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Hermes / OpenClaw Agent Cost Calculator
Estimate the real monthly cost of running AI agents. Pick a model or plan, a usage level, and a number of agents to compare per-token API billing, flat subscriptions, and self-hosted models on a VPS — and find the cheapest way to run agents 24/7.
Configure your agents
Steady automation through the workday (~19M tokens/mo per agent)
Estimated monthly cost
Claude Opus 4.8 (API) · 3 agents · medium workload. Per-token billing scales with every token in and out.
Same workload, three ways
The gap is the whole point: per-token API bills scale without limit, subscriptions are flat but interactive-only, and a self-hosted model on a VPS is close to free to run.
Per-token API
Claude Opus 4.8, always billed by usage
Flat subscription
Claude Max 20x / ChatGPT Pro, per person
Local model + VPS
Open model on Hostinger KVM4
Cheapest
Cheapest way to run agents 24/7
For interactive, single-person work a flat subscription ($20–$200) is usually simplest. But the moment you want agents running unattended 24/7, per-token API bills climb fast and the cheapest durable option is a self-hosted model on a VPS you control — from $8.79/mo for API-mode agents, or Hostinger KVM4 (~$14/mo) to host a local model.
Run OpenClaw on a Hostinger VPS — from $8.79/mo, up to 70% offAffiliate link. One-click OpenClaw install; you keep full control of the server and your keys. Not sure which plan? Use the VPS plan picker.
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Get this cost breakdown plus the weekly agent tooling digest — model prices, cheap-hosting tips, and new OpenClaw skills.
Keep going
- Hermes agent cost breakdown — real monthly numbers for API vs subscription vs self-hosted.
- Run a Hermes agent on a Hostinger VPS — the always-on setup this calculator points at.
- Claude API cost calculator — go deeper on token counts and prompt caching.
- MCP server directory — tools to plug into whichever model you land on.
How this agent cost calculator works
There are three completely different ways to pay for the model behind an agent, and they scale in opposite directions. Per-token API pricing (Claude, GPT, OpenRouter) bills every token in and out, so cost grows with usage and never hits a ceiling. A flat subscription (ChatGPT Plus or Pro, Claude Pro or Max) is a fixed $20 to $200 a month, but it covers one person's interactive use and does not cover programmatic API traffic. A self-hosted open model on a VPS makes the tokens free and charges you only for the server.
The calculator multiplies a monthly token estimate for your chosen usage level by the number of agents and the model's per-token rate. As of July 2026 that is $5 input / $25 output per million tokens for Claude Opus 4.8, $3 / $15 for Claude Sonnet 5 (introductory $2 / $10 through August 31, 2026), $1 / $5 for Claude Haiku 4.5, $5 / $30 for GPT-5.5, and $0.63 / $5 for GPT-5.1. Our Claude API cost calculator goes deeper on token counts and prompt caching.
The gap is the point. An always-on agent on Opus 4.8 can cost thousands of dollars a month in raw tokens, while a subscription is flat and a self-hosted model on a Hostinger VPS runs from about $9 a month. That is why the recommendation funnels heavy, unattended workloads toward self-hosting. See the Hermes agent cost breakdown for worked real-world numbers.
Frequently asked questions
Why is always-on Opus so expensive?
An agent that loops continuously resends its context on every step, so a single always-on agent can push hundreds of millions of tokens a month. At $5 input and $25 output per million, that is thousands of dollars per agent before you add a second one. Prompt caching helps, but the trend line still climbs with usage.
Can I just use my ChatGPT or Claude subscription?
For your own interactive chatting and coding, yes. But subscriptions do not include API tokens, and API keys do not include a subscription. Programmatic agents that run unattended have to use the API or a self-hosted model, so a flat $20 to $200 plan cannot power a fleet running around the clock.
What is the cheapest way to run agents 24/7?
A self-hosted open model on a VPS you control. The model tokens are free, so you pay only for the server — from $8.79 a month for API-mode agents, or a KVM 4 class box (around $14 a month) to host a local model. Not sure which plan? Use the VPS plan picker.
Are these prices accurate?
They match each provider's published per-token and subscription pricing as of July 2026. Real bills vary with actual token counts, caching, batch discounts, and promotions, so treat the output as a planning estimate and confirm current rates before committing to a budget.