Devin is a coding agent; Hermes Agent is a personal agent — different tools for different jobs. Here is what each is for, how they differ, and when to run each (or both). Vote for your favorite.
Pick a winner in each category — you can change your vote anytime.
DevinHermesChoose Devin if you are teams that want to delegate well-scoped engineering tickets end-to-end. Choose Hermes Agent if you are power users who want a long-running personal agent that learns and compounds.
In our editorial scoring, Hermes Agent leads in 3 of six categories (reliability, speed and value), while Devin leads in 2 (output quality and ease of use). On price, Devin runs $20/mo entry + usage (acus) and is proprietary; Hermes Agent runs free (mit) / models via standard compute and is open source.
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Weighing the cost of running it? Compare API plans for Hermes
Devin is Cognition's fully autonomous software engineer: give it a task in Slack, Linear, or the web IDE and it plans, writes code, runs tests, and opens a pull request in its own cloud sandbox — including several sessions in parallel. It shines on well-scoped, repetitive engineering work (migrations, test coverage, small features) and improved markedly through its 2.x releases, but it remains weaker on ambiguous, novel tasks, and ACU-based usage pricing means heavy use costs real money. Cognition also acquired Windsurf in 2025, folding its IDE technology into the same product family.
Hermes Agent is Nous Research's open-source autonomous agent, released in February 2026 under the MIT license. Its defining feature is a built-in learning loop: after completing complex tasks it writes its own reusable skills, improves them with use, and builds persistent cross-session memory of you and your projects. It runs self-hosted — from a $5 VPS to a GPU cluster — works with 200+ models, and is reachable from the CLI or 20+ messaging platforms including Telegram, Discord, Slack, and WhatsApp.
Hermes Agent runs on Standard Compute
