kitio.aiOpenAI Codex vs Aider
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Aider is completely free, while OpenAI Codex is freemium.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Cloud coding tasks
- Codex CLI
- IDE extension
- Desktop app
- Automatic PR review
- Repository map
- Automatic git commits
- Architect mode
- Voice coding
- Any LLM provider
| Feature | OpenAI Codex | Aider |
|---|---|---|
| Best for | OpenAI's coding agent in the cloud, CLI, IDE and desktop app | Open-source AI pair programming in your terminal |
| Category | Coding | Coding |
| Pricing model | Freemium | Free |
| Starting price | $8/mo | Free |
| Free plan | Yes | Yes, fully free |
| Made by | OpenAI | Paul Gauthier |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Aider is completely free, while OpenAI Codex is freemium.
Free plan
Cheapest paid plan
Top plan
Free trial
6 plans
Free
Free
- Limited Codex usage
- Via ChatGPT account
Go
$8/mo
- ChatGPT Go plan
- More Codex usage than Free
Plus
$20/mo
- ChatGPT Plus plan
- Codex in CLI, IDE and cloud
Pro
$100/mo
- Starting price; $200 and $500 tiers
- Highest Codex limits
Business
$25/mo
- Per user
- Shared workspace and admin controls
Enterprise
Contact sales
- Enterprise security
- Flexible usage
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
OpenAI Codex
- Included in ChatGPT plans
- Runs many tasks in parallel
- Open-source CLI
- Token-based limits are hard to predict
- Free tier usage is small
Aider
- Completely free and open source
- Clean git history of AI edits
- Works with almost any model
- Few new features since 2025
- Terminal-only workflow
Which one should you choose?
Choose OpenAI Codex if you want:
- Included in ChatGPT plans
- Runs many tasks in parallel
- Open-source CLI
Watch out: token-based limits are hard to predict.
Choose Aider if you want:
- Completely free and open source
- Clean git history of AI edits
- Works with almost any model
Watch out: few new features since 2025.
OpenAI Codex vs Aider FAQ
What is the difference between OpenAI Codex and Aider?
OpenAI Codex: OpenAI's coding agent in the cloud, CLI, IDE and desktop app. Aider: Open-source AI pair programming in your terminal. Both are coding tools.
Is OpenAI Codex or Aider cheaper?
Aider is completely free, while OpenAI Codex is freemium.
Do OpenAI Codex and Aider have free plans?
OpenAI Codex: Yes. Aider: Yes, fully free.
Who makes OpenAI Codex?
OpenAI Codex is made by OpenAI, based in United States.
Who makes Aider?
Aider is made by Paul Gauthier, based in United States.
Which should I choose, OpenAI Codex or Aider?
Choose OpenAI Codex if you value included in chatgpt plans and runs many tasks in parallel. Choose Aider if you value completely free and open source and clean git history of ai edits.