Tools
Hermes Agent vs Letta
Hermes Agent or Letta? Their plans monthly and yearly, the capabilities their makers state, security and latest updates, side by side — read from the makers' own pages.
In short
- Both: Command line, Choice of models, Self-hosted
- Only Hermes Agent states: API
- Only Letta states: Agent that edits files, Official SDKs, Builds agents and workflows
Hermes Agent
Open-source AI agent for chat, research, coding, automation, web tools, memory, and messaging platforms.
Plans
Free
Free
- Core Hermes Agent (open-source, local)
- Bring your own keys / local models (Ollama etc.)
Plus
- $20 Per month*
- 200+ hosted models
- Hosted tool usage
- High rate limits
- $22.00 monthly credits — 10% bonus
- $10.00 rollover cap
Super
- $100 Per month*
- 200+ hosted models
- Hosted tool usage
- High rate limits
- $110.00 monthly credits — 10% bonus
- $50.00 rollover cap
Ultra
- $200 Per month*
- 200+ hosted models
- Hosted tool usage
- High rate limits
- $220.00 monthly credits — 10% bonus
- $100.00 rollover cap
Prices checked 2026-09-25 by web search.
Capabilities
- Command line — “Install via terminal” source
- Choice of models — “You can switch models with one command.” source
- Self-hosted — “An autonomous agent that lives on your server, remembers what it learns, and gets more capable the longer it runs.” source
- API — “Hermes Agent API Docs” source
Latest updates
- Hermes Agent v0.21.5 (v2026.9.24) (v0.21.5)
Released v0.21.5 as a stable tagged release for downstream consumers.
- Hermes Agent v0.21.4 (v2026.9.21) (v0.21.4)
Added a host-wide gateway singleton lock and had Desktop attach to the running host backend.
- Hermes Agent v0.21.3 (v2026.9.14) (v0.21.3)
Remote dashboard sessions no longer expire during refresh bursts.
Letta
Letta builds stateful AI agents with persistent memory, tools, skills, and the ability to learn from ongoing work.
Plans
Free
Free
- Limited agents
- Limited usage of Letta Auto
- Bring your own API keys and external coding plans
Pro
- $20 /month
- Letta Auto weekly + monthly quota
- Pay-as-you-go overage
- Up to 20 stateful agents
API Plan
- $20 /month
- Unlimited agents
- API key authentication
- Pay-as-you-go LLM usage
Teams Pro
- $20 /seat/month
- Add teammates to your organization
- Letta Auto weekly + monthly quota
- Share agents and set access control
Enterprise
Price on request
- Volume-based pricing
- Increased quotas
- Role-based access control
- SAML/OIDC SSO
- Dedicated support
Prices checked 2026-09-25 on the maker’s page.
Capabilities
- Agent that edits files — “Dynamic workflows invokes agents programmatically to compare plans across models, cross-check research, and migrate files in isolated Cloud sandboxes.” source
- Command line — “Install in your terminal (requires Node.js 18+):” source
- Choice of models — “Model-agnostic, managed agents” source
- Self-hosted — “The same SDK interface to interact with stateful agents works against Letta Cloud, a self-hosted App Server, or entirely on your machine:” source
- Official SDKs — “Today, we are launching the Letta Agents SDK, a TypeScript library for building with stateful agents.” source
- Builds agents and workflows — “You can use the Agents SDK to create multi-agent and multi-user applications, for dynamic orchestration of agents, or to build custom interfaces on top of Letta agents.” source
Latest updates
- Release v0.33.1 (v0.33.1)
Added Claude Code and Codex workers for subagents.
- Release v0.33.0 (v0.33.0)
Added a background worker to repair post-turn Git conflicts.
- Release v0.32.19 (v0.32.19)
Added live workflow status rows below the CLI input.