ChatGPT vs Letta
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose ChatGPT if you want openai's ai assistant: chat, voice, image, search, deep research, and agent mode (Assistant, freemium); choose Letta if you want open-source framework for stateful ai agents with long-term memory (Supervised agent, freemium).
| ChatGPT | Letta | |
|---|---|---|
| What it is | OpenAI's AI assistant: chat, voice, image, search, deep research, and agent mode | Open-source framework for stateful AI agents with long-term memory |
| Type | product-with-agents | framework |
| Autonomy | Assistant | Supervised agent |
| Pricing | freemium · Free; Plus reported at $20/mo | freemium · Free (open source); Cloud Pro $20/mo + usage |
| Best for | consumers, smb, enterprise, developers | developers |
| Deployment | saas, api | self-hosted, saas, api |
| Modalities | text, voice, image, code, browser, api | text, code, api |
| Models | gpt, proprietary | model-agnostic, gpt, claude, open-source |
| Protocols | mcp, function-calling, rest-api | mcp, rest-api |
| Integrations | Google Drive, GitHub, Gmail, Microsoft 365, Slack, MCP connectors | MCP servers, OpenAI, Anthropic, Ollama, custom tools |
| Capabilities | 6 documented | 4 documented |
ChatGPT
- +Broadest, most capable consumer AI assistant: chat, voice, image, search, files, and code in one place
- +Generous free tier plus a clear ladder of paid plans (Go, Plus, Pro, Business, Enterprise)
- +Agentic surfaces (deep research, agent mode) layered on top for users who need multi-step work
- -Mostly an assistant: the base product responds when asked rather than acting autonomously
- -Best agentic and reasoning features are gated to higher-priced paid tiers
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 is openai's ai assistant: chat, voice, image, search, deep research, and agent mode, best for consumers, smb, enterprise, developers. 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.