Running a Personal AI Agent for $0.69/Day with DeepSeek V4 Flash

Melvin Vivas · X post · 2026-07-08 · Open on X

Topics: LLMOps, Deployment & Monitoring, AI Agents, Tool Use & MCP · Level: intermediate

Summary

A real cost figure: one day of running DeepSeek V4 Flash through OpenRouter as the main agent model in Hermes cost $0.692. It was used for personal-assistant tasks, not coding. Cheap, fast models can make an always-on personal agent very affordable.

Key points

• One day of use cost $0.692.
• Model: DeepSeek V4 Flash, accessed through OpenRouter.
• Used as the main agent model in Hermes for personal-AI tasks, not coding.
• Routing a cheap 'flash' model through a gateway like OpenRouter keeps daily agent costs low.

Resources mentioned

• OpenRouter · tool · openrouter.ai · free
  A single OpenAI-compatible API that routes requests to hundreds of models from many providers, with one bill and model fallbacks.
  Also in: Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), The Jev model is now on OpenRouter (Melvin Vivas on X · notes), Kev-4B model, an alternative to Jev, now available on OpenRouter (Melvin Vivas on X · notes), Space Bunny Alpha: stealth 1M-context flash model on OpenRouter (Melvin Vivas on X · notes) and 42 more
• DeepSeek V4 Flash · tool · huggingface.co · free
  DeepSeek model used as the comparison baseline in the tool-calling benchmark.
  Also in: Low-Cost Agent Run: DeepSeek V4 Flash via OpenRouter in ohmypi (Melvin Vivas on X · notes), Running Codex with DeepSeek V4 Flash through OpenRouter (Melvin Vivas on X · notes), LFM2.5-2.6B Matches DeepSeek-V4-Flash on Tool Calling; LEAP Fine-Tuning (Melvin Vivas on X · notes), DeepSeek V4 Flash at 90% Off on Nous Portal (Melvin Vivas on X · notes) and 3 more
• Hermes · tool · hermes-agent.nousresearch.com · free
  The AI agent the creator uses to automate making explainer videos. It is probably Nous Research's Hermes Agent, but the post does not say so.
  Also in: OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes), Coworker: free open-source desktop AI coworker app (Melvin Vivas on X · notes), Agent Monitor: see traces, tokens and costs of your coding agents (Melvin Vivas on X · notes), Coworker: An Open-Source Desktop Agent App for Local and Cloud Models (Melvin Vivas on X · notes) and 13 more

Try this

• Set up a personal AI assistant agent that runs on a cheap model through OpenRouter, and track its daily cost.