and Windsurf, Codex Cloud, the web and ChatGPT on iOS (OpenAI Codex docs), with GitHub, GitLab, Slack and Linear integrations and Codex Code Review. Antigravity is an app, an IDE and a CLI; the Antigravity pages read for this article do not describe cloud tasks, GitHub reviews or mobile use, so those are not compared.
Privacy
Personal ChatGPT plans share data for training by default, with an off switch, and Codex Business has no training on business data by default (Privacy and Data Controls). Google's data terms for Antigravity were not read for this page.
Which should you choose?
Choose Antigravity to code free with generous Tab completions, or for Claude Opus 5.5 and Gemini 4 Argon inside one Google AI Pro plan with storage and the Gemini app. Choose Codex for OpenAI's GPT-6 models, clear message allowances, cloud tasks that run while you sleep, and pull request reviews on GitHub, or if ChatGPT is already paid for. The chat assistants are compared on ChatGPT vs Gemini, and the other agents on Codex vs Claude Code and Codex vs Cursor. Learn more: https://ai.vi.ki/google-antigravity.
Frequently asked questions
Is Gemini CLI still free? Not for individuals. On Jun 18, 2026 Gemini CLI stopped serving free, Google AI Pro and Ultra accounts, which moved to the Antigravity CLI; Gemini CLI now serves Gemini Code Assist licenses and API keys.
Is Antigravity free? Yes for individuals, with unlimited Tab completions and Command requests and basic weekly limits on Gemini 3.8 Flash. Gemini 4 Argon and the Claude models need Google AI Pro or Ultra.
Can Antigravity use GPT models? Antigravity's model list on Nov 6, 2026 includes only OpenAI's open-weight GPT-OSS-120B, which Google will remove on Nov 18, 2026. GPT-6 models run in Codex.
Is Codex better than Antigravity? For agent work Codex's GPT-6 Astra ranks above Gemini 4 Argon on Arena's agent ranking and the Artificial Analysis index, but Antigravity's paid tiers also offer Claude Opus 5.5, which ranks above both. Codex adds cloud tasks and GitHub reviews.
Which is cheaper? Both have free tiers. Google AI Pro ($19.99 a month) and ChatGPT Plus ($20) cost about the same and both bundle much more than coding.
Sources
- Pricing, CLI and Codex docs, OpenAI Codex docs, read Nov 6, 2026
- Data controls, OpenAI Help Center, read Nov 6, 2026
- OpenAI Codex, OpenAI, Aug 10, 2021 (updated Apr 16, 2025)
- API pricing, OpenAI, read Nov 6, 2026
- Pricing and Models, Google Antigravity, read Nov 6, 2026
- Google AI plans, Google, read Nov 6, 2026
- Gemini CLI, Google on GitHub, read Nov 6, 2026
- Introducing Gemini 4 Argon, Google, Oct 13, 2026
- Gemini API pricing, Google AI Studio, read Nov 6, 2026
- WebDev leaderboard, Text leaderboard and Leaderboard overview, Arena, Oct 27, 2026, read Nov 6, 2026
- Models leaderboard, Artificial Analysis, read Nov 6, 2026
- Introducing the Codex app, OpenAI, Feb 2, 2026 (video)
Moments
Introducing the Codex app
OpenAI
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ChatGPT vs ClaudeChatGPT and Claude cost the same $20 a month at their main paid tier, but they win at different tasks. Claude leads the public leaderboards for writing and coding as of Nov 6, 2026, while ChatGPT makes images, has the more generous free plan and offers cheaper and pricier plans that Claude lacks.
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ChatGPT vs CopilotMicrosoft Copilot is the better buy if you want Word, Excel and PowerPoint themselves, since Microsoft 365 Premium bundles the Office apps, 2 TB of storage for up to six people and Copilot for $19.99 a month. ChatGPT Plus costs $20 a month and is the stronger AI on its own: Microsoft does not say which models consumer Copilot uses, while ChatGPT's models rank on public leaderboards.
- ChatGPT vs DeepSeekDeepSeek publishes its current models as open weights under the MIT license and sells a cheap API, but it stores data in China; ChatGPT's top models score higher on independent tests as of Nov 6, 2026 and offer images, voice and a training opt-out setting. For the cheapest capable API model the two are close, and OpenAI's GPT-6 Luna even undercuts DeepSeek's peak-hour price.
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ChatGPT vs GeminiGoogle's Gemini ranks above ChatGPT on the public chat leaderboards as of Nov 6, 2026, costs about the same at $19.99 a month for Google AI Pro, makes video and comes with storage and Google app features. ChatGPT is ahead on coding agents and gives more on its free plan, and the two are close on most everyday tasks.
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ChatGPT vs GrokChatGPT scores well above Grok on independent reasoning and coding leaderboards as of Nov 6, 2026, and lets you opt out of training. Grok, sold in The X Subscription from $8 a month with Cursor and X Premium included, makes video, which ChatGPT no longer does, and won a Tom's Guide test of everyday questions.
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ChatGPT vs PerplexityPerplexity is a search-first answer engine with a free AI browser, Comet, while ChatGPT is a general assistant that also searches, makes images and writes code. ChatGPT's free plan is more generous as of Nov 6, 2026, and no independent test has measured which one answers search questions better.
See also
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CodexCodex is OpenAI's coding agent: it reads a codebase, edits files, runs commands and tests, reviews pull requests and works in the cloud. As of Nov 6, 2026 it lives inside the ChatGPT desktop app, in the Codex CLI, in IDE extensions, in Codex Cloud and on mobile, and every ChatGPT plan includes some of it, Free and Go too.
- GPT-6 LunaGPT-6 Luna is OpenAI's cheapest and fastest GPT-6 model, released Sep 22, 2026 at $0.10 per million input tokens and $0.50 output. OpenAI's pricing page and Oct 7 release note name it as ChatGPT's model for Free and Go, though its help articles say GPT-5.6 Luna.
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Codex Pricing and LimitsCodex comes with every ChatGPT plan as of Nov 6, 2026: Free ($0) and Go ($8) get GPT-6 Luna in the desktop app, Plus ($20) gets about 15 to 160 GPT-6.1 Sol messages per five hours plus Codex Cloud, and Pro ($100, $200 or $500) has no five-hour limit. Credits extend any plan, and an API key bills by the token instead.
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OpenAI API PricingOpenAI API prices are per 1M tokens: GPT-6 Astra costs $10 input and $50 output, GPT-6.1 Sol $2 and $10, GPT-6.1 Terra $1 and $5, and GPT-6 Luna $0.10 and $0.50, as of Nov 6, 2026. Batch and Flex halve those prices, Fast doubles them.