kitio.aiOpenAI API vs PromptGround
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 PromptGround 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
- Prompt version tracking
- Live prompt editor
- One API key for many models
- Python and JavaScript SDKs
- Run logs and spend tracking
- Prompt variables
| Feature | OpenAI API | PromptGround |
|---|---|---|
| Best for | Developer API for GPT, reasoning, image, audio and embedding models | Prompt versioning, testing and one API key for many models |
| Category | Models & APIs | Models & APIs |
| Pricing model | Paid | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | No | Yes |
| Made by | OpenAI | PromptGround |
| Based in | 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 PromptGround 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
PromptGround
- One key covers several model providers
- Free team members and unlimited projects
- Per-run logs show token use and cost
- Paid plan prices are not shown on the homepage
- Only Python and JavaScript SDKs are listed
- Free tier is a one-time token allowance
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 PromptGround if you want:
- One key covers several model providers
- Free team members and unlimited projects
- Per-run logs show token use and cost
Watch out: paid plan prices are not shown on the homepage.
OpenAI API vs PromptGround FAQ
What is the difference between OpenAI API and PromptGround?
OpenAI API: Developer API for GPT, reasoning, image, audio and embedding models. PromptGround: Prompt versioning, testing and one API key for many models. Both are models & apis tools.
Is OpenAI API or PromptGround cheaper?
OpenAI API starts at See pricing page and PromptGround starts at See pricing page. Check both pricing pages for current plans.
Do OpenAI API and PromptGround have free plans?
OpenAI API: No. PromptGround: Yes.
Who makes OpenAI API?
OpenAI API is made by OpenAI, based in United States.
Who makes PromptGround?
PromptGround is made by PromptGround.
Which should I choose, OpenAI API or PromptGround?
Choose OpenAI API if you value wide model range in one api and mature sdks and docs. Choose PromptGround if you value one key covers several model providers and free team members and unlimited projects.