kitio.aiGrok API vs AI21
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Grok API starts at See pricing page and AI21 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
- Grok text and reasoning models
- Image and video generation
- Voice agent API
- Web and X search tools
- OpenAI-compatible SDKs
- Jamba Mini and Jamba Large APIs
- Long-context models
- Custom post-training
- Python SDK
- Free trial credits
| Feature | Grok API | AI21 |
|---|---|---|
| Best for | Developer API for Grok text, image, video and voice models | Jamba model APIs and custom post-training for enterprises |
| Category | Models & APIs | Models & APIs |
| Pricing model | Paid | Free trial |
| Starting price | See pricing page | See pricing page |
| Free plan | No | No, 7-day trial |
| Made by | SpaceX Super Intelligence (formerly xAI) | AI21 Labs |
| Based in | United States | Israel |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Grok API starts at See pricing page and AI21 starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Jamba Mini
$0.2 / 1M input tokens
- $0.4 per 1M output tokens
- Lightweight general model
Jamba Large
$2 / 1M input tokens
- $8 per 1M output tokens
- Long-context model
Custom
Contact sales
- Volume discounts
- Dedicated account manager
- Priority support
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
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
AI21
- Low per-token price on Jamba Mini
- Long context windows
- Customer owns its post-trained model
- Trial credits expire after 7 days
- Smaller ecosystem than larger model labs
- Post-training requires a sales process
Which one should you choose?
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.
Choose AI21 if you want:
- Low per-token price on Jamba Mini
- Long context windows
- Customer owns its post-trained model
Watch out: trial credits expire after 7 days.
Grok API vs AI21 FAQ
What is the difference between Grok API and AI21?
Grok API: Developer API for Grok text, image, video and voice models. AI21: Jamba model APIs and custom post-training for enterprises. Both are models & apis tools.
Is Grok API or AI21 cheaper?
Grok API starts at See pricing page and AI21 starts at See pricing page. Check both pricing pages for current plans.
Do Grok API and AI21 have free plans?
Grok API: No. AI21: No, 7-day trial.
Who makes Grok API?
Grok API is made by SpaceX Super Intelligence (formerly xAI), based in United States.
Who makes AI21?
AI21 is made by AI21 Labs, based in Israel.
Which should I choose, Grok API or AI21?
Choose Grok API if you value live x data access and compatible with common sdks. Choose AI21 if you value low per-token price on jamba mini and long context windows.