Side-by-side comparison · Coding & Dev Tools
GitHub Copilot vs OpenAI Codex vs Vapi
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: Teams and developers whose code lives on GitHub and who want AI in the tools they already use.
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 | GitHub Copilot | OpenAI Codex | Vapi |
|---|---|---|---|
| In one line | GitHub's AI helper: it finishes your code, reviews pull requests and takes on whole tasks. | 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. |
| Pricing model | Freemium | Freemium | Paid |
| Starting price | $10/mo | $8/mo | $0.05/min hosting |
| Free plan | Yes | Yes | No |
| Works with Claude Code | No | No | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
|---|---|---|---|
| Overall rating | 4.0 | 4.2Winner | 3.6 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.0 | 3.5 | 2.5 |
| 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. | 3.5 | 4.5 | 4.0 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 4.5 | 3.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 4.0 | 3.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | No |
| Mobile app | Yes | Yes | – |
| Desktop app | Yes | Yes | – |
| Browser extension | – | 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 | No | Yes | No |
| 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 | Yes | No |
| Runs agents or automations | Yes | Yes | Yes |
| Learns your brand or style | Yes | Yes | – |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 12/ 17 | 14/ 17 | 6/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
|---|---|---|---|
| Plans | Free Free Trying autocomplete and light chat. | 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. |
ProOur pick $10/mo Individual developers on GitHub. | Go $8/mo Occasional light tasks. | Core $29/mo plus usage Builders and early teams going live. | |
Pro+ $39/mo Developers who run agent tasks every day. | 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 $100/mo Heavy agent-driven work. | Pro From $100/mo Developers who hit the Plus limits. | Premier Custom Large organisations. | |
Business and Enterprise See website Companies that need admin controls and policy management. | Business $20/user/mo billed yearly, or $25 monthly Teams of 2 or more. | ||
Enterprise Custom Large organisations. | |||
| Which plan to pick | Pro is the sweet spot for an individual: cheap, unlimited autocomplete and enough credits for a few agent tasks a week. Only move to Pro+ if you find yourself buying extra credits every month. | 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. |
Key features
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
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Pros and cons
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
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Who each one is for
| Attribute | GitHub Copilot | OpenAI Codex | Vapi |
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Questions people ask
Which is better, GitHub Copilot, OpenAI Codex or Vapi?
OpenAI Codex scores highest overall in our ratings (GitHub Copilot 4.0/5, OpenAI Codex 4.2/5 and Vapi 3.6/5). GitHub Copilot is best for autocomplete as you type and Handing GitHub issues to an agent. 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.
Which is cheaper, GitHub Copilot, OpenAI Codex or Vapi?
GitHub Copilot: There's a free plan, and paid plans start at $10/mo. 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.
Which is easier to use, GitHub Copilot, OpenAI Codex or Vapi?
GitHub Copilot rates highest for ease of use in our scores. Teams and developers whose code lives on GitHub and who want AI in the tools they already use.
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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