Side-by-side comparison · Coding & Dev Tools
OpenAI Codex vs Vapi vs Warp
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.
Overview
| Attribute | OpenAI Codex | Vapi | Warp |
|---|---|---|---|
| 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 modern terminal where you can type what you want in plain English instead of commands. |
| Pricing model | Freemium | Paid | Freemium |
| Starting price | $8/mo | $0.05/min hosting | $20/mo |
| Free plan | Yes | No | Yes |
| Works with Claude Code | No | Yes | No |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | OpenAI Codex | Vapi | Warp |
|---|---|---|---|
| Overall rating | 4.2Winner | 3.6 | 4.1 |
| Ease of useHow quickly someone non-technical gets value from it. | 3.5 | 2.5 | 4.5 |
| 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 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 3.5 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 3.5 | 4.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | OpenAI Codex | Vapi | Warp |
|---|---|---|---|
| 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 | Yes |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | Yes | No | No |
| AI abilities | |||
| Works with your files | Yes | – | Yes |
| Understands images | 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 | 10/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | OpenAI Codex | Vapi | Warp |
|---|---|---|---|
| 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. | FreeOur pick Free Everyone who just wants a better terminal. |
Go $8/mo Occasional light tasks. | Core $29/mo plus usage Builders and early teams going live. | Build $20/mo, or $18/mo billed yearly People who lean on the Warp agent daily. | |
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. | Max $200/mo, or $180/mo billed yearly Heavy agent users. | |
Pro From $100/mo Developers who hit the Plus limits. | Premier Custom Large organisations. | Business $50/user/mo, or $45/user/mo billed yearly Teams that need SSO and usage metrics. | |
Business $20/user/mo billed yearly, or $25 monthly Teams of 2 or more. | Enterprise Custom Large organisations. | ||
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. | Stay on Free. The terminal is the product, and you can run Claude Code inside it on your Claude subscription without paying Warp anything. Only buy Build if you find yourself using Warp's own agent more than Claude Code. |
Key features
| Attribute | OpenAI Codex | Vapi | Warp |
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Pros and cons
| Attribute | OpenAI Codex | Vapi | Warp |
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Who each one is for
| Attribute | OpenAI Codex | Vapi | Warp |
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Questions people ask
Which is better, OpenAI Codex, Vapi or Warp?
OpenAI Codex scores highest overall in our ratings (OpenAI Codex 4.2/5, Vapi 3.6/5 and Warp 4.1/5). 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. Warp is best for A nicer home for Claude Code and Plain-English commands.
Which is cheaper, OpenAI Codex, Vapi or Warp?
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. Warp: There's a free plan, and paid plans start at $20/mo.
Which is easier to use, OpenAI Codex, Vapi or Warp?
Warp rates highest for ease of use in our scores. Anyone who has to use the terminal but never wanted to learn it.
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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