OpenAI Function Calling
by OpenAI · paid · Last verified 2026-03-17
OpenAI's native capability for models to generate structured function calls in API responses. Enables reliable tool use by having models output JSON arguments matching defined function schemas.
https://platform.openai.com/docs/guides/function-calling ↗B+
B+—Good
Adoption: A+Quality: AFreshness: A+Citations: AEngagement: F
Specifications
- License
- Proprietary
- Pricing
- paid
- Capabilities
- function-calling, structured-output, tool-use, parallel-calls, strict-mode
- Integrations
- langchain, llamaindex, litellm
- Use Cases
- tool-use, api-integration, data-extraction, agent-actions
- API Available
- Yes
- SDK Languages
- python, typescript
- Deployment
- cloud
- Rate Limits
- Part of OpenAI API rate limits
- Data Privacy
- OpenAI API data processing terms apply
- Tags
- function-calling, openai, tool-use, structured-output
- Added
- 2026-03-17
- Completeness
- 100%
Index Score
74.8Adoption
90
Quality
88
Freshness
90
Citations
85
Engagement
0