Low-Cost Agent Run: DeepSeek V4 Flash via OpenRouter in ohmypi

Melvin Vivas · X post · 2026-08-31 · Open on X

Topics: LLMOps, Deployment & Monitoring, AI Dev Tools & Productivity, LLM Fundamentals · Level: intermediate

Summary

A cost data point: a coding agent session in ohmypi using DeepSeek V4 Flash through OpenRouter cost about $0.30. It shows that cheap open models served through a gateway can make agentic coding very affordable.

Key points

• DeepSeek V4 Flash through OpenRouter cost about $0.30 for the session.
• The agent harness used was ohmypi.
• OpenRouter works as a single gateway to many models, including low-cost ones.

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: 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), Qwen3.8-Max on the Frontend Code Arena cost-performance frontier (Melvin Vivas on X · notes) and 3 more
• ohmypi · tool · github.com · free
  A coding agent that lets you assign different models to different roles.
  Also in: Assign Different Models per Role in ohmypi (Like Hermes) (Melvin Vivas on X · notes)

Try this

• Try DeepSeek V4 Flash through OpenRouter in your agent harness to cut costs.