Side-by-side comparison · Coding & Dev Tools
OpenAI Codex vs Vapi vs Zed
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: ChatGPT subscribers who want a coding agent without paying for a second subscription.
Pick it if: Developers and voice AI agencies building custom phone or in-app voice agents.
Pick it if: Developers who want a fast editor and already pay for Claude or another AI provider.
Overview
| Attribute | OpenAI Codex | Vapi | Zed |
|---|---|---|---|
| In one line | OpenAI's coding agent. Hand it a task and it works away while you do other things. | Developer platform for building voice AI agents that make and take phone calls. | A fast, free, open-source code editor that runs Claude Code and other AI agents inside it. |
| Pricing model | Freemium | Paid | Open source |
| Starting price | $8/mo | $0.05/min hosting | $10/mo |
| Free plan | Yes | No | Yes |
| Works with Claude Code | No | Yes | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | OpenAI Codex | Vapi | Zed |
|---|---|---|---|
| Overall rating | 4.2 | 3.6 | 4.3Winner |
| Ease of useHow quickly someone non-technical gets value from it. | 3.5 | 2.5 | 3.5 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.5 | 4.0 |
| Output qualityHow good the results are before you fix them. | 4.5 | 4.0 | 4.0 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 3.5 | 5.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 3.5 | 5.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | OpenAI Codex | Vapi | Zed |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | No | Yes |
| Mobile app | Yes | – | No |
| Desktop app | Yes | – | Yes |
| Browser extension | No | – | No |
| API access | Yes | Yes | – |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | No |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | Yes | No | Yes |
| AI abilities | |||
| Works with your files | Yes | – | Yes |
| Understands images | Yes | – | Yes |
| Makes images | No | No | No |
| Makes video | No | No | No |
| Writes code | Yes | No | 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 | 6/ 17 | 11/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | OpenAI Codex | Vapi | Zed |
|---|---|---|---|
| Plans | Free Free A quick look at what it can do. | Pay as you goOur pick $0.05/min hosting, plus provider costs Developers building and testing. | PersonalOur pick Free Almost everyone. |
Go $8/mo Occasional light tasks. | Core $29/mo plus usage Builders and early teams going live. | Pro $10/mo People who want Zed's hosted AI without managing keys. | |
PlusOur pick $20/mo Anyone who already pays for ChatGPT. | Pro 10% of hosting fee, $999/mo minimum Teams running voice agents in production at scale. | Business $30/seat/mo Teams that need spending and access controls. | |
Pro From $100/mo Developers who hit the Plus limits. | Premier Custom Large organisations. | ||
Business $20/user/mo billed yearly, or $25 monthly Teams of 2 or more. | |||
Enterprise Custom Large organisations. | |||
| Which plan to pick | 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. | Build on pay as you go, then add Core when you go live and want email support. HIPAA compliance is a separate $2,000-a-month add-on, so check that early if you work in healthcare. | Personal. If you have Claude Pro, run Claude Code inside Zed and you are done. Pro only makes sense if you want Zed's built-in assistant and edit predictions without setting up API keys. |
Key features
| Attribute | OpenAI Codex | Vapi | Zed |
|---|---|---|---|
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Pros and cons
| Attribute | OpenAI Codex | Vapi | Zed |
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Who each one is for
| Attribute | OpenAI Codex | Vapi | Zed |
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Questions people ask
Which is better, OpenAI Codex, Vapi or Zed?
Zed scores highest overall in our ratings (OpenAI Codex 4.2/5, Vapi 3.6/5 and Zed 4.3/5). OpenAI Codex is best for background tasks in the cloud and starting a task from your phone. Vapi is best for custom voice agents built by developers and agencies building AI receptionists for clients. Zed is best for Running Claude Code inside an editor and speed on big projects.
Which is cheaper, OpenAI Codex, Vapi or Zed?
OpenAI Codex: There's a free plan, and paid plans start at $8/mo. Vapi: There's no free plan. Paid plans start at $0.05/min hosting. Zed: There's a free plan, and paid plans start at $10/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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