The OpenAI Assistants API provides a managed agent infrastructure — persistent threads, built-in tools, and file handling — without building agent infrastructure from scratch.
Built-In Agent Tools
- Code Interpreter: Runs Python in a sandbox — data analysis, chart generation, file processing
- File Search: RAG over uploaded documents — no vector database needed
- Function calling: Connect to any external API you define
When to Use Assistants API
- You want managed infrastructure (OpenAI handles threads and state)
- You need Code Interpreter capabilities
- Simpler use cases that don't require complex agent graphs
vs LangGraph
Assistants API for simplicity and managed infra. LangGraph for complex multi-step, multi-agent workflows.
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