Getting Started with DeepSeek Harness and the DeepSeek API Platform
Melvin Vivas · X post · 2026-09-13 · Open on X
Topics: AI Dev Tools & Productivity, AI Agents, Tool Use & MCP · Level: beginner
Summary
The creator recommends trying DeepSeek Harness, DeepSeek's open-source agent harness. He bought credits on the official DeepSeek API platform to power it.
Key points
- DeepSeek Harness is open source on GitHub (deepseek-ai/deepseek-harness).
- Buy API credits on platform.deepseek.com to use the harness with DeepSeek models.
- Using the official API means pay-as-you-go pricing instead of a subscription.
Resources mentioned
- DeepSeek API · tool · platform.deepseek.com · paid
DeepSeek's official API platform for buying credits and managing API keys.
Also in: DeepSeek 4.1 Flash speed on the official API: about 325 tokens/s (Melvin Vivas on X · notes), DeepSeek-V4-Flash Official API Launches in Public Beta (Melvin Vivas on X · notes) - DeepSeek Harness · repo · github.com · free
Open-source (MIT) agent harness with plugins, a trajectory/event-stream view and support for any model.
Also in: DeepSeek Harness desktop app released for macOS and Windows (Melvin Vivas on X · notes), One-Shot Agent Management UI with DeepSeek Harness for $0.19 (Melvin Vivas on X · notes), DeepSeek Harness: Open-Source, Browser-Based Agent for DeepSeek V4.1 (Melvin Vivas on X · notes), DeepSeek harness: open-source agent with an inspectable trajectory view (Melvin Vivas on X · notes)
Try this
- Try DeepSeek Harness from its GitHub repo.
- Buy credits on platform.deepseek.com to get an API key.
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