Hermes Agent is a personal agent; Pi is a terminal coding 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.
Looking for the Oh My Pi (omp) fork instead?See Oh My Pi vs Hermes Agent →
Either way, you pay for the model calls. A median coding-agent day on our gateway is 95 requests and 8.6 million tokens. The table prices every step at one model’s rate.
Both run on Standard Compute, where each step goes to the cheapest model that can do it: routine steps go to efficient open models, hard ones to frontier models such as Claude Fable 5.1 or GPT-6 Astra.
| Model | Typical day | Busy day |
|---|---|---|
| Claude Opus 5.5 | $7.34 | $59.10 |
| Claude Sonnet 5.5 | $3.67 | $29.55 |
| GPT-6 Luna | $0.23 | $2.43 |
Fixed monthly plans from $19. Eligible new accounts can try $0.25 of compute first, no card. Trial terms
Pick a winner in each category. You can change your vote anytime. 304 votes cast so far.
Another cross-category matchup that search loves: Hermes Agent is Nous Research's always-on personal agent: persistent memory, a learning loop that writes reusable skills, self-hosted from a $5 VPS, reachable from 20+ messaging platforms. Pi (pi.dev) is Mario Zechner's radically minimal terminal coding agent: read/write/edit/bash at the core, TypeScript extensions for everything else, and one of the fastest loops in the category.
One runs your digital life continuously; the other is a precision instrument you pick up to write code. Hermes' autonomy score (9.5) reflects true long-horizon independence; Pi's speed and cost scores reflect a tool honed for interactive sessions.
Both are MIT-licensed, bring-your-own-model, and happily share an OpenAI-compatible endpoint, which is why 'run both' is the genuinely common answer among power users.
HermesPiChoose Hermes Agent if you are power users who want a long-running personal agent that learns and compounds. Choose Pi if you are developers who want a fast, minimal, hackable terminal agent with full control over context and models.
In our editorial scoring, Hermes Agent leads in 3 of six categories (autonomy, reliability and ease of use), while Pi leads in 2 (speed and value). On price, Hermes Agent runs free (mit) / models via standard compute and is open source; Pi runs free (mit), bring your own model and is open source.
Across 304 community votes on this matchup, Hermes Agent currently leads in 4 of six categories. Cast your own vote above to move the needle.
What it costs to run Hermes or Pi
Best API for Hermes →
6 options compared, with prices and limits
Best API for Pi →
4 options compared, with prices and limits
Standard Compute sends each step to the cheapest model that can do it, on providers we vet for price, uptime and speed. Plans start at $19 a month, and eligible new accounts can try $0.25 of compute with no card. Choose your agent below to connect.
See the trial and activation steps →
More on Hermes: How Much Does Hermes Agent Cost to Run? · How do I use Gemini in Hermes Agent?
More on Pi: What Does the Pi Coding Agent Cost to Run, and How Do You Make It Predictable? · How do I use DeepSeek in the Pi coding agent?
Real reasoning from 5 recent community votes on this matchup. Add yours by voting above.
Picked Hermesfor Ease of Use3mo ago“both are hard to master, I guess 1st timers prefer Pi, but over time it gets harder to maintain, since everything is a plugin. Hermes usually manages itself”
Picked Pifor Value3mo ago“less token consumption, but hermes has better management”
Picked Hermesfor Reliability3mo ago“simply waterproof”
Picked Hermesfor Autonomy3mo ago“memmories...”
Picked Hermesfor Output Quality3mo ago“Hermes usually knows what I actually want, thanks to the memories.”
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.
Pi is an open-source terminal coding agent and agent harness created by Mario Zechner (badlogic, creator of libGDX) and published under MIT by Earendil. Its philosophy is radical minimalism: by default the model gets a small set of tools (read, write, edit, bash), and everything else, from subagents to plan mode, lives in TypeScript extensions. That keeps the loop fast, the context clean, and the behavior fully under your control. It supports 30+ model providers with mid-session switching, session branching and compaction for long tasks, and custom OpenAI-compatible providers via a simple models.json.
Hermes and Pi both run on Standard Compute
