Definable SDK vs OpenAI Agents SDK — AI Agent Framework Comparison
OpenAI Agents SDK locks you into OpenAI models. Definable SDK gives you 50+ models across 8 providers, built-in RAG, MCP, guardrails, and a marketplace — with the same clean API.
| Feature | Definable AI | OpenAI Agents SDK |
|---|---|---|
| Model Support | 50+ models across 8 providers | OpenAI models only |
| Agent API | Class-based with middleware and lifecycle hooks | Function-based with handoffs |
| RAG / Knowledge | Full pipeline — readers, chunkers, embedders, vector DBs | File search tool (managed by OpenAI) |
| Memory | Multi-tier persistent with auto-recall | Thread-based conversation history |
| MCP Support | Native MCP client (stdio + SSE) | Not built-in |
| Guardrails | Input, output, and tool-call guardrails | Input and output guardrails |
| Handoffs | Agent teams with shared context | Agent handoffs (smooth transitions) |
| Interfaces | Discord, Telegram, Signal built-in | Not built-in |
| Deployment | One-click deploy + marketplace | Self-deploy (no managed platform) |
| Tracing | Built-in tracing and cost tracking | Built-in tracing |
| Vendor Lock-in | No lock-in — switch models freely | Locked to OpenAI ecosystem |
Why developers choose Definable SDK over OpenAI Agents SDK
- Not locked to OpenAI — use any of 50+ models across 8 providers.
- Full RAG pipeline built-in — not just managed file search.
- Native MCP support for external tool servers.
- Built-in messaging interfaces for Discord, Telegram, and Signal.
- Marketplace deployment — publish agents and earn from every use.
FAQ
What is the difference between Definable AI and OpenAI Agents SDK?
OpenAI Agents SDK locks you into OpenAI models. Definable SDK gives you 50+ models across 8 providers, built-in RAG, MCP, guardrails, and a marketplace — with the same clean API.
Is Definable AI better than OpenAI Agents SDK?
Why developers choose Definable SDK over OpenAI Agents SDK: Not locked to OpenAI — use any of 50+ models across 8 providers. Full RAG pipeline built-in — not just managed file search. Native MCP support for external tool servers. Built-in messaging interfaces for Discord, Telegram, and Signal. Marketplace deployment — publish agents and earn from every use.
Can I switch from OpenAI Agents SDK to Definable AI?
Yes. Definable AI offers a free Starter plan with 5,000 credits so you can try it risk-free. Many of the features that require paid add-ons with OpenAI Agents SDK are included in Definable AI's base plans.