ChatGPT Agent vs Letta
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose ChatGPT Agent if you want openai's agentic mode in chatgpt that browses, runs code, and acts (Supervised agent, subscription); choose Letta if you want open-source framework for stateful ai agents with long-term memory (Supervised agent, freemium).
| ChatGPT Agent | Letta | |
|---|---|---|
| What it is | OpenAI's agentic mode in ChatGPT that browses, runs code, and acts | Open-source framework for stateful AI agents with long-term memory |
| Type | product-with-agents | framework |
| Autonomy | Supervised agent | Supervised agent |
| Pricing | subscription · Included in ChatGPT Plus/Pro/Team/Enterprise plans | freemium · Free (open source); Cloud Pro $20/mo + usage |
| Best for | consumers, smb, enterprise | developers |
| Deployment | saas | self-hosted, saas, api |
| Modalities | text, browser, code | text, code, api |
| Models | gpt, proprietary | model-agnostic, gpt, claude, open-source |
| Protocols | function-calling, rest-api | mcp, rest-api |
| Integrations | Gmail, GitHub, ChatGPT connectors | MCP servers, OpenAI, Anthropic, Ollama, custom tools |
| Capabilities | 4 documented | 4 documented |
ChatGPT Agent
- +Unifies browsing (Operator) and analysis (Deep Research) into one agent
- +Acts on a virtual computer: browses, runs code, and builds deliverables
- +Available across ChatGPT paid plans with no separate product to adopt
- -Agentic browsing can be slow and error-prone on complex sites and login/CAPTCHA flows
- -Requires user oversight; not a hands-off autonomous worker
Letta
- +Genuinely differentiated memory architecture (self-editing memory blocks from MemGPT research, not a RAG wrapper)
- +Open source under Apache-2.0, self-hostable, and model-agnostic, which avoids lock-in
- +Strong developer ergonomics: REST API, Python and TypeScript SDKs, and the ADE GUI with deep state visibility
- -Positioning has become muddy across research lab, stateful-agents platform, and a Letta Code coding agent
- -Real usage costs climb well beyond the $20 Pro tier once LLM token pass-through is counted
Which should you choose?
ChatGPT Agent is openai's agentic mode in chatgpt that browses, runs code, and acts, best for consumers, smb, enterprise. Letta is open-source framework for stateful ai agents with long-term memory, best for developers. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.