OpenAI GPT (API)
OpenAI
The model layer behind ChatGPT, for developers building custom assistants, agents, and AI features.
ModelPay as you goAdvancedBusiness privacy controlsArabic: GoodAPI
Best for
- Developers building AI features
- Custom assistants and agents
- Programmatic text, code, and vision
Not ideal for
- Non-technical end users (use ChatGPT instead)
- One-off tasks without any setup
Strengths
- Strong general-purpose models
- Rich API with tools, vision, and audio
- API data not used for training by default
Limitations
- Requires development work
- Usage-based costs to manage
Getting good results
- Use a system prompt to set behavior
- Constrain outputs with a JSON schema
- Add retrieval for grounded answers
Prompt template
Starter prompt for OpenAI GPT (API)
System: You are [role]. Rules: [constraints]. User: [task]. Return [strict format].
Alternatives to consider
Anthropic Claude (API)
The model layer behind Claude, suited to long-context, document-heavy, and analysis-heavy applications.
Gemini
Google's multimodal assistant, strong for research with search grounding and for users in the Google ecosystem.
Mistral
Efficient open-weight and API models with good multilingual performance and private-deployment options.