kitio.aiNot Diamond vs Carton
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Carton is completely free, while Not Diamond is paid.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Per-request model routing
- Multi-provider support
- Savings dashboard
- Continuous learning
- Enterprise SSO
- Framework-agnostic inference API
- Model packing without conversion
- Automatic runner selection
- Rust core with language bindings
- Community model registry
| Feature | Not Diamond | Carton |
|---|---|---|
| Best for | Model router that picks the cheapest capable model for coding agents | Open-source library to run ML models from many programming languages |
| Category | Models & APIs | Models & APIs |
| Pricing model | Paid | Free |
| Starting price | See pricing page | Free |
| Free plan | No | Yes, fully free |
| Made by | Not Diamond | Carton |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Carton is completely free, while Not Diamond is paid.
Free plan
Cheapest paid plan
Top plan
Free trial
2 plans
Pay-as-you-go
$0.05 / 1M tokens
- Multi-provider support
- Savings and usage dashboard
- Apply for access
Enterprise
Contact sales
- SAML SSO
- Advanced security and admin
- Privacy-preserving deployment
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Not Diamond
- Cuts spend on frontier models
- Works across providers
- Usage-based fee
- Savings figures are the vendor's own claims
- Access is by application
- Focused on coding agents
Carton
- Free and open source
- No error-prone model conversion
- Same API across frameworks
- Many language bindings still in progress
- Small community compared to ONNX tooling
- Developer-only, no hosted service
Which one should you choose?
Choose Not Diamond if you want:
- Cuts spend on frontier models
- Works across providers
- Usage-based fee
Watch out: savings figures are the vendor's own claims.
Choose Carton if you want:
- Free and open source
- No error-prone model conversion
- Same API across frameworks
Watch out: many language bindings still in progress.
Not Diamond vs Carton FAQ
What is the difference between Not Diamond and Carton?
Not Diamond: Model router that picks the cheapest capable model for coding agents. Carton: Open-source library to run ML models from many programming languages. Both are models & apis tools.
Is Not Diamond or Carton cheaper?
Carton is completely free, while Not Diamond is paid.
Do Not Diamond and Carton have free plans?
Not Diamond: No. Carton: Yes, fully free.
Who makes Not Diamond?
Not Diamond is made by Not Diamond.
Who makes Carton?
Carton is made by Carton.
Which should I choose, Not Diamond or Carton?
Choose Not Diamond if you value cuts spend on frontier models and works across providers. Choose Carton if you value free and open source and no error-prone model conversion.