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.
This comparison is generated from the sourced ChatGPT Agent and Letta profiles. Open either profile to review its evidence and last-reviewed date.