Side-by-side comparison · Coding & Dev Tools
Google Antigravity vs OpenAI Codex vs OpenCode
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: 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.
Pick it if: Developers and tinkerers who want a capable coding agent without a big subscription, or who want to choose their own models.
OpenAI Codex scores highest overall, but OpenCode gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
|---|---|---|---|
| In one line | 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. | A free, open-source coding agent that works with almost any AI model, including free ones. |
| Pricing model | Freemium | Freemium | Open source |
| Starting price | $19.99/mo | $8/mo | Pay as you go |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | No | No | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
|---|---|---|---|
| Overall rating | 3.9 | 4.2Winner | 3.8 |
| Ease of useHow quickly someone non-technical gets value from it. | 3.5 | 3.5 | 3.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.0 | 4.5 | 4.5 |
| Output qualityHow good the results are before you fix them. | 4.0 | 4.5 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 4.5 | 5.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 3.5 | 4.0 | 3.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | No | Yes | No |
| Desktop app | Yes | Yes | Yes |
| Browser extension | Yes | No | No |
| API access | Yes | Yes | Yes |
| Teams & business | |||
| Team workspace | Yes | Yes | No |
| Enterprise plan or SSO | Yes | Yes | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | Yes | Yes |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | Yes | Yes | Yes |
| Makes images | Yes | No | 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 | Yes |
| Capabilities score | 14/ 17 | 14/ 17 | 11/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
|---|---|---|---|
| Plans | IndividualOur pick Free Trying agent-based coding without paying. | Free Free A quick look at what it can do. | OpenCode Free Anyone with their own model access, or happy with the free models. |
Google AI Pro $19.99/mo People who already have or want the Google AI Pro bundle. | Go $8/mo Occasional light tasks. | Zen Pay as you go, from a $20 top-up People who want top models without a subscription. | |
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. | GoOur pick $10/mo Most people who want to code daily on a budget. | |
Business (via Google Cloud) From $30/seat/mo Companies already on Google Cloud. | Pro From $100/mo Developers who hit the Plus limits. | Go Plus $40/mo Heavy users who hit the Go limits. | |
Business $20/user/mo billed yearly, or $25 monthly Teams of 2 or more. | Enterprise Custom Companies rolling it out to a team. | ||
Enterprise Custom Large organisations. | |||
| Which plan to pick | 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. | Start free. If the free models feel thin, OpenCode Go at $10 a month is the best-value upgrade in this category. Only add Zen or a Claude or OpenAI API key when you need a frontier model for a hard job, and set a spending cap when you do. |
Key features
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
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Pros and cons
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
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Who each one is for
| Attribute | Google Antigravity | OpenAI Codex | OpenCode |
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Questions people ask
Which is better, Google Antigravity, OpenAI Codex or OpenCode?
OpenAI Codex scores highest overall in our ratings (Google Antigravity 3.9/5, OpenAI Codex 4.2/5 and OpenCode 3.8/5). 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. OpenCode is best for coding with free or low-cost models and using any AI provider, including local models.
Which is cheaper, Google Antigravity, OpenAI Codex or OpenCode?
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. OpenCode: There's a free plan, and paid plans start at Pay as you go.
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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