kitio.aiOpenAI API vs Grok API
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. OpenAI API starts at See pricing page and Grok API starts at See pricing page. Check both pricing pages for current plans.
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
- Grok text and reasoning models
- Image and video generation
- Voice agent API
- Web and X search tools
- OpenAI-compatible SDKs
| Feature | OpenAI API | Grok API |
|---|---|---|
| Best for | Developer API for GPT, reasoning, image, audio and embedding models | Developer API for Grok text, image, video and voice models |
| Category | Models & APIs | Models & APIs |
| Pricing model | Paid | Paid |
| Starting price | See pricing page | See pricing page |
| Free plan | No | No |
| Made by | OpenAI | SpaceX Super Intelligence (formerly xAI) |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
OpenAI API starts at See pricing page and Grok API starts at See pricing page. Check both pricing pages for current plans.
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
Grok API
- Live X data access
- Compatible with common SDKs
- Fast models at low prices
- Company name changed twice in 2026
- Fewer enterprise certifications
- Safety controls are looser
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 Grok API if you want:
- Live X data access
- Compatible with common SDKs
- Fast models at low prices
Watch out: company name changed twice in 2026.
OpenAI API vs Grok API FAQ
What is the difference between OpenAI API and Grok API?
OpenAI API: Developer API for GPT, reasoning, image, audio and embedding models. Grok API: Developer API for Grok text, image, video and voice models. Both are models & apis tools.
Is OpenAI API or Grok API cheaper?
OpenAI API starts at See pricing page and Grok API starts at See pricing page. Check both pricing pages for current plans.
Do OpenAI API and Grok API have free plans?
OpenAI API: No. Grok API: No.
Who makes OpenAI API?
OpenAI API is made by OpenAI, based in United States.
Who makes Grok API?
Grok API is made by SpaceX Super Intelligence (formerly xAI), based in United States.
Which should I choose, OpenAI API or Grok API?
Choose OpenAI API if you value wide model range in one api and mature sdks and docs. Choose Grok API if you value live x data access and compatible with common sdks.