Side-by-side comparison · Coding & Dev Tools
Factory vs Google Antigravity vs OpenAI Codex
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Software teams that want AI agents to take tickets off the backlog and come back with finished pull requests.
Pick it if: Google AI Pro subscribers, and anyone who wants to try handing coding work to AI agents for free.
Pick it if: ChatGPT subscribers who want a coding agent without paying for a second subscription.
Overview
| Attribute | Factory | Google Antigravity | OpenAI Codex |
|---|---|---|---|
| In one line | AI coding agents called Droids that take on whole engineering tasks from your backlog. | Google's free coding app. You hand tasks to AI agents and review what they produce. | OpenAI's coding agent. Hand it a task and it works away while you do other things. |
| Pricing model | Paid | Freemium | Freemium |
| Starting price | $20/mo | $19.99/mo | $8/mo |
| Free plan | No | Yes | Yes |
| Works with Claude Code | Yes | No | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Factory | Google Antigravity | OpenAI Codex |
|---|---|---|---|
| Overall rating | 3.8 | 3.9 | 4.2Winner |
| Ease of useHow quickly someone non-technical gets value from it. | 3.0 | 3.5 | 3.5 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.0 | 4.5 |
| Output qualityHow good the results are before you fix them. | 4.0 | 4.0 | 4.5 |
| Value for moneyWhat you get for the price, including the free plan. | 3.5 | 4.5 | 4.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 3.5 | 4.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Factory | Google Antigravity | OpenAI Codex |
|---|---|---|---|
| Access & platform | |||
| Free plan | No | Yes | Yes |
| Mobile app | – | No | Yes |
| Desktop app | Yes | Yes | Yes |
| Browser extension | – | Yes | No |
| API access | Yes | Yes | Yes |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | Yes |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | – | Yes | Yes |
| Makes images | No | Yes | No |
| Makes video | No | No | No |
| Writes code | Yes | Yes | Yes |
| Runs agents or automations | Yes | Yes | Yes |
| Learns your brand or style | – | Yes | Yes |
| Works in many languages | – | Yes | Yes |
| Capabilities score | 8/ 17 | 14/ 17 | 14/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Factory | Google Antigravity | OpenAI Codex |
|---|---|---|---|
| Plans | Pro $20/mo A developer trying agents day to day. | IndividualOur pick Free Trying agent-based coding without paying. | Free Free A quick look at what it can do. |
PlusOur pick $100/mo Developers who lean on agents all day. | Google AI Pro $19.99/mo People who already have or want the Google AI Pro bundle. | Go $8/mo Occasional light tasks. | |
Max $200/mo Heavy individual users. | Google AI Ultra From $99.99/mo Developers who want Antigravity as a daily driver. | PlusOur pick $20/mo Anyone who already pays for ChatGPT. | |
Teams $60/mo per team plus $40/seat Small teams up to 10 people. | Business (via Google Cloud) From $30/seat/mo Companies already on Google Cloud. | Pro From $100/mo Developers who hit the Plus limits. | |
Business / Enterprise Custom Larger companies with security requirements. | Business $20/user/mo billed yearly, or $25 monthly Teams of 2 or more. | ||
Enterprise Custom Large organisations. | |||
| Which plan to pick | Try Pro for a month to see if the agents suit your codebase. If you want Droids working in the background while you do other things, you need Plus. | Start on the free Individual tier; it is the whole point. If you hit the weekly limits and you also use Gemini for other things, Google AI Pro at $19.99 is a sensible step. Ultra only makes sense for full-time developers. | If you already have ChatGPT Plus, you have Codex: just try it. If you are choosing between this and Claude Code with no existing subscription, Plus at $20 and Claude Pro at $20 cost the same, so pick whichever chat assistant you prefer. If you outgrow Plus, Pro starts at $100 and has no five-hour limit for now. The $200 tier gives new subscribers less usage than it used to, and Ultrafast mode is only on the $500 tier. |
Key features
| Attribute | Factory | Google Antigravity | OpenAI Codex |
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Pros and cons
| Attribute | Factory | Google Antigravity | OpenAI Codex |
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Who each one is for
| Attribute | Factory | Google Antigravity | OpenAI Codex |
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Questions people ask
Which is better, Factory, Google Antigravity or OpenAI Codex?
OpenAI Codex scores highest overall in our ratings (Factory 3.8/5, Google Antigravity 3.9/5 and OpenAI Codex 4.2/5). Factory is best for working through backlog tickets in the background and bug fixes and small features from Jira or Linear. Google Antigravity is best for Trying AI coding agents for free and running several agents at once. OpenAI Codex is best for background tasks in the cloud and starting a task from your phone.
Which is cheaper, Factory, Google Antigravity or OpenAI Codex?
Factory: There's no free plan. Paid plans start at $20/mo. Google Antigravity: There's a free plan, and paid plans start at $19.99/mo. OpenAI Codex: There's a free plan, and paid plans start at $8/mo.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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