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