kitio.aiOpenAI API vs Core ML
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Core ML is completely free, while OpenAI API is paid.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Responses API
- Agents SDK
- Realtime voice API
- Image and audio models
- Batch API
- Fine-tuning and evals
- On-device inference
- Neural Engine acceleration
- Xcode integration
- Model conversion via coremltools
- Works offline
| Feature | OpenAI API | Core ML |
|---|---|---|
| Best for | Developer API for GPT, reasoning, image, audio and embedding models | Apple framework for running machine learning models on device |
| Category | Models & APIs | Models & APIs |
| Pricing model | Paid | Free |
| Starting price | See pricing page | Free |
| Free plan | No | Yes, fully free |
| Made by | OpenAI | Apple |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Core ML is completely free, while OpenAI API is paid.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
GPT-6 Luna
$0.10 / $0.50 per 1M tokens
- Input / output
- Fast, low-cost model
- 1.05M context
GPT-6.1 Sol
$2 / $10 per 1M tokens
- Input / output
- Balanced model
- 1.05M context
GPT-6 Astra
$10 / $50 per 1M tokens
- Input / output
- Most capable model
- 1.05M context
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 API
- Wide model range in one API
- Mature SDKs and docs
- Built-in tools like web search
- Top models are costly at scale
- Rate limits depend on spend tier
- Model names change frequently
Core ML
- Data stays on the user's device
- Uses Apple's Neural Engine
- Free with Apple's developer tools
- Only for Apple platforms
- Models must be converted to Core ML format
- Large models limited by device memory
Which one should you choose?
Choose OpenAI API if you want:
- Wide model range in one API
- Mature SDKs and docs
- Built-in tools like web search
Watch out: top models are costly at scale.
Choose Core ML if you want:
- Data stays on the user's device
- Uses Apple's Neural Engine
- Free with Apple's developer tools
Watch out: only for apple platforms.
OpenAI API vs Core ML FAQ
What is the difference between OpenAI API and Core ML?
OpenAI API: Developer API for GPT, reasoning, image, audio and embedding models. Core ML: Apple framework for running machine learning models on device. Both are models & apis tools.
Is OpenAI API or Core ML cheaper?
Core ML is completely free, while OpenAI API is paid.
Do OpenAI API and Core ML have free plans?
OpenAI API: No. Core ML: Yes, fully free.
Who makes OpenAI API?
OpenAI API is made by OpenAI, based in United States.
Who makes Core ML?
Core ML is made by Apple, based in United States.
Which should I choose, OpenAI API or Core ML?
Choose OpenAI API if you value wide model range in one api and mature sdks and docs. Choose Core ML if you value data stays on the user's device and uses apple's neural engine.